Preparation of magnetic iron-oxide nanoparticles by successive reduction-oxidation in reverse micelles: Effects of reducing agent and atmosphere

Hironori Iida; Takuya Nakanishi; Harumi Takada; Tetsuya Osaka

doi:10.1016/j.electacta.2006.05.007

Preparation of magnetic iron-oxide nanoparticles by successive reduction-oxidation in reverse micelles: Effects of reducing agent and atmosphere

Hironori Iida, Takuya Nakanishi, Harumi Takada, Tetsuya Osaka^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

The chemical reduction of ferrous or ferric ions to metallic iron by a reducing agent such as sodium borohydride (NaBH₄), hydrazine (N₂H₄), or sodium phosphonate (NaH₂PO₂) and its subsequent oxidation were investigated for the preparation of iron-oxide nanoparticles in reverse micelles. The crystal structure and crystallinity of the oxide nanoparticles were found to depend on the oxidation potential of the reducing agent and the catalytic activity of the surface of deposited iron. In addition, it was demonstrated that the process used for oxidizing the metallic iron was critical for the formation of oxide nanoparticles, and that the enhancement of magnetic properties was achieved by providing a flow of oxygen during the oxidation process.

Original language	English
Pages (from-to)	292-296
Number of pages	5
Journal	Electrochimica Acta
Volume	52
Issue number	1
DOIs	https://doi.org/10.1016/j.electacta.2006.05.007
Publication status	Published - 2006 Oct 5

Keywords

Catalytic activity
Electroless deposition
Iron-oxide nanoparticle
Redox potential
Reverse micelle

ASJC Scopus subject areas

Chemical Engineering(all)
Electrochemistry

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10.1016/j.electacta.2006.05.007

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title = "Preparation of magnetic iron-oxide nanoparticles by successive reduction-oxidation in reverse micelles: Effects of reducing agent and atmosphere",

abstract = "The chemical reduction of ferrous or ferric ions to metallic iron by a reducing agent such as sodium borohydride (NaBH4), hydrazine (N2H4), or sodium phosphonate (NaH2PO2) and its subsequent oxidation were investigated for the preparation of iron-oxide nanoparticles in reverse micelles. The crystal structure and crystallinity of the oxide nanoparticles were found to depend on the oxidation potential of the reducing agent and the catalytic activity of the surface of deposited iron. In addition, it was demonstrated that the process used for oxidizing the metallic iron was critical for the formation of oxide nanoparticles, and that the enhancement of magnetic properties was achieved by providing a flow of oxygen during the oxidation process.",

keywords = "Catalytic activity, Electroless deposition, Iron-oxide nanoparticle, Redox potential, Reverse micelle",

author = "Hironori Iida and Takuya Nakanishi and Harumi Takada and Tetsuya Osaka",

note = "Funding Information: This work was carried out at the Center for Practical Nano-Chemistry and the Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, which are financially supported, respectively, by the 21st Century COE Program and by the Encouraging Development of Strategic Research Centers Program of the Ministry of Education, Culture, Sports, Science and Technology, Japan. Assistance in manuscript preparation provided by Dr. Yutaka Okinaka is gratefully acknowledged.",

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AU - Iida, Hironori

AU - Nakanishi, Takuya

AU - Takada, Harumi

AU - Osaka, Tetsuya

N1 - Funding Information: This work was carried out at the Center for Practical Nano-Chemistry and the Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, which are financially supported, respectively, by the 21st Century COE Program and by the Encouraging Development of Strategic Research Centers Program of the Ministry of Education, Culture, Sports, Science and Technology, Japan. Assistance in manuscript preparation provided by Dr. Yutaka Okinaka is gratefully acknowledged.

PY - 2006/10/5

Y1 - 2006/10/5

N2 - The chemical reduction of ferrous or ferric ions to metallic iron by a reducing agent such as sodium borohydride (NaBH4), hydrazine (N2H4), or sodium phosphonate (NaH2PO2) and its subsequent oxidation were investigated for the preparation of iron-oxide nanoparticles in reverse micelles. The crystal structure and crystallinity of the oxide nanoparticles were found to depend on the oxidation potential of the reducing agent and the catalytic activity of the surface of deposited iron. In addition, it was demonstrated that the process used for oxidizing the metallic iron was critical for the formation of oxide nanoparticles, and that the enhancement of magnetic properties was achieved by providing a flow of oxygen during the oxidation process.

AB - The chemical reduction of ferrous or ferric ions to metallic iron by a reducing agent such as sodium borohydride (NaBH4), hydrazine (N2H4), or sodium phosphonate (NaH2PO2) and its subsequent oxidation were investigated for the preparation of iron-oxide nanoparticles in reverse micelles. The crystal structure and crystallinity of the oxide nanoparticles were found to depend on the oxidation potential of the reducing agent and the catalytic activity of the surface of deposited iron. In addition, it was demonstrated that the process used for oxidizing the metallic iron was critical for the formation of oxide nanoparticles, and that the enhancement of magnetic properties was achieved by providing a flow of oxygen during the oxidation process.

KW - Catalytic activity

KW - Electroless deposition

KW - Iron-oxide nanoparticle

KW - Redox potential

KW - Reverse micelle

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Preparation of magnetic iron-oxide nanoparticles by successive reduction-oxidation in reverse micelles: Effects of reducing agent and atmosphere

Abstract

Keywords

ASJC Scopus subject areas

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