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Synthesis of Ferrite Nanocrystals Stabilized by Ionic-Liquid Molecules through a Thermal Decomposition Route

Authors

  • Dr. Yu Zhang,

    1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, 130022 (P.R. China), Fax: (+86) 431-85698041, 85685653
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  • Dr. Dapeng Liu,

    1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, 130022 (P.R. China), Fax: (+86) 431-85698041, 85685653
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  • Xiao Wang,

    1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, 130022 (P.R. China), Fax: (+86) 431-85698041, 85685653
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  • Dr. Shuyan Song,

    1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, 130022 (P.R. China), Fax: (+86) 431-85698041, 85685653
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  • Prof. Hongjie Zhang

    Corresponding author
    1. State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, 130022 (P.R. China), Fax: (+86) 431-85698041, 85685653
    • State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun, 130022 (P.R. China), Fax: (+86) 431-85698041, 85685653
    Search for more papers by this author

Abstract

A series of MxFe3−xO4 (M=Fe, Co, Ni, Zn; 0≤x≤1) ferrite nanocrystals stabilized by ionic-liquid molecules have been successfully synthesized through a thermal decomposition route. Instead of the widely used long-chain lipid surfactants and high-boiling solvents, the ionic-liquid molecules not only played the role of surfactants, but also served as reaction and dispersion media simultaneously in the preparation of ferrite nanocrystals. Due to their good fluidity under magnetic fields and high ionic conductivity, the ionic-liquid molecules and MxFe3−xO4 ferrite nanocrystal-based conducting ferrofluids were successfully used as electrolytes in an AC circuit. The open or closed state of the circuit was directly controlled by moving a permanent magnet so as to tune the position of the ferrofluids, and consequently, resulted in the “off” or “on” state of the four indicative yellow-light-emitting diodes. These results demonstrate that the conducting ferrofluids successfully play the role of “magnetic switch”.

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