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ID 61472
Author
Koizumi, Hayato Department of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama University
Uddin, Md. Azhar Department of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama University
Kato, Yoshiei Department of Material and Energy Science, Graduate School of Environmental and Life Science, Okayama University ORCID publons
Abstract
The effect of ultrasonic irradiation on direct maghemite (γ-Fe2O3) preparation by a co-precipitation method with Fe3+ salt (Fe(NO3)3) and an excess amount of alkaline (KOH) solution without going through the conventional magnetite (Fe3O4) formation route was explored in comparison with impeller stirring. The preparation procedure for obtaining iron oxide nanoparticles was designed using the sequential processes of precipitation, decantation, drying and thermal dehydration, and ultrasonic irradiation or impeller stirring was done during the precipitation process. γ-ferric oxyhydroxide (γ-FeOOH) was partially formed in addition to α-ferric oxyhydroxide (α-FeOOH) and thermally dehydrated to γ-Fe2O3 and hematite (α-Fe2O3) by ultrasonic-assisted co-precipitation of Fe3+ salt and the excess KOH solution, whereas only α-FeOOH and α-Fe2O3 were synthesized by impeller stirring. The difference between the products of the two methods was explained by the Lamer model associated with the nucleation and growth of FeOOH. Magnetization increased as the crystallite diameter decreased, which is estimated to facilitate partial formation of magnetic γ-Fe2O3. Magnetization was enhanced by a lower ultrasonic frequency due to the stronger shock wave induced by the cavitation effect.
抄録(別言語)
This fulltext is available in Dec. 2022.
Keywords
γ-Fe2O3
Ultrasonic irradiation
Impeller stirring
γ-FeOOH
Co-precipitation method
Published Date
2021-02
Publication Title
Inorganic Chemistry Communications
Volume
volume124
Publisher
Elsevier
Start Page
108400
ISSN
1387-7003
NCID
AA11313943
Content Type
Journal Article
language
英語
OAI-PMH Set
岡山大学
File Version
author
DOI
Web of Science KeyUT
Related Url
isVersionOf https://doi.org/10.1016/j.inoche.2020.108400
License
https://creativecommons.org/licenses/by-nc-nd/4.0/