JaLCDOI 10.18926/15459
フルテキストURL Mem_Fac_Eng_OU_23_1_31.pdf
著者 三浦 嘉也| Yuasa Motokazu| 尾坂 明義| 高橋 克明|
抄録 Sodium borosilicate gels of compositions similar to that of Vycor(R) glass like 80SiO(2).15B(2)O(3).5Na(2)O(wt%) were prepared from hydrolysis and polycondensation of tetraethyl orthosilicate, trimethyl borate, and sodium methylate under the HCl catalysis. Variation of the gelation time is examined as a function of the mixing ratio of the starting materials and the catalyst. The thermal behavior of the gels has been discussed on the basis of their TG and DTA traces.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1988-11-22
23巻
1号
開始ページ 31
終了ページ 38
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307464
JaLCDOI 10.18926/15462
フルテキストURL Mem_Fac_Eng_OU_23_1_39.pdf
著者 尾坂 明義| Yuasa Motokazu| 三浦 嘉也| 高橋 克明|
抄録 Sodium borosilicate gels of compositions similar to that of Vycor(R) glass like 80SiO(2).15B(2)O(3).5Na(2)O (wt%) were prepared from hydrolysis and polycondensation of metal alkoxides under the HCl catalysis. Variation of specific surface area and porosity with temperature indicated that closed pores were opened below 400℃, and collapsed above 450℃ after the porosity reached a maximum value around 450℃. The structural evolution was examined due to IR spectra and a phase separation in the gels was observed. The solubility of the gels into 1N-HCl was studied as a function of the treatment temperature.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1988-11-22
23巻
1号
開始ページ 39
終了ページ 48
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307518
JaLCDOI 10.18926/15474
フルテキストURL Mem_Fac_Eng_OU_24_1_53.pdf
著者 尾坂 明義| Takao Seiji| 小田 喜一| 高田 潤| 三浦 嘉也|
抄録 Electrical resistance and X-ray photoelectron depth profile analysis are studied for antimony doped tin oxide films developed on silica, alkali-free and sodalime slide glass substrates. The sodium ions diffused from the substrates to the films prevented the crystal growth of rutile type tin oxide in the film, resulting in the high electrical resistance. A diffusion layer has been detected for each film with diffuse profiles of multi valent cations (Sn, Si or Ca) at the interface of the tin oxide film and substrate. A greater amount of sodium atoms have been detected in the film developed on the soda-lime glass while almost no sodium atoms have been found in those on the other substrates. This can be explained by the diffusion of the sodium ions in the substrate due to a drastic hydronium-sodium exchange mechanism under highly acidic conditions during the dipping and drying processes.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1989-11-29
24巻
1号
開始ページ 53
終了ページ 61
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307279
JaLCDOI 10.18926/15486
フルテキストURL Mem_Fac_Eng_OU_25_1_23.pdf
著者 三浦 嘉也| 高田 潤| 尾坂 明義| 河村 利夫|
抄録 Zinc oxide films were prepared on silica glass substrates by the use of an r.f. activated reactive evaporation (ARE) method, and were examined by X-ray diffraction (XRD) and scanning electron micrograph (SEM). XRD measurements indicate that the films were c-axis oriented and that an r.f. plasma of Zn and O was necessary for the ZnO film deposition. Substrate temperature, oxygen gas pressure, evaporation rate, r.f. power and inlet position of oxygen gas effect the c-axis orientation, the growth rate and the microstructure of the films. Optimum conditions for a dense film with a fine texture of the surface and having good crystallinity were as follows: the substrate temperature;400℃, the evaporation rate;5.0(A)/s, the oxygen pressure;2.0x10(-4) Torr, the r.f. power;150 to 200W, and the oxygen gas inlet near the substrate. For the film prepared under the optimum conditions, the standard deviation σ of the rocking curve for the (002) diffraction was 1.9deg, smaller than that of the film prepared by using an r.f. sputtering method.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1990-12-14
25巻
1号
開始ページ 23
終了ページ 35
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307600
著者 尾坂 明義|
発行日 1991-12
出版物タイトル 環境制御
13巻
資料タイプ その他
JaLCDOI 10.18926/15436
フルテキストURL Mem_Fac_Eng_OU_26_2_69.pdf
著者 Fujii, Tatsuo| Sakata Naoki| Nanba, Tokuro| Osaka, Akiyoshi| Miura, Yoshinari| Takada, Jun|
抄録 (001)-oriented Ti(2)O(3) films were epitaxially grown on a(001)-face of sapphire single-crystalline substrate by an activated reactive evaporation method. The formation ranges of stoichiometric and nonstoichiometric Ti(2)O(3) films were determined as a function of the substrate temperature (Ts), the oxygen pressure (Po(2)) and the deposition rate. Stoichiometric Ti(2)O(3) films were grown at Ts≧673K under Po(2)≧1.0×10(-4)Torr, which showed the metal-insulator transition with a sharp change in electrical resistivity from 3.5×10(-2) to 2.6×10(-3)Ωcm at 361K. Nonstoichiometric films prepared under less oxidized conditions did not exhibit the transition. The nonstoichiometry of the Ti(2)O(3)films was discussed in terms of excess Ti ions.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-03-28
26巻
2号
開始ページ 69
終了ページ 75
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307639
JaLCDOI 10.18926/15473
フルテキストURL Mem_Fac_Eng_OU_26_2_61.pdf
著者 Osaka, Akiyoshi| Kawabata Kouji| Nanba, Tokuro| Takada, Jun| Miura, Yoshinari|
抄録 Mullite-dispersed silica ceramics were prepared through sol-gel processing by the use of tetraethoxy silane, aluminium nitrate and aluminium isopropoxide as the Si and Al sources where HCl and HN0(3) were the catalyst. Effect of the starting materials, solvents and catalysts was examined on the gelation time or temperature of mullite precipitation. Apparent activation energy of gelation ranged from 80 to 95kJ/mol. The presence of AI in the sols elongated the gelling time suggesting the formation of chelate bonds between AI and Si-OR or Si-OH bonds.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1992-03-28
26巻
2号
開始ページ 61
終了ページ 67
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307416
JaLCDOI 10.18926/15464
フルテキストURL Mem_Fac_Eng_OU_28_2_77.pdf
著者 尾坂 明義| Kawamura Haruyuki| 三浦 嘉也|
抄録 Amorphous films of lead oxyfluorosilicate were prepared with a rf-sputtering technique, and the distribution profiles of the component elements and chemical states of the fluoride ions were analyzed with an X-ray photoelectron spectrometer. Si atoms with an expanded coordination, O(4)Si-F, were present near the surface, and O(3)Si-F units were present in the deeper part of the films. Electrical resistance indicated transition to a conduction state for the films containing fluoride ions, while the films were crystallized to precipitate low quartz by the irradiation of He-Ne laser of 3 mW up to 1 sec.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1994-03-15
28巻
2号
開始ページ 77
終了ページ 84
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307766
JaLCDOI 10.18926/15426
フルテキストURL Mem_Fac_Eng_OU_29_2_77.pdf
著者 都留 寛治| Nishiyama Chikako| 大槻 主税| 尾坂 明義|
抄録 Poly(methyl methacrylate) substrates were immersed in suspensions containing bioactive 50CaO・50SiO(2) (mol%) glass particles (45 μm in diameter) and a 6:4 (volume fraction) mixture of ethanol and THF, and an ultrasonic energy was applied to the system. A layer of glass particles was implanted and covered more than 50% of the substrate surface. Thin film X-ray diffraction patterns and FT-IR reflection spectra indicated deposition of apatite on the glass-implanted substrates after they were soaked for 12 h in a simulated body fluid similar in apatite-deposition ability to the human blood plasma. Flake-like apatite crystallites formed on the substrate soaked in SBF for 3 days.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1995-03-27
29巻
2号
開始ページ 77
終了ページ 81
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307332
JaLCDOI 10.18926/15428
フルテキストURL Mem_Fac_Eng_OU_29_2_83.pdf
著者 都留 寛治| Nishiyama Chikako| 大槻 主税| 尾坂 明義|
抄録 One of the CaO,SiO(2)-based bioactive glasses(5OCaO・ 5OSiO (2) in mol%) were soaked for various periods in a simulated body fluid(SBF) with or without containing alcohols such as methanol, ethanol, and 1-propanol. Effect of the alcohols was investigated on the apatite formation on the glass surface with thin-film X-ray diffraction, FT-IR reflection spectroscopy and scanning electron microscopy. Under the presence of alcohols up to 0.1mol/l in the SBF an apatite layer was formed on the glass, while it consisted of crystallites similar in morphology but larger in size than that found for the SBF without the alcohols. It was concluded that the alcohols little influenced the the apatite forming ability of the CaO,SiO(2)-based glasses.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1995-03-27
29巻
2号
開始ページ 83
終了ページ 88
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307301
著者 尾坂 明義|
発行日 1995-12-20
出版物タイトル 環境制御
17巻
資料タイプ その他
JaLCDOI 10.18926/fest/11645
タイトル(別表記) Selective reduction of nitrogen oxide with propylene on alumina-zirconia prepared from Al chelate compound and Zr alkoxide
フルテキストURL 001_199_204.pdf
著者 川端 浩二| 吉松 英之| 矢吹 達美| 尾坂 明義| 三浦 嘉也|
抄録 An alumina-zirconia (AZ) composite powder was prepared by thermal decomposition of the organic precursors, which were synthesized from ethyl acetoacetate aluminium diisopropylate and zirconium n-butoxide. Specific surface area of AZ was higher than that of alumina-zirconia (ALK) prepared from aluminium sec-butoxide and zirconium nbutoxide. True density of AZ was lower than that of ALK. Selective reduction of nitrogen oxide with propylene in oxygen-rich atmosphere on AZ was superior to that on ALK.
キーワード Al chelate compound Zr alkoxide alumina-zirconia specific surface area true density selective reduction of nitrogen oxide
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1996-03
1巻
1号
開始ページ 199
終了ページ 204
ISSN 1341-9099
言語 日本語
論文のバージョン publisher
NAID 110002291536
JaLCDOI 10.18926/19594
フルテキストURL Mem_Fac_Eng_OU_31_2_39.pdf
著者 Imayoshi Naoki| 早川 聡| 大槻 主税| 尾坂 明義|
抄録 Nb(2)O(5)-and Ta(2)O(5)-doped calcium si1icate glasses were soaked for various periods in a simulated body fluid(Kokubo solution) up to 30 days. Apatite formation ability of the surface of these glasses were investigated with thin-film X-ray diffraction and FT-IR reflection spectroscopy. The effects of these additive oxides on the bioactivity of CaO・SiO(2) based glass were discussed. A small amount of Nb(2)O(5) and Ta(2)O(5) suppressed the rate of silica hydrogel layer formation and the apatite formation on the surface of the glasses. The rate of the apatite nucleation on the surface of Nb(2)O(5)-doped calcium silicate glass was slower than that on the surface of Ta(2)O(5)-doped calcium silicate glass. It was concluded that the decrease in the apatite forming ability of calcium silicate glasses by these additive oxides is attributed to the suppression of formation of silica hydrogel layer which plays an important role in apatite nucleation.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1997-03-28
31巻
2号
開始ページ 39
終了ページ 44
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002309151
JaLCDOI 10.18926/19596
フルテキストURL Mem_Fac_Eng_OU_31_2_45.pdf
著者 尾坂 明義| Kobayashi Keizo| 早川 聡| 大槻 主税|
抄録 The thermal expansion coefficient of some bioactive glasses in the system CaO-SiO(2)-B(2)O(3) were adjusted to be similar to that of titanium by controlling the composition. A glass of composition 45CaO・30SiO(2)・25B(2)O(3) was selected among those as the enameling glass. A slurry was prepared by mixing the glass powder and ethanal to be developed on titanium and heated at 740℃ for 30 min. Thus treated specimen was soaked in a simulated body fluid (Kokubo solutiion). FT-IR reflection and thin film X-ray diffraction analyses indicated apatite formation on the glass coating layer within 12 h of soaking in the fluid. Thus titanium could be provided with bioactivity due to the enameling.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1997-03-28
31巻
2号
開始ページ 45
終了ページ 51
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002309181
JaLCDOI 10.18926/19677
フルテキストURL Mem_Fac_Eng_OU_33_2_79.pdf
著者 尾坂 明義| 早川 聡| Koyano Keiko| 都留 寛治|
抄録 A titanium oxide gel was electrochemically prepared on Ti with a cell consisting of Ti as the working electrode, Pt as the counter one, AgCl as the reference one, and an aqueous solution of 0.1 mol/L Ca(NO(3))(2) as the electrolyte solution. The Ti electrode was kept at 9.5V for 1 hr for oxidation and subsequently kept at-3.0V for 10 min (Ca9.5-3.0):calcium ions were expected to be adsorbed at the latter treatment. Other Ti specimen was kept at -3.0V for 10 min (Ca-3.0). Both specimens were found so bioactive as to deposit apatite in 12 hr (Ca9.5-3.0) and in 1 day (Ca-3.0) when soaked in a simulated body fluid (Kokubo solution). Calcium carbonate detected on the surface of Ca9.5-3.0 caused no harmful effects on spontaneous deposition of apatite in the fluid.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 1999-04-27
33巻
2号
開始ページ 79
終了ページ 84
ISSN 0475-0071
言語 日本語
論文のバージョン publisher
NAID 120002309011
JaLCDOI 10.18926/15363
フルテキストURL Mem_Fac_Eng_OU_34_39.pdf
著者 早川 聡| 城崎 由紀| 籔田 武司| 都留 寛治| Ohtsuki Chikara| 尾坂 明義|
抄録 Silicone elastomer was chemically treated at 60℃ for 7 days with 30 wt% H(2)O(2) solutions with or without TaCl(5) and soaked for various periods in a simulated body fluid(Kokubo solution) up to 21 days. Apatite formation ability of the surface of the silicone elastomer specimens was investigated with thin-film X-ray diffraction and FT-IR reflection spectroscopy. These silicone specimens did not deposit apatite or calcium phosphates, irrespective of chemical treatment. Osteoblast-like cells (MC3T3-El) derived from mouse were cultured on the specimens at 36.5℃ under 5%C0(2) and 95% humidity. Similar degree of proliferation of cells was observed at 7 days among three specimens, while the no treatment specimen after incubation for 5 days showed a lower degree of proliferation than the silicone treated with 30 wt% H(2)O(2) solutions with or without TaCl(5). Alkaline phosphatase activity of the cells proliferated on the no treatment specimen was lower than those of the silicone treated with 30 wt% H(2)O(2) solutions with or without TaCl(5). These results indicate that the cytotoxicity of the silicone could be improved by the chemical treatment with 30 wt% H(2)O(2) solutions with or without TaCl(5).
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2000-03-27
34巻
1-2号
開始ページ 39
終了ページ 43
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002308019
JaLCDOI 10.18926/47005
フルテキストURL mfe_36_1_117_121.pdf
著者 Shirosaki, Yuki| Tsuru, Kanji| Hayakawa, Satoshi| Osaka, Akiyoshi| Takashima, Seisuke|
抄録 γ-Methacryloxypropyltrimethoxysilane (γ-MPS) was grafted to silicone due to emulsion polymerization to induce Si-OH groups, in order to provide silicone with bioactivity spontaneous deposition of apatite in body fluid and to improve cytocompatibility. Apatite deposited on the grafted silicone within 7 days of soaking in 1.5 times as concentrated as the Kokubo solution. Osteoblastic cells (MC3T3-E1) were cultured on the specimens up to 7 days. After 5 days of culture, the number of MC3T3-E1 cells on the grafted specimen was much greater than that on the original specimen. These results indicated that the biocompatibility of silicone elastomer was improved by the grafting γ-MPS.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2001-12
36巻
1号
開始ページ 117
終了ページ 121
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120003497031
JaLCDOI 10.18926/47027
フルテキストURL mfe_36_2_067_072.pdf
著者 Yoshioka, Tomohiko| Tsuru, Kanji| Hayakawa, Satoshi| Osaka, Akiyoshi|
抄録 Alginic acid was immobilized on γ-aminopropyltriethoxysilane-coated glass as a model substrate since an alginic acid layer was known to prevent cell adhesion. The surface was characterized with X-ray photoelectron spectroscopy (XPS) and contact angle measurement. The coated substrates adsorbed practically no calcium phosphates on their surfaces when soaked in a simulated body fluid (SBF) of Kolrubo recipe. Since calcium ions are one of the factors for blood clotting, the present alginic acid coating is one of the candidates to improve blood compatibility of clinical materials.
出版物タイトル Memoirs of the Faculty of Engineering, Okayama University
発行日 2002-03
36巻
2号
開始ページ 67
終了ページ 72
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 80015582225
フルテキストURL fulltext.pdf
著者 Chen, Xuewen| Lian, Tingting| Zhang, Bo| Du, Yuqing| Du, Kexue| Xiang, Nan| Jung, Dong-Won| Wang, Guangxin| Osaka, Akiyoshi|
キーワード cancellous bone honeycomb structure selective laser sintering equivalent modulus of elasticity uniaxial compression FEM
発行日 2021-04-14
出版物タイトル Materials
14巻
8号
出版者 MDPI
開始ページ 1965
ISSN 1996-1944
資料タイプ 学術雑誌論文
言語 英語
OAI-PMH Set 岡山大学
著作権者 © 2021 by the authors.
論文のバージョン publisher
PubMed ID 33919911
NAID 120007037375
DOI 10.3390/ma14081965
Web of Science KeyUT 000644548800001
関連URL isVersionOf https://doi.org/10.3390/ma14081965