Preparation of Magnetite Superfine Sol in W/O Microemulsion and its Properties

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  • GOBE Masao
    Juio Factory, Toyo Ink Mfg. Co., Ltd
  • KANDORI Kazuhiko
    Detartmant of Industrial Chemistry, Institute of Surface and Colloid Chemistry
  • KON-NO Kijiro
    Detartmant of Industrial Chemistry, Institute of Surface and Colloid Chemistry
  • KITAHARA Ayao
    Detartmant of Industrial Chemistry, Institute of Surface and Colloid Chemistry

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Other Title
  • W/Oマイクロエマルション相を利用するマグネタイト超微粒子ゾルの調製とその性質
  • W O マイクロエマルションソウ オ リヨウスル マグネタイト チョウ ビリュ

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Abstract

W/O microemulsions consisting of Aerosol OT (AOT) or polyoxyethylene (6) nonylphenyl ether (NP-6) /water/cyclohexane or isooctane were utilized to prepare Fe3O4 sols. Two methods were carried out for the preparation. One procedure was addition of aqueous FeCl2 solution to the mixture of two kinds of AOT/H2O/isooctane microemulsions solubilizing aqueous FeCl3 and aqueous NH3. An alternative one was to add the NP-6/aqueous FeCl2 solution/cyclohexane microemulsion in AOT cyclohexane solubilizing FeCl3 and NH3 solutions.<BR>The monodisperse magnetite sols having superfine particles of 30-50 ÅA in diameter were obtained. It was apparent that the sols show superparamagnetic behavior from the temperature dependence of Mössbauer spectra. The sols were also stable for long time. The remarkable stability was explained from the entropic repulsion energy of alkyl groups of surfactant molecules adsorbed on the sol particles.

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