一维磁性核壳多重响应性柔性纳米链的制备及其传感性质研究

In recent years, one-dimensional (1D) magnetic ordering chains assembled by magnetic nanoparticles have attracted much attention due to the novel properties and potential applications in electrical, optical and magnetic areas; therefore, it is very important to develop 1D multifunctional nanochains with different functional and environmental responsive groups on their surface. Based on the synthesis of monodisperse magnetic multiple responsive microspheres with different size, polymer composition and regulating structure, the effect of assemble size, media, the thickness of responsive polymer layer, chain length and aggregation on one-dimensional assemble structure and ability to regulate band gap will be further investigated. As the temperature and pH value changed, sensing mechanism of temperature and pH value were studied to make theoretical foundation for this functional colloidal crystal with magnetic response mechanism.

近年来，磁性纳米粒子组装的一维磁性有序纳米链状结构以其在电学、光学和磁学等方面表现出来的独特性质而受到研究者们的广泛关注，因此，研发表面带有不同官能基团的、环境响应性的一维磁性多功能纳米链具有非常重要的意义。本项目提出开展多重响应性一维磁性柔性纳米链的制备、组装及其传感性质的研究工作，拟设计并合成系列具有不同尺度、表面聚合物组成、结构可调控的单分散高磁响应性环境敏感型磁性微球，在此基础上，深入研究组装基元粒径、介质、磁球表面环境响应性聚合物层厚度、链长和聚集态等因素对一维磁性柔性纳米链组装结构及带隙调节能力影响规律；在温度和pH等环境因素改变时，开展一维磁性纳米链对温度和pH传感机理的研究，从而为新型磁响应机制的功能胶体光子晶体的推广应用奠定理论基础。

采用溶剂热法制备系列不同尺度的磁性微球，研究了反应条件对微球粒径的调控，确定系列多尺度磁性复合微球的合成工艺；采用活性沉淀聚合技术来制备一系列磁含量高、表面洁净度好的多重响应性磁性纳米复合微球，通过改变聚合条件来调控高分子聚集态结构，研究温度和pH响应性聚合物链在磁球表面的生长机理；通过磁场强度及分布的调控，实现一维磁性柔性纳米链的组装，考察磁性粒子在外磁场条件下，磁性纳米粒子的组装行为，并研究磁性组装基元表面Zeta电位、组装形式等对组装结构和性能的影响，从而为磁性组装构建环境响应性多功能组装研究提供新的思路。