超分子功能凝胶体系中Fe3O4磁纳米晶的控制生长与性能优化

项目名称： 超分子功能凝胶体系中Fe3O4磁纳米晶的控制生长与性能优化

项目编号： No.21206118

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 化学工程及工业化学

项目作者： 唐韶坤

作者单位： 天津大学

项目金额： 27万元

中文摘要： 超分子功能材料凝胶体系具有易于调控的纤维网状结构，是纳米可控合成的理想模板。本项目针对磁纳米Fe3O4现有合成方法的缺陷，以具有纳米级三维纤维网络结构的功能凝胶为模板合成纳米Fe3O4。通过调控凝胶的微观网络结构如孔道尺寸、交联度等调节纳米晶的形貎，利用模板的纤维生长取向和离子选择吸附性诱导纳米晶的取向生长，实现纳米晶的控制合成与性能优化，以期最终获得形貌规整、磁性能优异的功能化纳米Fe3O4；探究成胶条件、反应条件等因素对纳米晶成核与生长的影响规律，揭示超分子凝胶体系诱导纳米晶成核生长的模板作用机理。本项目建立了纳米可控合成的新思路，有望将凝胶体系的基础研究和应用拓展至更广泛的领域。

中文关键词： 凝胶；纳米材料；Fe3O4；合成；机理

英文摘要： Supramolecular functional material - gel system can act as an ideal template for controlled synthesis of nanoparticles based on its tunable fiber network. Aiming at the shortages of current synthesis methods, Fe3O4 nanoparticles will be fabricated within three-dimensional gel nanofiber network as a template in this research. The topology of fiber network including pore size, crosslink degree and so on can control and tune structures of nanocrystals, and the growth direction of fibers and selective ion adsorption of the gel network can induce orientated growth of nanocrystals. As a result, functionalized Fe3O4 nanoparticles with uniform appearance and excellent magnetic performance will be anticipated to achieve by the aid of gel network. Influences of gelation conditions and reaction conditions on nanocrystal nucleation and growth will be investigated, and furthermore, template mechanism of gel network how to induce crystal nucleation and growth will be disclosed. A new approach to controlled synthesis of nanoparticles will be identified in this research, and can be attempted to extend to other systems.

英文关键词： gel；nanomaterials；magnetite；synthesis；mechanism