【摘要】：本文利用分子自組裝技術研究了表面富羧基核-殼型磁性納米顆粒的制備方法,并對制備條件進行了優(yōu)化和對所制得的納米顆粒作了表征。首先,利用改進的化學共沉淀一步法制備表面單層油酸包覆的Fe3O4磁性納米顆粒。制得顆粒粒徑約14nm,飽和磁化強度為59emu/g,油酸包覆量約9.7%。然后,利用自組裝法制備羧基功能化核-殼型磁性納米顆粒,所用羧基單體為兩親性小分子4-乙烯基苯甲酸,并對影響自組裝體系構筑及聚合過程的因素進行了探究。得到的最佳實驗條件為：反應體系溫度為80℃,反應溶劑為蒸餾水,引發(fā)劑與單體量比為1：5,自組裝時間3hr,聚合時間2hr。最后,探究了高性能羧基化磁性納米顆粒的制備,發(fā)現(xiàn)在最佳實驗條件下,當單體與磁性納米顆粒的質量比大約在4：1時包覆完全,此時制得的磁性納米顆粒中聚合物含量為15.3%,殼層厚度約2.5nm,飽和磁化強度為31.8emu/g,羧基含量高達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，

本文編號：2474350