分子自组装技术制备表面富羧基核—壳型磁性纳米颗粒

发布时间：2019-05-11 08:36

【摘要】：本文利用分子自组装技术研究了表面富羧基核-壳型磁性纳米颗粒的制备方法,并对制备条件进行了优化和对所制得的纳米颗粒作了表征。首先,利用改进的化学共沉淀一步法制备表面单层油酸包覆的Fe3O4磁性纳米颗粒。制得颗粒粒径约14nm,饱和磁化强度为59emu/g,油酸包覆量约9.7%。然后,利用自组装法制备羧基功能化核-壳型磁性纳米颗粒,所用羧基单体为两亲性小分子4-乙烯基苯甲酸,并对影响自组装体系构筑及聚合过程的因素进行了探究。得到的最佳实验条件为：反应体系温度为80℃,反应溶剂为蒸馏水,引发剂与单体量比为1：5,自组装时间3hr,聚合时间2hr。最后,探究了高性能羧基化磁性纳米颗粒的制备,发现在最佳实验条件下,当单体与磁性纳米颗粒的质量比大约在4：1时包覆完全,此时制得的磁性纳米颗粒中聚合物含量为15.3%,壳层厚度约2.5nm,饱和磁化强度为31.8emu/g,羧基含量高达1.071mmol/g。
[Abstract]:In this paper, the preparation method of surface carboxy-rich core-shell magnetic nanoparticles was studied by molecular self-assembly technique, and the preparation conditions were optimized and the prepared nanoparticles were characterized. Firstly, the monolayer oleic acid coated Fe3O4 magnetic nanoparticles were prepared by an improved one-step chemical coprecipitation method. The particle size is about 14 nm, the saturation magnetization is 59 emu / g, and the amount of oleic acid coating is about 9.7%. Then, Carboxyl functionalized core-shell magnetic nanoparticles were prepared by self-assembly method. The carboxy monomer used was Amphiphilic small molecule 4-vinylbenzoic acid, and the factors affecting the construction and polymerization process of self-assembly system were investigated. The optimum experimental conditions are as follows: the temperature of the reaction system is 80 鈩，

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