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超聲乳化法制備納米Fe3O4磁性顆粒及殼聚糖表面改性

Preparation of Fe3O4 magnetic nanoparticles by ultrasonic emulsification and research of magnetic fluids with chitosan modification

  • 摘要: 采用超聲乳化法制備納米Fe3O4磁性顆粒,以殼聚糖作為表面活性劑,制備具有生物親和性的水基Fe3O4磁流體.研究了Fe2+/Fe3+摩爾比、超聲時間和表面活性劑用量對磁流體性能的影響.結果表明:當Fe2+/Fe3+摩爾比為1:1.5,滴加氨水時反應溫度為70℃時,可制備理想納米Fe3O4磁性顆粒;超聲時間為7.5min左右,質量分數1%的殼聚糖溶液體積占FeO溶液總體積的50%時,有利于殼聚糖分子的包覆,使磁流體具有較高的比飽和磁化強度及穩定性.

     

    Abstract: Fe3O4 magnetic nanoparticles were prepared by means of ultrasonic emulsification and then the Fe3O4 magnetic fluid was made by dispersing these particles into water with chitosan as surfactants.The influences of the molar ratio of Fe2+ to Fe3+,ultrasonic time and the amount of chitosan on the magnetic properties of the magnetic fluid were investigated.The results show that ideal Fe3O4 magnetic nanoparticles can be obtained under the condition that the molar ratio of Fe2+ to Fe3+ is 1:1.5 and the reaction temperature is 70℃ when dropping ammonia.The prepared magnetic fluid has high specific saturation magnetization and stability when the volume of the 1% chitosan solution is 50% as large as the total volume of the mixed Fe3O4 solution and the ultrasonic time after dropping chitosan is 7.5 min,which are in favor of coating the magnetic particles with chitosan.

     

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