start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20251020
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Coupling effects of biochar and sediment microbial fuel cells on CH4 and CO2 emissions from straw-amended paddy soil
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Purpose The independent incorporation of biochar and sediment microbial fuel cells (SMFCs) into paddy soil has been shown to reduce methane (CH4) emissions. However, the application of rice straw into paddy soil enhances the availability of labile carbon that stimulates methanogen growth, counteracting the mitigation effects of both methods. This study, therefore, aimed to investigate the effect of coupling biochar and SMFC on CH4 and CO2 emissions from straw-amended paddy soil.<br>
Materials and methods Single chamber SMFC setups constructed using acrylic columns (height, 25 cm; inner diameter, 9 cm) with six treatments were established using soil amended with 0% (0BC), 1% (1BC), and 2% (2BC) biochar: with and without SMFC conditions. Stainless steel mesh (15 × 3 cm) and graphite felt (6 × 5 cm) were used as anode and cathode materials, respectively.<br>
Results Cumulative emission of CH4 in the 0BC treatment with SMFC was 39% less than in that without SMFC. Biochar addition and SMFC operation together further reduced CH4 emission by 57% and 60% in 1BC and 2BC treatments, respectively, compared to that in the 0BC treatment without SMFC operation. The relative abundance of microbial communities indicated methane-oxidizing bacteria were enriched in the presence of biochar and hydrogenotrophic Methanoregula were suppressed by SMFC operation. This suggested that SMFC mainly inhibited CH4 production by outcompeting hydrogenotrophic archaea.<br>
Conclusion The use of biochar made from leftover rice straw has an interactive effect on SMFC operation and both methods can be used to reduce CH4 emission from straw-amended paddy soil.
en-copyright=
kn-copyright=

en-aut-name=BekeleAdhena Tesfau
en-aut-sei=Bekele
en-aut-mei=Adhena Tesfau
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=MaedaMorihiro
en-aut-sei=Maeda
en-aut-mei=Morihiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NakaharaNozomi
en-aut-sei=Nakahara
en-aut-mei=Nozomi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=HashiguchiAyumi
en-aut-sei=Hashiguchi
en-aut-mei=Ayumi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=AkaoSatoshi
en-aut-sei=Akao
en-aut-mei=Satoshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=NakanoChiyu
en-aut-sei=Nakano
en-aut-mei=Chiyu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=

affil-num=1
en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=

affil-num=4
en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=

affil-num=5
en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=

affil-num=6
en-affil=Faculty of Science and Engineering, Doshisha University
kn-affil=

affil-num=7
en-affil=Department of Comprehensive Technical Solutions, Okayama University
kn-affil=

affil-num=8
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=
en-keyword=Electrogenesis
kn-keyword=Electrogenesis
en-keyword=Methane oxidation
kn-keyword=Methane oxidation
en-keyword=Pyrolysis
kn-keyword=Pyrolysis
en-keyword=Paddy field
kn-keyword=Paddy field
en-keyword=Methanogens
kn-keyword=Methanogens
END

start-ver=1.4
cd-journal=joma
no-vol=23
cd-vols=
no-issue=5
article-no=
start-page=234
end-page=249
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=2025
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Biochar-amended Sediment Microbial Fuel Cells for Water Quality Improvement in Intensive and Extensive Pond Drainages in Central Vietnam
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The use of nutrient-rich feed in shrimp farming in Central Vietnam has led to high nitrogen (N) and phosphorus (P) contents in the pond sediment. The objectives of the study were to assess the effectiveness of biochar-sediment microbial fuel cells (BC-SMFCs) in suppressing P and N release from two types of sediment in intensive (Int) and extensive (Ext) pond drainages in Central Vietnam. Single chamber SMFCs were set up and operated under open or closed-circuit (no SMFC or SMFC) conditions. Coconut shell biochar (BC) was amended to sediments at 1%. For Int-sediment, total phosphorus (TP) release was reduced by no BC-SMFCs through co-precipitation with Fe. On the other hand, BC-SMFCs did not suppress TP release because P was released from BC and organic matter decomposition was enhanced in the sediment. Application of BC enhanced organic N mineralization in the sediment. Nitrification and denitrification occurred in the overlying water, reducing mineral N concentrations. For Ext-sediment, BC addition and SMFC conditions did not affect TP and total nitrogen (TN) release because of low initial organic matter content, and less reductive condition. Our study suggested that the effect of SMFCs was masked by BC which released more P from Int-sediment to the water.
en-copyright=
kn-copyright=

en-aut-name=NguyenUyen Tu 
en-aut-sei=Nguyen
en-aut-mei=Uyen Tu 
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=MaedaMorihiro
en-aut-sei=Maeda
en-aut-mei=Morihiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=NakaharaNozomi
en-aut-sei=Nakahara
en-aut-mei=Nozomi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=PereraGamamada Liyanage Erandi Priyangika
en-aut-sei=Perera
en-aut-mei=Gamamada Liyanage Erandi Priyangika
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=NakanoChiyu
en-aut-sei=Nakano
en-aut-mei=Chiyu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=LeHuu Tien
en-aut-sei=Le
en-aut-mei=Huu Tien
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=

affil-num=4
en-affil=Department of Comprehensive Technical Solutions, Okayama University
kn-affil=

affil-num=5
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=6
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=7
en-affil=Department of Education, Science and Technology Quang Tri Branch, Hue University
kn-affil=

affil-num=8
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=
en-keyword=biochar
kn-keyword=biochar
en-keyword=Central Vietnam
kn-keyword=Central Vietnam
en-keyword=electricity generation
kn-keyword=electricity generation
en-keyword=redox potential
kn-keyword=redox potential
en-keyword=shrimp farming
kn-keyword=shrimp farming
END

start-ver=1.4
cd-journal=joma
no-vol=13
cd-vols=
no-issue=35
article-no=
start-page=28887
end-page=28895
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=2025
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Thermally polymerizable phthalocyanine realizes a metal–nitrogen-doped carbon material featuring a defined single-atom catalyst motif with CO2RR activity
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Metal–nitrogen-doped carbon materials (MNCs) exhibit good electrocatalytic performance owing to the intrinsic advantages of carbon-based materials and the presence of isolated and stabilized metal atoms coordinated by nitrogen sites. However, conventional high-temperature pyrolysis of precursor molecules make it difficult to control the coordination structure precisely. To address this issue, here we report a new synthesis strategy for MNCs. Specifically, we design and synthesize Ni-phthalocyanine functionalized with ethynyl groups as solid-state thermal polymerization points. After depositing the Ni-phthalocyanine precursor on a carbon support and performing a thermal treatment, the resultant carbon composite material features a Ni–N4 coordination structure derived from the precursor, and enhanced porosity. This material demonstrates high catalytic activity for the CO2 reduction reaction (CO2RR). Our synthetic approach is applicable to various precursor molecules and carbon supports, paving the way for the further development of MNC-based electrode catalysts.
en-copyright=
kn-copyright=

en-aut-name=SanoYuki
en-aut-sei=Sano
en-aut-mei=Yuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=NakajimaDaichi
en-aut-sei=Nakajima
en-aut-mei=Daichi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MannaBiplab
en-aut-sei=Manna
en-aut-mei=Biplab
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=ChidaKoki
en-aut-sei=Chida
en-aut-mei=Koki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=ToyodaRyojun
en-aut-sei=Toyoda
en-aut-mei=Ryojun
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=TakaishiShinya
en-aut-sei=Takaishi
en-aut-mei=Shinya
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=IwaseKazuyuki
en-aut-sei=Iwase
en-aut-mei=Kazuyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

en-aut-name=HaranoKoji
en-aut-sei=Harano
en-aut-mei=Koji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=9
ORCID=

en-aut-name=YoshiiTakeharu
en-aut-sei=Yoshii
en-aut-mei=Takeharu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=10
ORCID=

en-aut-name=SakamotoRyota
en-aut-sei=Sakamoto
en-aut-mei=Ryota
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=11
ORCID=

affil-num=1
en-affil=Department of Chemistry, Graduate School of Science, Tohoku University
kn-affil=

affil-num=2
en-affil=Department of Chemistry, Graduate School of Science, Tohoku University
kn-affil=

affil-num=3
en-affil=Center for Basic Research on Materials, National Institute for Materials Science
kn-affil=

affil-num=4
en-affil=Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
kn-affil=

affil-num=5
en-affil=Department of Chemistry, Graduate School of Science, Tohoku University
kn-affil=

affil-num=6
en-affil=Department of Chemistry, Graduate School of Science, Tohoku University
kn-affil=

affil-num=7
en-affil=Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
kn-affil=

affil-num=8
en-affil=Center for Basic Research on Materials, National Institute for Materials Science
kn-affil=

affil-num=9
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=10
en-affil=Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
kn-affil=

affil-num=11
en-affil=Department of Chemistry, Graduate School of Science, Tohoku University
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=243
cd-vols=
no-issue=
article-no=
start-page=120539
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=202508
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Organic solvent transport through reduced graphene oxide membranes with controlled oxygen content
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Recent advances in membranes based on 2-dimensional (2D) materials have enabled precise control over angstrom-scale pores, providing a unique platform for studying diverse mass transport mechanisms. In this work, we systematically investigate the transport of solvent vapors through 2D channels made of graphene oxide (GO) laminates with precisely controlled oxygen content. Using in-situ chemical reduction of GO with vitamin C, we fabricated reduced GO membranes (VRGMs) with oxygen content systematically decreased from 31.6 % (pristine GO) to 24.0 % (VRGM-maximum reduction). Vapor permeability measurements showed a distinct correlation between oxygen functional groups and solvent transport behaviour. Specifically, non-polar hexane exhibits 114 % of enhanced permeance through the reduced membranes with larger graphitic domains, while the permeance of water decreases by 55 %. With the support of density functional theory (DFT) simulations, we modelled the hydrogen-bond and dispersion complexes between the solvents and GO and calculated the complexation energies. The simulation results suggest that polar molecules interact with the oxygen functional groups of GO via a hydrogen-bond network, supporting in-plane transport. In contrast, van der Waals forces drive the transport of low-polarity solvents along the graphitic domains of the 2D channel in reduced GO membranes. Our findings provide potential strategies for future design of organic solvent nanofiltration membranes.
en-copyright=
kn-copyright=

en-aut-name=ChenHongzhe
en-aut-sei=Chen
en-aut-mei=Hongzhe
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=LinTongxi
en-aut-sei=Lin
en-aut-mei=Tongxi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=RamadhanZeno Rizqi
en-aut-sei=Ramadhan
en-aut-mei=Zeno Rizqi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=RawalAditya
en-aut-sei=Rawal
en-aut-mei=Aditya
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=KartonAmir
en-aut-sei=Karton
en-aut-mei=Amir
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=RenXiaojun
en-aut-sei=Ren
en-aut-mei=Xiaojun
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

en-aut-name=JoshiRakesh
en-aut-sei=Joshi
en-aut-mei=Rakesh
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=

affil-num=1
en-affil=School of Materials Science and Engineering, University of New South Wales Sydney
kn-affil=

affil-num=2
en-affil=School of Materials Science and Engineering, University of New South Wales Sydney
kn-affil=

affil-num=3
en-affil=Electron Microscope Unit, University of New South Wales
kn-affil=

affil-num=4
en-affil=Mark Wainwright Analytical Centre, University of New South Wales
kn-affil=

affil-num=5
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=6
en-affil=School of Science and Technology, University of New England
kn-affil=

affil-num=7
en-affil=School of Materials Science and Engineering, University of New South Wales Sydney
kn-affil=

affil-num=8
en-affil=School of Materials Science and Engineering, University of New South Wales Sydney
kn-affil=
en-keyword=Graphene oxide
kn-keyword=Graphene oxide
en-keyword=Organic solvent nanofiltration
kn-keyword=Organic solvent nanofiltration
END

start-ver=1.4
cd-journal=joma
no-vol=12
cd-vols=
no-issue=4
article-no=
start-page=045010
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20250911
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Covalent cross-linked graphene oxide aerogels for moisture adsorption
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Covalent cross-linking is an effective approach to enhance the hydrophilicity and water adsorption properties of graphene oxide (GO). We studied moisture absorption in GO cross-linked with poly(ethylene glycol) diamines. At relative humidity (RH) of 85%, the PEG-cross-linked GO exhibited a significantly enhanced water uptake capacity of 0.59 g of water per gram of GO (gg−1), compared to 0.37 for unmodified GO. This is attributed to the presence of alkoxy groups via cross-linking, resulting in the enhanced interaction between GO and water molecules. These findings highlight the potential of PEG-based covalent functionalisation for efficient moisture capture in GO-based materials.
en-copyright=
kn-copyright=

en-aut-name=CaoZhijian
en-aut-sei=Cao
en-aut-mei=Zhijian
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=RenXiaojun
en-aut-sei=Ren
en-aut-mei=Xiaojun
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=LinTongxi
en-aut-sei=Lin
en-aut-mei=Tongxi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=YoshimuraMasamichi
en-aut-sei=Yoshimura
en-aut-mei=Masamichi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=JoshiRakesh
en-aut-sei=Joshi
en-aut-mei=Rakesh
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

affil-num=1
en-affil=School of Materials Science and Engineering, University of New South Wales
kn-affil=

affil-num=2
en-affil=School of Materials Science and Engineering, University of New South Wales
kn-affil=

affil-num=3
en-affil=School of Materials Science and Engineering, University of New South Wales
kn-affil=

affil-num=4
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=5
en-affil=Graduate School of Engineering, Toyota Technological Institute
kn-affil=

affil-num=6
en-affil=School of Materials Science and Engineering, University of New South Wales
kn-affil=
en-keyword=graphene oxide (GO)
kn-keyword=graphene oxide (GO)
en-keyword=covalent cross-linking
kn-keyword=covalent cross-linking
en-keyword=poly(ethylene glycol) (PEG)
kn-keyword=poly(ethylene glycol) (PEG)
en-keyword=moisture adsorption
kn-keyword=moisture adsorption
en-keyword=hydrophilicity enhancement
kn-keyword=hydrophilicity enhancement
END

start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20250811
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=RNA Delivery Using a Graphene Oxide-Polyethylenimine Hybrid Inhibiting Myotube Differentiation
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Graphene oxide (GO) conjugated with short polyethylenimine (PEI) chains (GO-PEI) has been designed as a candidate nanocarrier for small interfering RNA (siRNA) delivery to mammalian cells based on the efficient interaction between the positively charged GO-based platform and the negatively charged siRNA. The function and efficiency of siRNA delivery using GO-PEI were compared to those using the positive control Lipofectamine RNAiMax by analyzing the differentiation to myotubes, and myogenin gene and protein expression in C2C12 cells. RNAiMax transfection induced cellularization and reduction of both myogenin gene and protein expression, suggesting that the differentiation of C2C12 cells was triggered by gene silencing. While GO-PEI also promoted cellularization, the myogenin gene expression remained comparable to scrambled controls, whereas the protein levels were higher than those observed with RNAiMax. Mechanistically, we attributed the reduced gene silencing efficiency of GO-PEI to a poor endosomal escape, despite strong siRNA complexation. This limitation was likely due to a low buffering capacity of GO-PEI, as a significant fraction of nitrogen atoms were already protonated, reducing the availability of free amines necessary for endosomal disruption. An appropriate chemical modification to enhance siRNA release from the endosomes is therefore essential for advancing the development of GO-based platforms as versatile and efficient nanocarriers in gene therapy applications.
en-copyright=
kn-copyright=

en-aut-name=MatsuuraKoji
en-aut-sei=Matsuura
en-aut-mei=Koji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=ReinaGiacomo
en-aut-sei=Reina
en-aut-mei=Giacomo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=GaoZhengfeng
en-aut-sei=Gao
en-aut-mei=Zhengfeng
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=BiancoAlberto
en-aut-sei=Bianco
en-aut-mei=Alberto
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

affil-num=1
en-affil=CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR3572, University of Strasbourg, ISIS
kn-affil=

affil-num=2
en-affil=CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR3572, University of Strasbourg, ISIS
kn-affil=

affil-num=3
en-affil=CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR3572, University of Strasbourg, ISIS
kn-affil=

affil-num=4
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=5
en-affil=CNRS, Immunology, Immunopathology and Therapeutic Chemistry, UPR3572, University of Strasbourg, ISIS
kn-affil=
en-keyword=graphene oxide
kn-keyword=graphene oxide
en-keyword=polyethylenimine
kn-keyword=polyethylenimine
en-keyword=myotubes
kn-keyword=myotubes
en-keyword=myogenin
kn-keyword=myogenin
en-keyword=small interfering RNA
kn-keyword=small interfering RNA
en-keyword=transfection
kn-keyword=transfection
END

start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=2500368
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20250629
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Integration of Cholesterol Oxidase‐Based Biosensors on a Smart Contact Lens for Wireless Cholesterol Monitoring from Tears
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Cholesterol plays a critical role in physiological functions, but elevated levels increase the risk of cardiovascular disease. Regular cholesterol monitoring is essential for elderly or obese individuals. Current methods, such as blood tests, are invasive, inconvenient, and require a professional operator. In contrast, tears, as an accessible body fluid, offer a promising alternative for noninvasive monitoring due to their correlation with blood cholesterol levels. Herein, a noninvasive approach for monitoring cholesterol levels in tears using a biosensor integrated into a smart contact lens is reported. The biosensor employs cholesterol oxidases as the biocatalyst, coupled with an osmium-based mediator, to detect cholesterol concentrations ranging from 0.1 mM to 1.2 mM in artificial tears. A key challenge is the extremely low cholesterol concentration in tears, which is addressed using a parity-time (P-T) symmetry-based magnetic resonance coupling system. This system enables wireless signal reading and achieves high sensitivity due to its high-quality (Q) factor, which can achieve a detection limit of 0.061 mM. This portable, high-sensitivity smart contact lens demonstrates significant potential as a wearable device for continuous, noninvasive cholesterol monitoring. The findings contribute to advancing tear-based diagnostic systems and highlight the scientific importance of utilizing tear biomarkers for health monitoring.
en-copyright=
kn-copyright=

en-aut-name=CuiYang
en-aut-sei=Cui
en-aut-mei=Yang
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=ZhuoLin
en-aut-sei=Zhuo
en-aut-mei=Lin
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=AzhariSaman
en-aut-sei=Azhari
en-aut-mei=Saman
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=MiyakeTakeo
en-aut-sei=Miyake
en-aut-mei=Takeo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

affil-num=1
en-affil=Graduate school of Information, Production and Systems, Waseda University
kn-affil=

affil-num=2
en-affil=Graduate school of Information, Production and Systems, Waseda University
kn-affil=

affil-num=3
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=4
en-affil=Graduate school of Information, Production and Systems, Waseda University
kn-affil=

affil-num=5
en-affil=Graduate school of Information, Production and Systems, Waseda University
kn-affil=
en-keyword=cholesterol
kn-keyword=cholesterol
en-keyword=magnetic resonance coupling
kn-keyword=magnetic resonance coupling
en-keyword=parity-time symmetry
kn-keyword=parity-time symmetry
en-keyword=smart contact lens
kn-keyword=smart contact lens
END

start-ver=1.4
cd-journal=joma
no-vol=287
cd-vols=
no-issue=
article-no=
start-page=117674
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20251101
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=A plant-insertable multi-enzyme biosensor for the real-time monitoring of stomatal sucrose uptake
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Monitoring sucrose transport in plants is essential for understanding plant physiology and improving agricultural practices, yet effective sensors for continuous and real-time in-vivo monitoring are lacking. In this study, we developed a plant-insertable sucrose sensor capable of real-time sucrose concentration monitoring and demonstrated its application as a useful tool for plant research by monitoring the sugar-translocating path from leaves to the lower portion of plants through the stem in living plants. The biosensor consists of a bilirubin oxidase-based biocathode and a needle-type bioanode integrating glucose oxidase, invertase, and mutarotase, with the two electrodes separated by an agarose gel for ionic connection. The sensor exhibits a sensitivity of 6.22 μA mM−1 cm−2, a limit of detection of 100 μM, a detection range up to 60 mM, and a response time of 90 s at 100 μM sucrose. Additionally, the sensor retained 86 % of its initial signal after 72 h of continuous measurement. Day-night monitoring from the biosensor inserted in strawberry guava (Psidium cattleianum) showed higher sucrose transport activity at night, following well the redistribution of photosynthetically produced sugars. In addition, by monitoring the forced translocation of sucrose dissolved in the stable isotopically labeled water, we demonstrated that a young seedling of Japanese cedar known as Sugi (Cryptomeria japonica) can absorb and transport both water and sucrose through light-dependently opened stomata, which is the recently revealed path for liquid uptake by higher plants. These findings highlight the potential of our sensor for studying dynamic plant processes and its applicability in real-time monitoring of sugar transport under diverse environmental conditions.
en-copyright=
kn-copyright=

en-aut-name=WuShiqi
en-aut-sei=Wu
en-aut-mei=Shiqi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=NakagawaWakutaka
en-aut-sei=Nakagawa
en-aut-mei=Wakutaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MoriYuki
en-aut-sei=Mori
en-aut-mei=Yuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=AzhariSaman
en-aut-sei=Azhari
en-aut-mei=Saman
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=MéhesGábor
en-aut-sei=Méhes
en-aut-mei=Gábor
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=KawanoTomonori
en-aut-sei=Kawano
en-aut-mei=Tomonori
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

en-aut-name=MiyakeTakeo
en-aut-sei=Miyake
en-aut-mei=Takeo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=

affil-num=1
en-affil=Graduate School of Information, Production and Systems, Waseda University
kn-affil=

affil-num=2
en-affil=Graduate School of Information, Production and Systems, Waseda University
kn-affil=

affil-num=3
en-affil=Faculty and Graduate School of Environmental Engineering, The University of Kitakyushu
kn-affil=

affil-num=4
en-affil=Graduate School of Information, Production and Systems, Waseda University
kn-affil=

affil-num=5
en-affil=Graduate School of Information, Production and Systems, Waseda University
kn-affil=

affil-num=6
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=7
en-affil=Faculty and Graduate School of Environmental Engineering, The University of Kitakyushu
kn-affil=

affil-num=8
en-affil=Graduate School of Information, Production and Systems, Waseda University
kn-affil=
en-keyword=Flexible wearable sensor
kn-keyword=Flexible wearable sensor
en-keyword=Plant monitoring
kn-keyword=Plant monitoring
en-keyword=Carbon fiber
kn-keyword=Carbon fiber
en-keyword=Multi-enzyme system
kn-keyword=Multi-enzyme system
END

start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=2503029
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20250601
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Polyglycerol‐Grafted Graphene Oxide with pH‐Responsive Charge‐Convertible Surface to Dynamically Control the Nanobiointeractions for Enhanced in Vivo Tumor Internalization
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=pH-responsive charge-convertible nanomaterials (NMs) ameliorate the treatment of cancer via simultaneously reducing nonspecific interactions during systemic circulation and improving targeted uptake within solid tumors. While promising, little is known about how the pH-responsiveness of charge-convertible NMs directs their interactions with biological systems, leading to compromised performance, including off-target retention and low specificity to tumor cells. In the present study, polyglycerol-grafted graphene oxide bearing amino groups (GOPGNH2) at different densities are reacted with dimethylmaleic anhydride (DMMA), a pH-responsive moiety, to generate a set of charge-convertible GOPGNH-DMMA variants. This permits the assessment of a quantitative correlation between the structure of GOPGNH-DMMA to their pH-responsiveness, their dynamic interactions with proteins and cells, as well as their in vivo biological fate. Through a systematic investigation, it is revealed that GOPGNH115-DMMA prepared from GOPGNH2 with higher amine density experienced fast charge conversion at pH 7.4 to induce non-specific interactions at early stages, whereas GOPGNH60-DMMA and GOPGNH30-DMMA prepared from lower amine density retarded off-target charge conversion to enhance tumor accumulation. Notably, GOPGNH60-DMMA is also associated with enough amounts of proteins under acidic conditions to promote in vivo tumor internalization. The findings will inform the design of pH-responsive NMs for enhanced treatment accuracy and efficacy.
en-copyright=
kn-copyright=

en-aut-name=ZouYajuan
en-aut-sei=Zou
en-aut-mei=Yajuan
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=BiancoAlberto
en-aut-sei=Bianco
en-aut-mei=Alberto
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=2
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=3
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=
en-keyword=charge conversion
kn-keyword=charge conversion
en-keyword=in vivo tumor internalization
kn-keyword=in vivo tumor internalization
en-keyword=non-specific interaction
kn-keyword=non-specific interaction
en-keyword=pH-responsiveness
kn-keyword=pH-responsiveness
en-keyword=polyglycerol-grafted graphene oxide
kn-keyword=polyglycerol-grafted graphene oxide
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=10
article-no=
start-page=2401783
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=20241010
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Biocompatibility of Water-Dispersible Pristine Graphene and Graphene Oxide Using a Close-to-Human Animal Model: A Pilot Study on Swine
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Graphene-based materials (GBMs) are of considerable interest for biomedical applications, and the pilot study on the toxicological and immunological impact of pristine graphene (GR) and graphene oxide (GO) using swine as a close-to-human provides valuable insights. First, ex vivo experiments are conducted on swine blood cells, then GBMs are injected intraperitoneally (i.p.) into swine. Hematological and biochemical analyses at various intervals indicate that neither GO nor GR cause systemic inflammation, pro-coagulant responses, or renal or hepatic dysfunction. Importantly, no systemic toxicity is observed. Analysis of a panel of 84 immune-related genes shows minimal impact of GO and GR. The animals are sacrificed 21 days post-injection, and transient absorption imaging and Raman mapping show the presence of GO and GR in the mesentery only. Histological evaluation reveals no signs of alterations in other organs. Thus, clusters of both materials are detected in the mesentery, and GO aggregates are surrounded only by macrophages with the formation of granulomas. In contrast, modest local reactions are observed around the GR clusters. Overall, these results reveal that i.p. injection of GBMs resulted in a modest local tissue reaction without systemic toxicity. This study, performed in swine, provides essential guidance for future biomedical applications of graphene.
en-copyright=
kn-copyright=

en-aut-name=NicolussiPaola
en-aut-sei=Nicolussi
en-aut-mei=Paola
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=PiloGiovannantonio
en-aut-sei=Pilo
en-aut-mei=Giovannantonio
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=CanceddaMaria Giovanna
en-aut-sei=Cancedda
en-aut-mei=Maria Giovanna
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=PengGuotao
en-aut-sei=Peng
en-aut-mei=Guotao
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=ChauNgoc Do Quyen
en-aut-sei=Chau
en-aut-mei=Ngoc Do Quyen
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=De la CadenaAlejandro
en-aut-sei=De la Cadena
en-aut-mei=Alejandro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=VannaRenzo
en-aut-sei=Vanna
en-aut-mei=Renzo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

en-aut-name=SamadYarjan Abdul
en-aut-sei=Samad
en-aut-mei=Yarjan Abdul
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=

en-aut-name=AhmedTanweer
en-aut-sei=Ahmed
en-aut-mei=Tanweer
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=9
ORCID=

en-aut-name=MarcellinoJeremia
en-aut-sei=Marcellino
en-aut-mei=Jeremia
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=10
ORCID=

en-aut-name=TeddeGiuseppe
en-aut-sei=Tedde
en-aut-mei=Giuseppe
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=11
ORCID=

en-aut-name=GiroLinda
en-aut-sei=Giro
en-aut-mei=Linda
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=12
ORCID=

en-aut-name=YlmazerAcelya
en-aut-sei=Ylmazer
en-aut-mei=Acelya
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=13
ORCID=

en-aut-name=LoiFederica
en-aut-sei=Loi
en-aut-mei=Federica
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=14
ORCID=

en-aut-name=CartaGavina
en-aut-sei=Carta
en-aut-mei=Gavina
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=15
ORCID=

en-aut-name=SecchiLoredana
en-aut-sei=Secchi
en-aut-mei=Loredana
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=16
ORCID=

en-aut-name=Dei GiudiciSilvia
en-aut-sei=Dei Giudici
en-aut-mei=Silvia
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=17
ORCID=

en-aut-name=MacciocuSimona
en-aut-sei=Macciocu
en-aut-mei=Simona
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=18
ORCID=

en-aut-name=PolliDario
en-aut-sei=Polli
en-aut-mei=Dario
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=19
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=20
ORCID=

en-aut-name=LigiosCiriaco
en-aut-sei=Ligios
en-aut-mei=Ciriaco
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=21
ORCID=

en-aut-name=CerulloGiulio
en-aut-sei=Cerullo
en-aut-mei=Giulio
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=22
ORCID=

en-aut-name=FerrariAndrea
en-aut-sei=Ferrari
en-aut-mei=Andrea
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=23
ORCID=

en-aut-name=BiancoAlberto
en-aut-sei=Bianco
en-aut-mei=Alberto
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=24
ORCID=

en-aut-name=FadeelBengt
en-aut-sei=Fadeel
en-aut-mei=Bengt
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=25
ORCID=

en-aut-name=FranzoniGiulia
en-aut-sei=Franzoni
en-aut-mei=Giulia
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=26
ORCID=

en-aut-name=DeloguLucia Gemma
en-aut-sei=Delogu
en-aut-mei=Lucia Gemma
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=27
ORCID=

affil-num=1
en-affil=Istituto Zooprofilattico Sperimentale della Sardegna
kn-affil=

affil-num=2
en-affil=Istituto Zooprofilattico Sperimentale della Sardegna
kn-affil=

affil-num=3
en-affil=Istituto Zooprofilattico Sperimentale della Sardegna
kn-affil=

affil-num=4
en-affil=Institute of Environmental Medicine, Karolinska Institutet
kn-affil=

affil-num=5
en-affil=CNRS, Immunology, Immunopathology and Therapeutic Chemistry
kn-affil=

affil-num=6
en-affil=Dipartimento di Fisica, Politecnico di Milano
kn-affil=

affil-num=7
en-affil=Istituto di Fotonica e Nanotecnologie – CNR
kn-affil=

affil-num=8
en-affil=Cambridge Graphene Centre, University of Cambridge
kn-affil=

affil-num=9
en-affil=Cambridge Graphene Centre, University of Cambridge
kn-affil=

affil-num=10
en-affil=Cambridge Graphene Centre, University of Cambridge
kn-affil=

affil-num=11
en-affil=Istituto Zooprofilattico Sperimentale della Sardegna
kn-affil=

affil-num=12
en-affil=ImmuneNano Laboratory, Department of Biomedical Sciences
kn-affil=

affil-num=13
en-affil=Department of Biomedical Engineering, Ankara University
kn-affil=

affil-num=14
en-affil=Istituto Zooprofilattico Sperimentale della Sardegna
kn-affil=

affil-num=15
en-affil=Istituto Zooprofilattico Sperimentale della Sardegna
kn-affil=

affil-num=16
en-affil=Istituto Zooprofilattico Sperimentale della Sardegna
kn-affil=

affil-num=17
en-affil=Istituto Zooprofilattico Sperimentale della Sardegna
kn-affil=

affil-num=18
en-affil=Istituto Zooprofilattico Sperimentale della Sardegna
kn-affil=

affil-num=19
en-affil=Dipartimento di Fisica, Politecnico di Milano
kn-affil=

affil-num=20
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=21
en-affil=Istituto Zooprofilattico Sperimentale della Sardegna
kn-affil=

affil-num=22
en-affil=Dipartimento di Fisica, Politecnico di Milano
kn-affil=

affil-num=23
en-affil=Cambridge Graphene Centre, University of Cambridge
kn-affil=

affil-num=24
en-affil=CNRS, Immunology, Immunopathology and Therapeutic Chemistry
kn-affil=

affil-num=25
en-affil=Institute of Environmental Medicine, Karolinska Institutet
kn-affil=

affil-num=26
en-affil=Istituto Zooprofilattico Sperimentale della Sardegna
kn-affil=

affil-num=27
en-affil=ImmuneNano Laboratory, Department of Biomedical Sciences
kn-affil=
en-keyword=2D materials
kn-keyword=2D materials
en-keyword=biocompatibility
kn-keyword=biocompatibility
en-keyword=immune system
kn-keyword=immune system
en-keyword=porcine model
kn-keyword=porcine model
en-keyword=toxicity
kn-keyword=toxicity
END

start-ver=1.4
cd-journal=joma
no-vol=4
cd-vols=
no-issue=4
article-no=
start-page=263
end-page=272
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=20240607
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Light-Responsive and Antibacterial Graphenic Materials as a Holistic Approach to Tissue Engineering
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=While the continuous development of advanced bioprinting technologies is under fervent study, enhancing the regenerative potential of hydrogel-based constructs using external stimuli for wound dressing has yet to be tackled. Fibroblasts play a significant role in wound healing and tissue implants at different stages, including extracellular matrix production, collagen synthesis, and wound and tissue remodeling. This study explores the synergistic interplay between photothermal activity and nanomaterial-mediated cell proliferation. The use of different graphene-based materials (GBM) in the development of photoactive bioinks is investigated. In particular, we report the creation of a skin-inspired dressing for wound healing and regenerative medicine. Three distinct GBM, namely, graphene oxide (GO), reduced graphene oxide (rGO), and graphene platelets (GP), were rigorously characterized, and their photothermal capabilities were elucidated. Our investigations revealed that rGO exhibited the highest photothermal efficiency and antibacterial properties when irradiated, even at a concentration as low as 0.05 mg/mL, without compromising human fibroblast viability. Alginate-based bioinks alongside human fibroblasts were employed for the bioprinting with rGO. The scaffold did not affect the survival of fibroblasts for 3 days after bioprinting, as cell viability was not affected. Remarkably, the inclusion of rGO did not compromise the printability of the hydrogel, ensuring the successful fabrication of complex constructs. Furthermore, the presence of rGO in the final scaffold continued to provide the benefits of photothermal antimicrobial therapy without detrimentally affecting fibroblast growth. This outcome underscores the potential of rGO-enhanced hydrogels in tissue engineering and regenerative medicine applications. Our findings hold promise for developing game-changer strategies in 4D bioprinting to create smart and functional tissue constructs with high fibroblast proliferation and promising therapeutic capabilities in drug delivery and bactericidal skin-inspired dressings.
en-copyright=
kn-copyright=

en-aut-name=FerrerasAndrea
en-aut-sei=Ferreras
en-aut-mei=Andrea
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=MatesanzAna
en-aut-sei=Matesanz
en-aut-mei=Ana
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MendizabalJabier
en-aut-sei=Mendizabal
en-aut-mei=Jabier
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=ArtolaKoldo
en-aut-sei=Artola
en-aut-mei=Koldo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=AcedoPablo
en-aut-sei=Acedo
en-aut-mei=Pablo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=JorcanoJosé L.
en-aut-sei=Jorcano
en-aut-mei=José L.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

en-aut-name=RuizAmalia
en-aut-sei=Ruiz
en-aut-mei=Amalia
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=

en-aut-name=ReinaGiacomo
en-aut-sei=Reina
en-aut-mei=Giacomo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=9
ORCID=

en-aut-name=MartínCristina
en-aut-sei=Martín
en-aut-mei=Cristina
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=10
ORCID=

affil-num=1
en-affil=Department of Bioengineering, Universidad Carlos III de Madrid
kn-affil=

affil-num=2
en-affil=Department of Electronic Technology, Universidad Carlos III de Madrid
kn-affil=

affil-num=3
en-affil=Domotek ingeniería prototipado y formación S.L.
kn-affil=

affil-num=4
en-affil=Domotek ingeniería prototipado y formación S.L.
kn-affil=

affil-num=5
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=6
en-affil=Department of Electronic Technology, Universidad Carlos III de Madrid
kn-affil=

affil-num=7
en-affil=Department of Bioengineering, Universidad Carlos III de Madrid
kn-affil=

affil-num=8
en-affil=Institute of Cancer Therapeutics, School of Pharmacy and Medical Sciences, Faculty of Life Sciences, University of Bradford
kn-affil=

affil-num=9
en-affil=Empa Swiss Federal Laboratories for Materials Science and Technology
kn-affil=

affil-num=10
en-affil=Department of Bioengineering, Universidad Carlos III de Madrid
kn-affil=
en-keyword=photothermal therapy
kn-keyword=photothermal therapy
en-keyword=graphene derivatives
kn-keyword=graphene derivatives
en-keyword=4D bioprinting
kn-keyword=4D bioprinting
en-keyword=alginate
kn-keyword=alginate
en-keyword=tissue engineering
kn-keyword=tissue engineering
END

start-ver=1.4
cd-journal=joma
no-vol=22
cd-vols=
no-issue=6
article-no=
start-page=271
end-page=285
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=2024
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Effects of Sediment Microbial Fuel Cells on CH4 and CO2 Emissions from Straw Amended Paddy Soil
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Straw returning into paddy soil enhances soil organic matter which usually promotes the emission of greenhouse gases to the atmosphere. The application of sediment microbial fuel cells (SMFCs) to paddy soil activates power-generating microorganisms and enhances organic matter biodegradation. In the present study, rice straw addition in SMFCs was examined to determine its effect on CH4 and CO2 emissions. Columns (height, 25 cm; inner diameter, 9 cm) with four treatments: soil without and with rice straw under SMFC and without SMFC conditions were incubated at 25°C for 70 days. Anodic potential values at 7 cm depth sediment were kept higher by SMFCs than those without SMFCs. Cumulative CH4 emission was significantly reduced by SMFC with straw amendment (p < 0.05) with no significant effect on CO2 emission. 16S rRNA gene analysis results showed that Firmicutes at the phylum, Closteridiales and Acidobacteriales at order level were dominant on the anode of straw-added SMFC, whereas Methanomicrobiales were in the treatment without SMFC, indicating that a certain group of methanogens were suppressed by SMFC. Our results suggest that the anodic redox environment together with the enrichment of straw-degrading bacteria contributed to a competitive advantage of electrogenesis over methanogenesis in straw-added SMFC system.
en-copyright=
kn-copyright=

en-aut-name=BekeleAdhena Tesfau
en-aut-sei=Bekele
en-aut-mei=Adhena Tesfau
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=MaedaMorihiro
en-aut-sei=Maeda
en-aut-mei=Morihiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=AkaoSatoshi
en-aut-sei=Akao
en-aut-mei=Satoshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=SomuraHiroaki
en-aut-sei=Somura
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=NakanoChiyu
en-aut-sei=Nakano
en-aut-mei=Chiyu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

affil-num=1
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=3
en-affil=Faculty of Science and Engineering, Doshisha University
kn-affil=

affil-num=4
en-affil=Graduate School of Environmental and Life Science, Okayama University
kn-affil=

affil-num=5
en-affil=Organization for Research Strategy and Development, Okayama University
kn-affil=

affil-num=6
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=
en-keyword=straw
kn-keyword=straw
en-keyword=methane mitigation
kn-keyword=methane mitigation
en-keyword=SMFC
kn-keyword=SMFC
en-keyword=microorganisms
kn-keyword=microorganisms
en-keyword=current generation
kn-keyword=current generation
END

start-ver=1.4
cd-journal=joma
no-vol=9
cd-vols=
no-issue=34
article-no=
start-page=36114
end-page=36121
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=20240812
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Engineering Zeolitic-Imidazolate-Framework-Derived Mo-Doped Cobalt Phosphide for Efficient OER Catalysts
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Designing a cheap, competent, and durable catalyst for the oxygen evolution reaction (OER) is exceedingly necessary for generating oxygen through a water-splitting reaction. In this project, we have designed a ZIF-67-originated molybdenum-doped cobalt phosphide (CoP) using a simplistic dissolution–regrowth method using Na2MoO4 and a subsequent phosphidation process. This leads to the formation of an exceptional hollow nanocage morphology that is useful for enhanced catalytic activity. Metal–organic frameworks, especially ZIF-67, can be used both as a template and as a metal (cobalt) precursor. Molybdenum-doped CoP was fabricated through a two-step synthesis process, and the fabricated Mo-doped CoP showed excellent catalytic activity during the OER with a lower value of overpotential. Furthermore, the effect of the Mo amount on the catalytic activity has been explored. The best catalyst (CoMoP-2) showed an onset potential of around 1.49 V at 10 mA cm–2 to give rise to a Tafel slope of 62.1 mV dec–1. The improved catalytic activity can be attributed to the increased porosity and surface area of the resultant catalyst.
en-copyright=
kn-copyright=

en-aut-name=RahmanMohammad Atiqur
en-aut-sei=Rahman
en-aut-mei=Mohammad Atiqur
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=CaiZe
en-aut-sei=Cai
en-aut-mei=Ze
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MoushumyZannatul Mumtarin
en-aut-sei=Moushumy
en-aut-mei=Zannatul Mumtarin
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=TagawaRyuta
en-aut-sei=Tagawa
en-aut-mei=Ryuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=HidakaYoshiharu
en-aut-sei=Hidaka
en-aut-mei=Yoshiharu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=NakanoChiyu
en-aut-sei=Nakano
en-aut-mei=Chiyu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=IslamMd. Saidul
en-aut-sei=Islam
en-aut-mei=Md. Saidul
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

en-aut-name=SekineYoshihiro
en-aut-sei=Sekine
en-aut-mei=Yoshihiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=9
ORCID=

en-aut-name=IdaShintaro
en-aut-sei=Ida
en-aut-mei=Shintaro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=10
ORCID=

en-aut-name=HayamiShinya
en-aut-sei=Hayami
en-aut-mei=Shinya
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=11
ORCID=

affil-num=1
en-affil=Department of Chemistry, Graduate School of Science and Technology, Kumamoto University
kn-affil=

affil-num=2
en-affil=Department of Chemistry, Graduate School of Science and Technology, Kumamoto University
kn-affil=

affil-num=3
en-affil=Department of Applied Chemistry and Biochemistry, Graduate School of Science and Technology, Kumamoto University
kn-affil=

affil-num=4
en-affil=Department of Chemistry, Graduate School of Science and Technology, Kumamoto University
kn-affil=

affil-num=5
en-affil=Department of Chemistry, Graduate School of Science and Technology, Kumamoto University
kn-affil=

affil-num=6
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=7
en-affil=Department of Chemistry, Graduate School of Science and Technology, Kumamoto University
kn-affil=

affil-num=8
en-affil=Department of Chemistry, Graduate School of Science and Technology, Kumamoto University
kn-affil=

affil-num=9
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=10
en-affil=Institute of Industrial Nanomaterials (IINa), Kumamoto University
kn-affil=

affil-num=11
en-affil=Institute of Industrial Nanomaterials (IINa), Kumamoto University
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=238
cd-vols=
no-issue=
article-no=
start-page=120296
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20250505
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Grafting-through functionalization of graphene oxide with cationic polymers for enhanced adsorption of anionic dyes and viruses
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Graphene oxide (GO) is a sheet-like carbon material with abundant oxygen-containing functional groups on its surface. GO has been extensively studied as an adsorbent for heavy metals and organic compounds. However, effective strategies for negatively charged materials have yet to be established. This study aimed to synthesize composites of GO and cationic polymers for the selective adsorption of negatively charged materials; a challenge in this approach is the strong electrostatic interactions between GO and cationic polymers, which can lead to aggregation. This study addresses this issue by employing the grafting-through method. GO was initially modified with allylamine to introduce a polymerizable site, followed by radical polymerization to covalently bond polymers to the GO surface, effectively preventing aggregation. Adsorption experiments demonstrated that the GO-polymer composite selectively adsorbs anionic dye, such as methyl orange. Virus adsorption tests showed significantly enhanced performance compared to pristine GO. These results emphasize the critical role of controlled surface modification and charge manipulation in optimizing the adsorption performance of GO. This study establishes a simple and effective approach for synthesizing GO-cationic polymer composites, contributing to the development of advanced materials for water purification applications.
en-copyright=
kn-copyright=

en-aut-name=KimuraRyota
en-aut-sei=Kimura
en-aut-mei=Ryota
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=Ferré-PujolPilar
en-aut-sei=Ferré-Pujol
en-aut-mei=Pilar
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=
en-keyword=Graphene oxide
kn-keyword=Graphene oxide
en-keyword=Virus adsorption
kn-keyword=Virus adsorption
en-keyword=Dye adsorption
kn-keyword=Dye adsorption
en-keyword=Cationic polymer composites
kn-keyword=Cationic polymer composites
en-keyword=Adsorbent
kn-keyword=Adsorbent
en-keyword=Aggregation
kn-keyword=Aggregation
END

start-ver=1.4
cd-journal=joma
no-vol=60
cd-vols=
no-issue=76
article-no=
start-page=10544
end-page=10547
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=2024
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Investigating the radical properties of oxidized carbon materials under photo-irradiation: behavior of carbon radicals and their application in catalytic reactions
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Oxidized carbon materials have abundant surface functional groups and customizable properties, making them an excellent platform for generating radicals. Unlike reactive oxygen species such as hydroxide or superoxide radicals that have been reported previously, oxidized carbon also produces stable carbon radicals under photo-irradiation. This has been confirmed through electron spin resonance. Among the various oxidized carbon materials synthesized, graphene oxide shows the largest number of carbon radicals when exposed to blue LED light. The light absorption capacity, high surface area, and unique structural characteristics of oxidized carbon materials offer a unique function for radical-mediated oxidative reactions.
en-copyright=
kn-copyright=

en-aut-name=AhmedMd Razu
en-aut-sei=Ahmed
en-aut-mei=Md Razu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=AnayaIsrael Ortiz
en-aut-sei=Anaya
en-aut-mei=Israel Ortiz
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=2
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=3
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=695
cd-vols=
no-issue=
article-no=
start-page=137727
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=202510
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Tunable interlayer distance in graphene oxide through alkylamine surface coverage and chain length
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Layered materials have unique structures that can be modified by adjusting the space between layers through pillaring or surface functionalization. Unlike typical crystalline layered materials, graphene oxide (GO) possesses reactive oxygenated functional groups, which lead to spontaneous reduction and stacking upon thermal treatment. Here, we investigated the functionalization of GO with different amounts of hexylamine to control the degree of surface coverage. Furthermore, octylamine and dodecylamine were employed to confirm the effect of the alkyl chain length on the interlayer distance of the resultant GO derivatives. Subsequent thermal treatment produced reduced GO (rGO) functionalized with alkylamines, demonstrating the retention of the interlayer distance. Additionally, amine-functionalized rGOs exhibited varying porous structures.
en-copyright=
kn-copyright=

en-aut-name=Ortiz-AnayaIsrael
en-aut-sei=Ortiz-Anaya
en-aut-mei=Israel
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=ObataSeiji
en-aut-sei=Obata
en-aut-mei=Seiji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Graduate School of Natural Sciences and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=3
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=
en-keyword=Graphene oxide
kn-keyword=Graphene oxide
en-keyword=Layered material
kn-keyword=Layered material
en-keyword=Interlayer distance
kn-keyword=Interlayer distance
en-keyword=Functionalization
kn-keyword=Functionalization
en-keyword=Alkylamines
kn-keyword=Alkylamines
en-keyword=Nitrogen physisorption
kn-keyword=Nitrogen physisorption
END

start-ver=1.4
cd-journal=joma
no-vol=234
cd-vols=
no-issue=
article-no=
start-page=120015
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20250305
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Reversible chemical modifications of graphene oxide for enhanced viral capture and release in water
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Detecting low concentrations of viruses in sewage water is crucial for monitoring the spread of emerging viral diseases. However, current detection methods, which involve concentrating viruses using traditional materials such as gauze or cotton, have limitations in effectively accomplishing this task. This study demonstrates that graphene oxide (GO), a two-dimensional carbon material, possesses strong viral adsorption capabilities. However, it lacks efficiency for effective viral release. Therefore, we designed a series of new GO-based materials, which exhibited a viral adsorption similar to pristine GO, while significantly enhancing their release performance by attaching alkyl chains and hydrophilic functional groups. Among the synthesized materials, 1,8-aminooctanol grafted to GO (GO-NH2C8OH) has emerged as the most promising candidate, achieving a viral release rate higher than 50 %. This superior performance can be attributed to the synergistic effect of the alkyl chain and the terminal OH group, which enhances both its affinity for viruses and water dispersibility. Furthermore, we have successfully applied GO-NH2C8OH in a new protocol for concentrating viruses from sewage wastewater. This approach has demonstrated a 200-fold increase in virus concentration, allowing PCR detection of this type of pathogens present in wastewater below the detection limit by direct analysis, underscoring its significant potential for virus surveillance.
en-copyright=
kn-copyright=

en-aut-name=Ferré-PujolPilar
en-aut-sei=Ferré-Pujol
en-aut-mei=Pilar
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=ObataSeiji
en-aut-sei=Obata
en-aut-mei=Seiji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=RayaJésus
en-aut-sei=Raya
en-aut-mei=Jésus
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=BiancoAlberto
en-aut-sei=Bianco
en-aut-mei=Alberto
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=KatayamaHiroyuki
en-aut-sei=Katayama
en-aut-mei=Hiroyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=KatoTakashi
en-aut-sei=Kato
en-aut-mei=Takashi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

affil-num=1
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=2
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=3
en-affil=Institut de Chimie, UMR 7177 CNRS, Université de Strasbourg
kn-affil=

affil-num=4
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=5
en-affil=Department of Urban Engineering, School of Engineering, The University of Tokyo
kn-affil=

affil-num=6
en-affil=Research Center for Water Environment Technology, School of Engineering, The University of Tokyo
kn-affil=

affil-num=7
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=
en-keyword=Carbon nanomaterials
kn-keyword=Carbon nanomaterials
en-keyword=Functionalization
kn-keyword=Functionalization
en-keyword=Adsorption
kn-keyword=Adsorption
en-keyword=Desorption
kn-keyword=Desorption
en-keyword=Pathogens
kn-keyword=Pathogens
END

start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=e202404400
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20250107
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Graphene Oxide as a Self‐Carbocatalyst to Facilitate the Ring‐Opening Polymerization of Glycidol for Efficient Polyglycerol Grafting
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Grafting carbon-based nanomaterials (CNMs) with polyglycerol (PG) improves their application potentials in biomedicine and electronics. Although “grafting from” method offers advantages over “grafting to” one in terms of operability and versatility, little is known about the reaction process of glycidol with the surface groups onto CNMs. By using graphene oxide (GO) as a multi-functional model material, we examined the reactivity of the surface groups on GO toward glycidol molecules via a set of model reactions. We reveal that carboxyl groups spontaneously react with the epoxide ring with no need of catalyst, while GO catalyzes the reactions of hydroxyl groups with the epoxide of glycidol. In addition, the hydroxyl group of glycidol can open the epoxide in the basal plane of GO. The subsequent polymerization of PG is supposed to propagate at the primary and/or the secondary hydroxyl groups, generating a ramified PG macromolecule with random branch-on-branch topology. In addition, ketones, benzyl esters and aromatic ethers are found not to react with glycidol even in the presence of GO, while the aldehydes are easily oxidized into carboxyl groups under ambient condition, behaving then as the carboxyl groups. Our findings pose the foundation for understanding the polymerization mechanism of PG on CNMs.
en-copyright=
kn-copyright=

en-aut-name=ZouYajuan
en-aut-sei=Zou
en-aut-mei=Yajuan
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=OhkuraKentaro
en-aut-sei=Ohkura
en-aut-mei=Kentaro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=Ortiz‐AnayaIsrael
en-aut-sei=Ortiz‐Anaya
en-aut-mei=Israel
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=KimuraRyota
en-aut-sei=Kimura
en-aut-mei=Ryota
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=BiancoAlberto
en-aut-sei=Bianco
en-aut-mei=Alberto
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

affil-num=1
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=3
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=4
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=5
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=

affil-num=6
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=
en-keyword=Carbon nanomaterials
kn-keyword=Carbon nanomaterials
en-keyword=Epoxide ring-opening
kn-keyword=Epoxide ring-opening
en-keyword=Catalysis
kn-keyword=Catalysis
en-keyword=Polyglycerol functionalization
kn-keyword=Polyglycerol functionalization
END

start-ver=1.4
cd-journal=joma
no-vol=18
cd-vols=
no-issue=49
article-no=
start-page=33264
end-page=33275
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=20241122
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Mass Production of Graphene Oxide Beyond the Laboratory: Bridging the Gap Between Academic Research and Industry
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The mass production of graphene oxide (GO) has garnered significant attention in recent years due to its potential applications in various fields, from materials science to biomedicine. Graphene, known for its unique properties, such as high conductivity and mechanical strength, has been extensively studied. However, traditional production methods such as the exfoliation of graphite with scotch tape are not suitable for large-scale production. This has led to an increased focus on GO as a viable alternative to graphene production. Nonetheless, challenges, including the optimization of oxidation processes, the control of structural uniformity, and the reproducibility of production, have not been solved so far. This review critically examines GO production advancements by analyzing experimental and mechanistic studies to identify significant developments that enable high-yield and reproducible methods suitable for industrial-scale production. Special attention is given to oxidation techniques and postsynthesis purification and storage, with a focus on controlled oxidation to achieve homogeneous and single-layer GO. Through this lens, the review outlines the path forward for the industrialization of GO, aiming to bridge the gap between academic research and industrial production.
en-copyright=
kn-copyright=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

affil-num=1
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=
en-keyword=Graphene oxide
kn-keyword=Graphene oxide
en-keyword=Graphite
kn-keyword=Graphite
en-keyword=Chemical oxidation
kn-keyword=Chemical oxidation
en-keyword=Electrochemical oxidation
kn-keyword=Electrochemical oxidation
en-keyword=Mass production
kn-keyword=Mass production
en-keyword=Purification
kn-keyword=Purification
en-keyword=Optimization
kn-keyword=Optimization
en-keyword=Industrialization
kn-keyword=Industrialization
en-keyword=Safety
kn-keyword=Safety
en-keyword=Stability
kn-keyword=Stability
END

start-ver=1.4
cd-journal=joma
no-vol=97
cd-vols=
no-issue=11
article-no=
start-page=uoae118
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=20241111
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Refined surface area determination of graphene oxide using methylene blue as a probe molecule: a comparative approach
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In this research, we explored the effectiveness of the methylene blue adsorption method as an alternative approach for determining the specific surface area of graphene oxide. Initially, through a comparative analysis with reference activated carbon, we identified the limitations of utilizing N2 physisorption for specific surface area determination of graphene oxide. Our findings revealed that the standard pretreatment process (heating under vacuum) before N2 physisorption led to damage to the surface oxygen groups on graphene oxide, and the measured surface areas (43 m2/g) do not accurately represent the entire surface area. To optimize methylene blue coverage on graphene oxide, we conducted adsorption equilibrium experiments, focusing on controlling temperature and pH. The pH was significantly important in regulating the coverage of methylene blue. Under the optimized methylene blue adsorption conditions, the specific surface area of graphene oxide was 1,555 m2/g. Our assumptions regarding specific surface area calculations were supported by structural characterization of samples with varying methylene blue uptakes. The results confirmed a uniform coverage of methylene blue on graphene oxide by scanning electron microscopy and energy dispersive X-ray, X-ray diffraction, and atomic force microscopy.
en-copyright=
kn-copyright=

en-aut-name=Ortiz-AnayaIsrael
en-aut-sei=Ortiz-Anaya
en-aut-mei=Israel
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

affil-num=1
en-affil=Graduate School of Natural Sciences and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=
en-keyword=graphene oxide
kn-keyword=graphene oxide
en-keyword=methylene blue
kn-keyword=methylene blue
en-keyword=specific surface area
kn-keyword=specific surface area
END

start-ver=1.4
cd-journal=joma
no-vol=125
cd-vols=
no-issue=2
article-no=
start-page=023104
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=20240708
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Enhanced thermal conductivity of fluids by percolating high-concentration few-layer graphene
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=High-performance and small-sized heat exchangers have been demanded due to the miniaturization and higher output of electronic devices, lasers, and energy harvesting/storage systems. Graphene nanosheet suspension has attracted attention as a next-generation nanofluid because of its high thermal conductivity and low pressure drop, while being dispersed stably without any additives. Graphene-based nanofluids have been mostly investigated using graphene oxide, and there are a few studies on pure graphene because of the limitation in mass production and stabilization at high concentrations of graphene. In this study, we prepared a 10 wt. % high-concentration few-layer graphene suspension by pulverizing graphite particles. Scanning electron microscopy, atomic force microscopy, and Raman spectra confirmed the few-layer graphene is formed in the suspension. The thermal conductivity of the suspension increased with concentration and suddenly jumped at a specific concentration. Furthermore, a significant improvement in thermal conductivity of >40% compared to base liquid was confirmed at 10 wt. % graphene content. A similar trend was observed for electrical resistance; 10 wt. % graphene suspension showed 62% lower resistance than that of 1 wt. %. These results suggest the percolation of graphene in a liquid, which has not been observed for graphene-based materials in previous research.
en-copyright=
kn-copyright=

en-aut-name=IshiiKeiko
en-aut-sei=Ishii
en-aut-mei=Keiko
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=OgiyamaTakahiro
en-aut-sei=Ogiyama
en-aut-mei=Takahiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=FumotoKoji
en-aut-sei=Fumoto
en-aut-mei=Koji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=College of Science and Engineering, Chuo University
kn-affil=

affil-num=2
en-affil=College of Science and Engineering, Aoyama Gakuin University
kn-affil=

affil-num=3
en-affil=College of Science and Engineering, Aoyama Gakuin University
kn-affil=

affil-num=4
en-affil=Research Institute for Interdisciplinary Science, Okayama University
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=358
cd-vols=
no-issue=
article-no=
start-page=142060
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=202406
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Size, polyglycerol grafting, and net surface charge of iron oxide nanoparticles determine their interaction and toxicity in Caenorhabditis elegans
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The widespread application of engineered nanoparticles (NPs) in environmental remediation has raised public concerns about their toxicity to aquatic organisms. Although appropriate surface modification can mitigate the ecotoxicity of NPs, the lack of polymer coating to inhibit toxicity completely and the insufficient knowledge about charge effect hinder the development of safe nanomaterials. Herein, we explored the potential of polyglycerol (PG) functionalization in alleviating the environmental risks of NPs. Iron oxide NPs (ION) of 20, 100, and 200 nm sizes (IONS, IONM and IONL, respectively) were grafted with PG to afford ION-PG. We examined the interaction of ION and ION-PG with Caenorhabditis elegans (C. elegans) and found that PG suppressed non-specific interaction of ION with C. elegans to reduce their accumulation and to inhibit their translocation. Particularly, IONS-PG was completely excluded from worms of all developmental stages. By covalently introducing sulfate, carboxyl and amino groups onto IONS-PG, we further demonstrated that positively charged IONS-PG-NH3+ induced high intestinal accumulation, cuticle adhesion and distal translocation, whereas the negatively charged IONS-PG-OSO3– and IONS-PG-COO– were excreted out. Consequently, no apparent deleterious effects on brood size and life span were observed in worms treated by IONS-PG and IONS-PG bearing negatively charged groups. This study presents new surface functionalization approaches for developing ecofriendly nanomaterials.
en-copyright=
kn-copyright=

en-aut-name=ZouYajuan
en-aut-sei=Zou
en-aut-mei=Yajuan
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=ShikanoYutaka
en-aut-sei=Shikano
en-aut-mei=Yutaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=KomatsuNaoki
en-aut-sei=Komatsu
en-aut-mei=Naoki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=Kage-NakadaiEriko
en-aut-sei=Kage-Nakadai
en-aut-mei=Eriko
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=FujiwaraMasazumi
en-aut-sei=Fujiwara
en-aut-mei=Masazumi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

affil-num=1
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Institute of Systems and Information Engineering, University of Tsukuba
kn-affil=

affil-num=3
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=4
en-affil=Graduate School of Human and Environmental Studies, Kyoto University
kn-affil=

affil-num=5
en-affil=Department of Nutrition, Graduate School of Human Life and Ecology, Osaka Metropolitan University
kn-affil=

affil-num=6
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=
en-keyword=iron oxide nanoparticles
kn-keyword=iron oxide nanoparticles
en-keyword=polyglycerol functionalization
kn-keyword=polyglycerol functionalization
en-keyword=C. elegans
kn-keyword=C. elegans
en-keyword=accumulation
kn-keyword=accumulation
en-keyword=distribution
kn-keyword=distribution
en-keyword=toxicity
kn-keyword=toxicity
END

start-ver=1.4
cd-journal=joma
no-vol=59
cd-vols=
no-issue=17
article-no=
start-page=2425
end-page=2428
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2023
dt-pub=2023
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Non-enzymatic detection of glucose levels in human blood plasma by a graphene oxide-modified organic transistor sensor
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=We herein report an organic transistor functionalized with a phenylboronic acid derivative and graphene oxide for the quantification of plasma glucose levels, which has been achieved by the minimization of interferent effects derived from physical protein adsorption on the detection electrode.
en-copyright=
kn-copyright=

en-aut-name=FanHaonan
en-aut-sei=Fan
en-aut-mei=Haonan
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SasakiYui
en-aut-sei=Sasaki
en-aut-mei=Yui
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=ZhouQi
en-aut-sei=Zhou
en-aut-mei=Qi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=TangWei
en-aut-sei=Tang
en-aut-mei=Wei
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=MinamiTsuyoshi
en-aut-sei=Minami
en-aut-mei=Tsuyoshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

affil-num=1
en-affil=Institute of Industrial Science, The University of Tokyo
kn-affil=

affil-num=2
en-affil=Institute of Industrial Science, The University of Tokyo
kn-affil=

affil-num=3
en-affil=Institute of Industrial Science, The University of Tokyo
kn-affil=

affil-num=4
en-affil=Institute of Industrial Science, The University of Tokyo
kn-affil=

affil-num=5
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=6
en-affil=Institute of Industrial Science, The University of Tokyo
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=3
cd-vols=
no-issue=5
article-no=
start-page=394
end-page=405
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2023
dt-pub=20230911
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Highly Stretchable Stress-Strain Sensor from Elastomer Nanocomposites with Movable Cross-links and Ketjenblack
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Practical applications like very thin stress-strain sensors require high strength, stretchability, and conductivity, simultaneously. One of the approaches is improving the toughness of the stress-strain sensing materials. Polymeric materials with movable cross-links in which the polymer chain penetrates the cavity of cyclodextrin (CD) demonstrate enhanced strength and stretchability, simultaneously. We designed two approaches that utilize elastomer nanocomposites with movable cross-links and carbon filler (ketjenblack, KB). One approach is mixing SC (a single movable cross-network material), a linear polymer (poly(ethyl acrylate), PEA), and KB to obtain their composite. The electrical resistance increases proportionally with tensile strain, leading to the application of this composite as a stress- strain sensor. The responses of this material are stable for over 100 loading and unloading cycles. The other approach is a composite made with KB and a movable cross-network elastomer for knitting dissimilar polymers (KP), where movable cross-links connect the CD-modified polystyrene (PSCD) and PEA. The obtained composite acts as a highly sensitive stress-strain sensor that exhibits an exponential increase in resistance with increasing tensile strain due to the polymer dethreading from the CD rings. The designed preparations of highly repeatable or highly responsive stress-strain sensors with good mechanical properties can help broaden their application in electrical devices.
en-copyright=
kn-copyright=

en-aut-name=IkuraRyohei
en-aut-sei=Ikura
en-aut-mei=Ryohei
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=KajimotoKota
en-aut-sei=Kajimoto
en-aut-mei=Kota
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=ParkJunsu
en-aut-sei=Park
en-aut-mei=Junsu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=MurayamaShunsuke
en-aut-sei=Murayama
en-aut-mei=Shunsuke
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=FujiwaraYusei
en-aut-sei=Fujiwara
en-aut-mei=Yusei
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=OsakiMotofumi
en-aut-sei=Osaki
en-aut-mei=Motofumi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=SuzukiTomohiro
en-aut-sei=Suzuki
en-aut-mei=Tomohiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

en-aut-name=ShirakawaHidenori
en-aut-sei=Shirakawa
en-aut-mei=Hidenori
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=

en-aut-name=KitamuraYujiro
en-aut-sei=Kitamura
en-aut-mei=Yujiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=9
ORCID=

en-aut-name=TakahashiHiroaki
en-aut-sei=Takahashi
en-aut-mei=Hiroaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=10
ORCID=

en-aut-name=OhashiYasumasa
en-aut-sei=Ohashi
en-aut-mei=Yasumasa
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=11
ORCID=

en-aut-name=ObataSeiji
en-aut-sei=Obata
en-aut-mei=Seiji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=12
ORCID=

en-aut-name=HaradaAkira
en-aut-sei=Harada
en-aut-mei=Akira
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=13
ORCID=

en-aut-name=IkemotoYuka
en-aut-sei=Ikemoto
en-aut-mei=Yuka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=14
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=15
ORCID=

en-aut-name=UetsujiYasutomo
en-aut-sei=Uetsuji
en-aut-mei=Yasutomo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=16
ORCID=

en-aut-name=MatsubaGo
en-aut-sei=Matsuba
en-aut-mei=Go
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=17
ORCID=

en-aut-name=TakashimaYoshinori
en-aut-sei=Takashima
en-aut-mei=Yoshinori
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=18
ORCID=

affil-num=1
en-affil=Department of Macromolecular Science, Graduate School of Science and Forefront Research Center for Fundamental Sciences, Osaka University
kn-affil=

affil-num=2
en-affil=Department of Macromolecular Science, Graduate School of Science, Osaka University
kn-affil=

affil-num=3
en-affil=Department of Macromolecular Science, Graduate School of Science and Forefront Research Center for Fundamental Sciences, Osaka University
kn-affil=

affil-num=4
en-affil=Graduate School of Organic Materials Engineering, Yamagata University
kn-affil=

affil-num=5
en-affil=Department of Mechanical Engineering, Osaka Institute of Technology
kn-affil=

affil-num=6
en-affil=Department of Macromolecular Science, Graduate School of Science and Forefront Research Center for Fundamental Sciences, Osaka University
kn-affil=

affil-num=7
en-affil=Kanagawa Technical Center, Yushiro Chemical Industry Co., Ltd.
kn-affil=

affil-num=8
en-affil=Kanagawa Technical Center, Yushiro Chemical Industry Co., Ltd.
kn-affil=

affil-num=9
en-affil=Kanagawa Technical Center, Yushiro Chemical Industry Co., Ltd.
kn-affil=

affil-num=10
en-affil=Kanagawa Technical Center, Yushiro Chemical Industry Co., Ltd.
kn-affil=

affil-num=11
en-affil=Kanagawa Technical Center, Yushiro Chemical Industry Co., Ltd.
kn-affil=

affil-num=12
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=13
en-affil=SANKEN (The Institute of Scientific and Industrial Research), Osaka University
kn-affil=

affil-num=14
en-affil=Japan Synchrotron Radiation Research Institute
kn-affil=

affil-num=15
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=16
en-affil=Department of Mechanical Engineering, Osaka Institute of Technology
kn-affil=

affil-num=17
en-affil=Graduate School of Organic Materials Engineering, Yamagata University
kn-affil=

affil-num=18
en-affil=Department of Macromolecular Science, Graduate School of Science and Forefront Research Center for Fundamental Sciences, Osaka University
kn-affil=
en-keyword=stress-strain sensor
kn-keyword=stress-strain sensor
en-keyword=carbon composite
kn-keyword=carbon composite
en-keyword=movable cross-link
kn-keyword=movable cross-link
en-keyword=supramolecular materials
kn-keyword=supramolecular materials
en-keyword=polymericmaterials
kn-keyword=polymericmaterials
en-keyword=tough materials
kn-keyword=tough materials
en-keyword=upcycling
kn-keyword=upcycling
END

start-ver=1.4
cd-journal=joma
no-vol=4
cd-vols=
no-issue=10
article-no=
start-page=2339
end-page=2345
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2022
dt-pub=20220504
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Synergic effect of graphene oxide and boron nitride on the mechanical properties of polyimide composite films
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The addition of two-dimensional (2D) materials into polymers can improve their mechanical properties. In particular, graphene oxide (GO) and hexagonal boron nitride (h-BN) are expected to be potential nanoplatelet additives for polymers. Interactions between such nanoplatelets and polymers are effective in improving the above properties. However, no report has investigated the effect of using two types of nanoplatelets that have good interaction with polymers. In this study, we fabricated polyimide (PI) films that contain two types of nanoplatelets, amine-functionalized h-BN (BNNH2) and GO. We have elucidated that the critical ratio and the content of BNNH2 and GO within PI govern the films' mechanical properties. When the BNNH2/GO weight ratio was 52 : 1 and their content was 1 wt% in the PI film, the tensile modulus and tensile strength were increased by 155.2 MPa and 4.2 GPa compared with the pristine PI film.
en-copyright=
kn-copyright=

en-aut-name=ChengYi Kai
en-aut-sei=Cheng
en-aut-mei=Yi Kai
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=CampéonBenoît Denis Louis
en-aut-sei=Campéon
en-aut-mei=Benoît Denis Louis
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=ObataSeiji
en-aut-sei=Obata
en-aut-mei=Seiji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=3
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=4
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=51
cd-vols=
no-issue=5
article-no=
start-page=1874
end-page=1878
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2022
dt-pub=2022
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Grafting redox-active molecules on graphene oxide through a diamine linker: length optimization for electron transfer
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=A redox-active molecule is grafted on graphene oxide (GO) via successive reactions. In the first step, GO is modified with diamine, which acts as a linker for the redox-active molecule. In the second step, the redox-active molecule is attached to the amino group of the linker by amide bond formation. Through these processes GO is partially reduced, enhancing its electrochemical properties. The structure of the functionalized GO is characterized by XPS, TGA, FTIR, and CV, and applied for electrodes in supercapacitors (SCs). The distance and direction of the redox-active molecule on the electrode affect the SC performance; ethylene diamine is the most promising linker to efficiently transfer electrons from the redox-active molecule to the electrode surface.
en-copyright=
kn-copyright=

en-aut-name=KhanRizwan
en-aut-sei=Khan
en-aut-mei=Rizwan
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

affil-num=1
en-affil=Graduate school of natural science and technology, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate school of natural science and technology, Okayama University
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=573
cd-vols=
no-issue=30
article-no=
start-page=151483
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2022
dt-pub=202201
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Uniform coating of magnesium oxide crystal with reduced graphene oxide achieves moisture barrier performance
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Magnesium oxide (MgO) has high thermal conductivity while keeping insulation; thus, MgO is attractive material as a filler for thermosetting or thermoplastic resins. However, MgO readily hydrates with water or moisture. Thus, the surface of MgO is coated with organic or inorganic substances. <br>
We focused on graphene oxide (GO) as a surface coating agent. It has a 2-dimensional thin sheet structure, oxygen functional groups on the surface, and negative zeta-potential. Typically, GO has been used as a support material for metal nanoparticles. In this research, GO was coated on MgO micro-crystal surface to improve the surface character of MgO. The negatively charged GO and the positively charged MgO were combined with strong interaction. 0.5wt% GO coated MgO showed excellent moisture resistance compared to organic substances coating. Coating of MgO with GO or rGO is effective to overcome the weaknesses of MgO. Due to the hydrophilicity and high thermal conductivity of rGO, MgO/rGO composite can be a filler for high moisture resistance and thermal conductivity.
en-copyright=
kn-copyright=

en-aut-name=SaitoAkinori
en-aut-sei=Saito
en-aut-mei=Akinori
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=ObataSeiji
en-aut-sei=Obata
en-aut-mei=Seiji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Tateho chemical industries co. ltd
kn-affil=

affil-num=2
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=3
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=
en-keyword=magnesium oxide
kn-keyword=magnesium oxide
en-keyword=graphene oxide
kn-keyword=graphene oxide
en-keyword=surface coating
kn-keyword=surface coating
en-keyword=moisture resistance
kn-keyword=moisture resistance
END

start-ver=1.4
cd-journal=joma
no-vol=3
cd-vols=
no-issue=3
article-no=
start-page=034008
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2021
dt-pub=20210412
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Simulating the redox potentials of unexplored phenazine derivatives as electron mediators for biofuel cells
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In this research, we aimed to establish a guideline for designing electron mediators suitable for biofuel cells. A redox potential simulator was fabricated by combining density functional theory calculation and experiment, allowing us to select molecules with appropriate redox potentials efficiently. Previously, mediators have been developed depending on the trials and errors; thus, our strategy will speed up the development of biofuel cells with outstanding performances.
en-copyright=
kn-copyright=

en-aut-name=NakagawaRyo
en-aut-sei=Nakagawa
en-aut-mei=Ryo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

affil-num=1
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=
en-keyword=redox potential
kn-keyword=redox potential
en-keyword=phenazine
kn-keyword=phenazine
en-keyword=mediator
kn-keyword=mediator
en-keyword=simulation
kn-keyword=simulation
en-keyword=DFT
kn-keyword=DFT
END

start-ver=1.4
cd-journal=joma
no-vol=2
cd-vols=
no-issue=10
article-no=
start-page=4417
end-page=4420
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20200824
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Bottom-up synthesis of nitrogen-doped nanocarbons by a combination of metal catalysis and a solution plasma process
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=We aimed to develop the bottom-up synthesis of nanocarbons with specific functions from molecules without any leaving group, halogen atom and boronic acid, by employing a metal catalyst under solution plasma irradiation. Pyridine was used as a source of carbon. In the presence of a Pd catalyst, the plasma treatment enabled the synthesis of N-doped carbons with a pyridinic configuration, which worked as an active catalytic site for the oxygen reduction reaction.
en-copyright=
kn-copyright=

en-aut-name=ZhouYang
en-aut-sei=Zhou
en-aut-mei=Yang
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

affil-num=1
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=363
cd-vols=
no-issue=
article-no=
start-page=137257
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20201210
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Sophisticated rGO synthesis and pre-lithiation unlocking full-cell lithium-ion battery high-rate performances
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=For the application to portable devices and storage of renewable energies, high-performance lithium-ion batteries are in great demand. To this end, the development of high-performance electrode materials has been actively investigated. However, even if new materials exhibit high performance in a simple evaluation, namely half-cell tests, it is often impossible to obtain satisfactory performance with an actual battery (full cell). In this study, the structure of graphene analogs is modified in various ways to change crystallinity, disorder, oxygen content, electrical conductivity, and specific surface area. These graphene analogs are evaluated as negative electrodes for lithium-ion batteries, and we found reduced graphene oxide prepared by combination of chemical reduction and thermal treatment was the optimum. In addition, a full cell is fabricated by combining it with LiCoO2 modified with BaTiO3, which is applicable to high-speed charge–discharge cathode material developed in our previous research. In general, pre-lithiation is performed for the anode when assembling full cells. In this study, we optimized a "direct pre-lithiation" method in which the electrode and lithium foil were in direct contact before assembling a full cell, and created a lithium-ion battery with an output of 293 Wh kg−1 at 8,658 W kg−1.
en-copyright=
kn-copyright=

en-aut-name=CampéonBenoît Denis Louis 
en-aut-sei=Campéon
en-aut-mei=Benoît Denis Louis 
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=YoshikawaYumi
en-aut-sei=Yoshikawa
en-aut-mei=Yumi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=TeranishiTakashi
en-aut-sei=Teranishi
en-aut-mei=Takashi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=4
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=
en-keyword=Graphene
kn-keyword=Graphene
en-keyword=Lithium-ion battery
kn-keyword=Lithium-ion battery
en-keyword=Full-cell
kn-keyword=Full-cell
en-keyword=LiCoO2
kn-keyword=LiCoO2
en-keyword=High-rate
kn-keyword=High-rate
END

start-ver=1.4
cd-journal=joma
no-vol=12
cd-vols=
no-issue=42
article-no=
start-page=21780
end-page=21787
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20200928
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Iron nanoparticle templates for constructing 3D graphene framework with enhanced performance in sodium-ion batteries
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=This study examines the synthesis and electrochemical performance of three-dimensional graphene for Li-ion batteries and Na-ion batteries. The in situ formation of iron hydroxide nanoparticles (Fe(OH)x NPs) of various weights on the surface of graphene oxide, followed by thermal treatment at elevated temperature and washing using hydrochloric acid, furnished 3D graphene. The characterization studies confirmed the prevention of graphene layer stacking by over 90% compared with thermal treatment without Fe(OH)x. The electrochemical performance of the 3D graphene was evaluated as a counter electrode for lithium metal and sodium metal in a half-cell configuration. This material showed good performances with a charging capacity of 507 mA h g−1 at 372 mA g−1 in Li-ion batteries and 252 mA h g−1 at 100 mA g−1 in Na-ion batteries, which is 1.4 and 1.9 times higher, respectively, than the graphene prepared without Fe(OH)x templates.
en-copyright=
kn-copyright=

en-aut-name=CampéonBenoît D. L.
en-aut-sei=Campéon
en-aut-mei=Benoît D. L.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=WangChen
en-aut-sei=Wang
en-aut-mei=Chen
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

affil-num=1
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=11
cd-vols=
no-issue=23
article-no=
start-page=5866
end-page=5873
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20200601
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Carbon-rich materials with three-dimensional ordering at the angstrom level
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Carbon-rich materials, which contain over 90% carbon, have been mainly synthesized by the carbonization of organic compounds. However, in many cases, their original molecular and ordered structures are decomposed by the carbonization process, which results in a failure to retain their original three-dimensional (3D) ordering at the angstrom level. Recently, we successfully produced carbon-rich materials that are able to retain their 3D ordering at the angstrom level even after the calcination of organic porous pillar[6]arene supramolecular assemblies and cyclic porphyrin dimer assemblies. Other new pathways to prepare carbon-rich materials with 3D ordering at the angstrom level are the controlled polymerization of designed monomers and redox reaction of graph. Electrocatalytic application using these materials is described.	
en-copyright=
kn-copyright=

en-aut-name=FaShixin
en-aut-sei=Fa
en-aut-mei=Shixin
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=YamamotoMasanori
en-aut-sei=Yamamoto
en-aut-mei=Masanori
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NishiharaHirotomo
en-aut-sei=Nishihara
en-aut-mei=Hirotomo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=SakamotoRyota
en-aut-sei=Sakamoto
en-aut-mei=Ryota
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=KamiyaKazuhide
en-aut-sei=Kamiya
en-aut-mei=Kazuhide
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=OgoshiTomoki
en-aut-sei=Ogoshi
en-aut-mei=Tomoki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

affil-num=1
en-affil=Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University
kn-affil=

affil-num=2
en-affil=Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
kn-affil=

affil-num=3
en-affil=Institute of Multidisciplinary Research for Advanced Materials, Tohoku University
kn-affil=

affil-num=4
en-affil=Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University
kn-affil=

affil-num=5
en-affil=Graduate School of Engineering Science, Osaka University
kn-affil=

affil-num=6
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=7
en-affil=Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=8
cd-vols=
no-issue=2
article-no=
start-page=238
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20200219
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Structural Optimization of Alkylbenzenes as Graphene Dispersants
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Among the several methods of producing graphene, the liquid-phase exfoliation of graphite is attractive because of a simple and easy procedure, being expected for mass production. The dispersibility of graphene can be improved by adding a dispersant molecule that interacts with graphene, but the appropriate molecular design has not been proposed. In this study, we focused on aromatic compounds with alkyl chains as dispersing agents. We synthesized a series of alkyl aromatic compounds and evaluated their performance as a dispersant for graphene. The results suggest that the alkyl chain length and solubility in the solvent play a vital role in graphene dispersion.
en-copyright=
kn-copyright=

en-aut-name=TakedaShimpei
en-aut-sei=Takeda
en-aut-mei=Shimpei
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

affil-num=1
en-affil=Graduate School of Natural Science & Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Natural Science & Technology, Okayama University
kn-affil=
en-keyword=graphene
kn-keyword=graphene
en-keyword=graphite
kn-keyword=graphite
en-keyword=dispersant
kn-keyword=dispersant
en-keyword=alkylbenzene
kn-keyword=alkylbenzene
en-keyword=liquid-phase exfoliation
kn-keyword=liquid-phase exfoliation
END

start-ver=1.4
cd-journal=joma
no-vol=104
cd-vols=
no-issue=
article-no=
start-page=106475
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=20190731
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Bipolar anodic electrochemical exfoliation of graphite powders
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The electrochemical exfoliation of graphite has attracted considerable attention as a method for large-scale, rapid production of graphene and graphene oxide (GO). As exfoliation typically requires direct electrical contact, and is limited by the shape and/or size of the starting graphite, treatment of small graphite particles and powders, the typical form available commercially, is extremely difficult. In this study, GO nanosheets were successfully prepared from small graphite particles and powders by a bipolar electrochemical process. Graphite samples were placed between two platinum feeder electrodes, and a constant current was applied between the feeder electrodes using dilute sulfuric acid as the electrolyte. Optical microscopy, atomic force microscopy, X-ray diffractometry, Raman spectroscopy, and X-ray photoelectron spectroscopy were employed to examine the samples obtained after electrolysis. The results obtained from these analyses confirmed that anodic electrochemical exfoliation occurs in the graphite samples, and the exfoliated samples are basically highly crystalline GO nanosheets with a low degree of oxidation (C/O = 3.6–5.3). This simple electrochemical method is extremely useful for preparing large amounts of graphene and GO from small particles of graphite.
en-copyright=
kn-copyright=

en-aut-name=HashimotoHideki
en-aut-sei=Hashimoto
en-aut-mei=Hideki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=MuramatsuYusuke
en-aut-sei=Muramatsu
en-aut-mei=Yusuke
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=AsohHidetaka
en-aut-sei=Asoh
en-aut-mei=Hidetaka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University
kn-affil=

affil-num=2
en-affil=Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University
kn-affil=

affil-num=3
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=4
en-affil=Department of Applied Chemistry, School of Advanced Engineering, Kogakuin University
kn-affil=
en-keyword=Graphite
kn-keyword=Graphite
en-keyword=Graphene
kn-keyword=Graphene
en-keyword=Graphene oxide
kn-keyword=Graphene oxide
en-keyword=Electrochemical exfoliation
kn-keyword=Electrochemical exfoliation
en-keyword=Anode
kn-keyword=Anode
en-keyword=Bipolar electrochemistry
kn-keyword=Bipolar electrochemistry
END

start-ver=1.4
cd-journal=joma
no-vol=29
cd-vols=
no-issue=5
article-no=
start-page=2150
end-page=2156
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2017
dt-pub=20170302
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Real-Time, in Situ Monitoring of the Oxidation of Graphite: Lessons Learned
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= Graphite oxide (GO) and its constituent layers (i.e., graphene oxide) display a broad range of functional groups and, as such, have attracted significant attention for use in numerous applications. GO is commonly prepared using the “Hummers method” or a variant thereof in which graphite is treated with KMnO4 and various additives in H2SO4. Despite its omnipresence, the underlying chemistry of such oxidation reactions is not well understood and typically affords results that are irreproducible and, in some cases, unsafe. To overcome these limitations, the oxidation of graphite under Hummers-type conditions was monitored over time using in situ X-ray diffraction and in situ X-ray absorption near edge structure analyses with synchrotron radiation. In conjunction with other atomic absorption spectroscopy, UV–vis spectroscopy and elemental analysis measurements, the underlying mechanism of the oxidation reaction was elucidated, and the reaction conditions were optimized. Ultimately, the methodology for reproducibly preparing GO on large scales using only graphite, H2SO4, and KMnO4 was developed and successfully adapted for use in continuous flow systems.
en-copyright=
kn-copyright=

en-aut-name=MorimotoNaoki
en-aut-sei=Morimoto
en-aut-mei=Naoki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=SuzukiHideyuki
en-aut-sei=Suzuki
en-aut-mei=Hideyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=TakeuchiYasuo
en-aut-sei=Takeuchi
en-aut-mei=Yasuo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=KawaguchiShogo
en-aut-sei=Kawaguchi
en-aut-mei=Shogo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=KunisuMasahiro
en-aut-sei=Kunisu
en-aut-mei=Masahiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

en-aut-name=BielawskiChristopher W.
en-aut-sei=Bielawski
en-aut-mei=Christopher W.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=

en-aut-name=NishinaYuta
en-aut-sei=Nishina
en-aut-mei=Yuta
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=

affil-num=1
en-affil=Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Division of Pharmaceutical Sciences, Okayama University
kn-affil=

affil-num=2
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=

affil-num=3
en-affil=Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Division of Pharmaceutical Sciences, Okayama Universit
kn-affil=

affil-num=4
en-affil=Japan Synchrotron Radiation Research Institute (JASRI), SPring-8
kn-affil=

affil-num=5
en-affil=Toray Research Center, Inc., Surface Science Laboratories
kn-affil=

affil-num=6
en-affil=Center for Multidimensional Carbon Materials (CMCM), Institute for Basic Science (IBS)
kn-affil=

affil-num=7
en-affil=Research Core for Interdisciplinary Sciences, Okayama University
kn-affil=
END