辐射法制备超顺磁性有机无机杂化微球

发布时间：2018-10-15 07:06

【摘要】：磁性纳米复合材料除了拥有其独特的磁性能之外,还具备一些高分子微球的功能。具有多空结构的磁性复合微球有较大的内部空间和小的密度以及很高的比表面积：而表面皱褶的磁性复合微球具有大比表面积和良好的表面改性前景。因此,该类材料在适用于催化反应、污水的处理以及生物制药等领域。本论文的研究重点即是以四氧化三铁纳米粒子为核心,探讨用不同方法制备不同形貌的超顺磁性有机-无机杂化微球。主要内容分为以下三个部分：1.辐射法制备壳上有孔的超顺磁性多空复合微球。先用共沉淀法制备两亲性的Fe304纳米粒子,通过调整实验参数控制Fe304纳米粒子表面上的油酸含量,已获得合适的亲水亲油性。该部分工作在本实验室杨松师兄的工作基础上进行的。我们将改性的Fe304纳米粒子(MPs)与单体St均匀混和,制备稳定的细乳液,最后采用辐射法在常温常压下引发单体聚合,从而成功地制备了壳上有孔的超顺磁性多空复合微球。研究表明,两亲性的Fe304纳米粒子对复合微球的形貌有着至关重要的影响。采用γ射线辐照还具有灭菌的作用,有利于该产品在生物、医学等领域的应用。2.辐射法制备弥散型的超顺磁性纳米复合微球。以DVB作为功能性单体,SDS和CA作为协同作用的稳定剂,以细乳液为软模板,通过γ射线辐射聚合制备弥散型结构的超顺磁性纳米复合微球。我们可以通过改变实验中不同组分的含量来实现对四氧化三铁纳米粒子完全且均匀地包裹,同时可以避免纯聚合物颗粒(没有Fe304)和裸露的磁性粒子(没有聚合物层)的产生。3.辐射法制备超顺磁性核桃状杂化微球。以DVB作为功能性的单体,SDS和HD作为协同作用的稳定剂,在MPs存在下的细乳液体系中,通过γ射线辐射聚合制备了核桃状杂化微球。研究表明辐照时间、DVB以及HD等都对微球的形貌有着重要的影响。
[Abstract]:In addition to its unique magnetic properties, magnetic nanocomposites also have some functions of polymer microspheres. Magnetic composite microspheres with multivoid structure have large internal space, small density and high specific surface area, while magnetic composite microspheres with pleated surface have large specific surface area and good surface modification prospect. Therefore, these materials are suitable for catalytic reactions, sewage treatment and biopharmaceutical applications. This paper focuses on the preparation of superparamagnetic organic-inorganic hybrid microspheres with different morphologies using Fe _ 2O _ 4 nanoparticles as the core. The main content is divided into the following three parts: 1. The superparamagnetic multivoid composite microspheres with pores on the shell were prepared by radiation method. Amphiphilic Fe304 nanoparticles were prepared by coprecipitation method. By adjusting the experimental parameters to control the oleic acid content on the surface of Fe304 nanoparticles, a suitable hydrophilicity was obtained. This part of the work in our laboratory on the basis of the work of brother Yang Song. A stable fine emulsion was prepared by mixing the modified Fe304 nano-particle (MPs) with the monomer St. Finally, the superparamagnetic polyvoid composite microspheres with pores on the shell were successfully prepared by radiation method to initiate monomer polymerization at room temperature and atmospheric pressure. The results show that amphiphilic Fe304 nanoparticles play an important role in the morphology of composite microspheres. 纬-ray irradiation also has sterilizing effect, which is beneficial to the application of this product in biological, medical and other fields. 2. Dispersive superparamagnetic nanocomposite microspheres were prepared by radiation method. Superparamagnetic nanocomposite microspheres with dispersive structure were prepared by 纬 -ray radiation polymerization using DVB as functional monomer, SDS and CA as synergistic stabilizers and fine emulsion as soft template. We can completely and uniformly encapsulate Fe _ 2O _ 3 nanoparticles by changing the content of different components in the experiment, and avoid the production of pure polymer particles (no Fe304) and naked magnetic particles (no polymer layer). Superparamagnetic walnut hybrid microspheres were prepared by radiation method. Walnut hybrid microspheres were prepared using DVB as functional monomer and SDS and HD as synergistic stabilizers. Walnut hybrid microspheres were prepared by 纬 -ray radiation polymerization in the presence of MPs. The results show that irradiation time, DVB and HD all play an important role in the morphology of the microspheres.
【学位授予单位】：中国科学技术大学
【学位级别】：硕士
【学位授予年份】：2011
【分类号】：TB383.1;TB33

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