热分解法制备锰铁氧体磁性纳米粒子
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TQ031

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Preparation of magnetic manganese ferrite nanoparticles by thermal decomposition
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    摘要:

    以油酸为表面活性剂,1-十八烯为溶剂,通过高温热分解油酸铁和油酸锰制备了锰铁氧体磁性纳米粒子。考察了热分解温度和时间以及油酸与油酸盐的投料比对磁性纳米粒子结构和性质的影响。结果表明,随着反应温度的提高或反应时间的延长,所得磁性纳米粒子遵循α-Fe2O3-尖晶石结构锰铁氧体-锰铁氧化物固溶体的衍变过程,饱和磁强度也表现出先增强后减弱的规律。磁性纳米粒子形貌转变过程遵循粒子内熟化机理。随着反应时间延长,磁性纳米粒子由纺锤状纳米粒子转变为具有棱角的不规则状纳米粒子,进而形成球状磁性纳米粒子。当油酸与油酸盐物质的量比为0.8,在300℃下热分解反应1h时,磁性纳米粒子饱和磁强度达到15.14emu/g。

    Abstract:

    Magnetic manganese ferrite nanoparticles were prepared by thermal decomposition. The influence of reaction temperature, reaction time and feeding ratio of oleic acid to oleates on the structure and the property of magnetic nanoparticles were investigated. As reaction temperature and time increasing, the crystal structure of the obtained nanoparticles changed from α-Fe2O3 to manganese ferrite with spinel structure, and then to solid solution of manganese oxide and iron oxide, which resulted in the following increase and decrease of magnetic property. The morphology of the nanoparticles transformed with an intra-particle ripening mechanism. As prolonging reaction time, the shape of the nanoparticles changed from spindle to irregular shape, and then to sphere. When the molar feeding ratio of oleic acid to oleates was 0.8, after thermal decomposition at 300 ℃ for 1 h, the saturation magnetic intensity of the obtained nanoparticles reached to 15.14emu/g.

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张亚平,甄彬,黎汉生,冯亚青.热分解法制备锰铁氧体磁性纳米粒子[J].精细化工,2018,35(8):

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  • 收稿日期:2017-08-22
  • 最后修改日期:2017-11-14
  • 录用日期:2017-11-30
  • 在线发布日期: 2018-07-10
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