软粒子分散系介电模型的构建及界面信息的介电谱表征

项目名称： 软粒子分散系介电模型的构建及界面信息的介电谱表征

项目编号： No.21473012

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 有机化学

项目作者： 赵孔双

作者单位： 北京师范大学

项目金额： 80万元

中文摘要： 软粒子在胶体、生物材料、催化等领域都具有很深的应用背景，然而，目前的研究大都集中在制备和表征上，而很少关注软粒子体系中与界面现象相关的物理化学问题，现有的研究也是半定量的，其瓶颈在于其实验基础的局限性：建立在静电学基础上的测量和解析难以获取更多的复杂体系内部的信息。本项目提出用介电弛豫谱方法探测新型软粒子内部各种信息，基于交流电场下的基本原理，结合了静电学的基本理论，在现有描述核壳结构粒子界面电动力学性质的Possion-Boltzman方程和Navier-stokes方程中加入软层的特征量，建立了介电谱可获得的复电导率与模型中的界面电势分布等参数表达式之间的关联；通过将程序化的模型与详尽解析的介电参数相结合，得到需要很多单独的实验才可以获得的粒子结构、介质以及粒子和介质界面处的电动力学信息，为开发新型材料提供理论依据。将该方法拓展至软粒子的在线监测，为介电谱表征方法提供一种新思路。

中文关键词： 球形聚电解质刷；介电谱；理论模拟；粒子稳定性

英文摘要： Soft particles have been applied in many fields such as colloids, multifunctional materials, medicine, catalysis and synthesis. Most of its studies are focus on preparation and characterization; however, rarely contribute to the basic problems, e.g. the physical properties of interface in soft particle suspensions. In this project, dielectric spectroscopy is used to study the inner information of soft particles. We bring characteristic quantity of soft layers in Possion-Boltzman and Navier-stokes equations to modify the dielectric models of hard-particles and core-shell particles, and then obtain the relationship between complex conductivity, which can be gained by dielectric measurement, and interface electric potential distributions in modified models. Much information such as soft particle structures, electrodynamic properties of interface between particles and medium are always measured traditionally by individual experimental technique. However, combining the modified models and dielectric parameters that obtained by dielectric analysis, these information can be acquired superiorly. Moreover, the analysis method used in project will be expanded into the application of on-line monitoring of soft particles suspensions.

英文关键词： Spherical Polyelectrolyte Brushes (SPBs);dielectric spectroscopy;theory simulation;particles stability