悬浮液气-液界面二元胶体颗粒的漂浮组装机理  

Mechanism of Floating Self-assembly of Binary Colloidal Particles at Water-Air Interface of Suspension

作　　者：王晓冬[1] 仪桂云[1] 董鹏[1] 陈胜利[1] 

机构地区：[1]中国石油大学(北京)重质油国家重点实验室,北京102249

出　　处：《物理化学学报》2007年第11期1707-1713,共7页Acta Physico-Chimica Sinica

基　　金：国家重点基础研究发展规划项目(973)(2004CB217808);国家自然科学基金(20473108)资助

摘　　要：提出一种在悬浮液气一液界面漂浮组装亚微米单分散聚苯乙烯(PS)微球和纳米SiO_2颗粒二元胶粒晶体的新方法,并系统研究了漂浮组装机理.研究表明,聚苯乙烯微球和二氧化硅两种胶体颗粒在悬浮液气-液界面的漂浮组装是以PS微球的组装为主导的.在一定PS微球相浓度范围内,悬浮液中PS微球与SiO_2颗粒的初始体积配比基本不影响PS微球有序组装的形成.PS微球粒径在150-500 nm时易于形成有序排列,较小或较大粒径的PS微球难以形成有序排列.SiO_2颗粒的组装是一种以PS微球为"基底"的沉积过程.二元胶粒晶体中SiO_2颗粒的体积分数由其在混合悬浮液中的相浓度所决定.The floating self-assembly of submicron monodisperse polystyrene （PS） spheres and SiO2 nanoparticles at water-air interface of suspension （floating assembly method） was presented in this article. The mechanism of this method was extensively studied. It was shown that the assembly of PS microspheres was dominant in the floating assembly of binary colloidal particles. At definite phase concentration, the formation of ordered structure of PS microspheres had nothing to do with the initial volume ratio of PS microspheres and SiO2 nanoparticles in suspension. When the diameter of PS microspheres was in the range of 150-500 nm, the ordered structure could be obtained easily, otherwise it was difficult. The self-assembly of SiO2 nanoparticles was a depositing process at the surface of PS microspheres as substrate. The volume fraction of SiO2 particles in binary colloidal crystal was determined by the phase concentration of SiO2 in suspension.

关 键 词：二元胶粒晶体 漂浮组装 聚苯乙烯微球 SiO2纳米颗粒 三维有序大孔材料 

分 类 号：O648[理学—物理化学]