化苑讲坛第628期

报告题目：Polyhedral Colloidal Clusters Assembled in Deformable Emulsion Droplets

报告人：姜伟 研究员

报告时间：2023年04月20日（周四）上午9:00-10:30

报告地点：化学楼二楼一号会议室

个人简介：

姜伟，中国科学经理春应用化学研究所研究员，博士生导师，主要从事高性能高分子材料的制备、高分子结构与性能关系研究。作为项目负责人先后承担了国家自然科学基金12项（包括重点、重点群、重大子课题、杰青、国际合作和面上）、国家十三五重点研发计划项目1项。2007年获得国家自然科学杰出青年基金。

报告简介：

Tetrahedral colloidal clusters assembled from amphiphilic nanoparticles in deformable emulsion droplets for the first time. The nanoparticles were grafted with two polymers, i.e., hydrophobic polystyrene (PS) and hydrophilic poly (2-vinyl pyridine) (P2VP). It is found that icosahedral, anti-icosahedral, spherical, and tetrahedral colloidal clusters can be obtained by tuning the molar ratio of PS to P2VP tethered on the particle and the amount of small molecule surfactant. At a lower ratio of P2VP to PS, the particles gradually assemble into spherical, anti-icosahedral, and icosahedral clusters by increasing the surfactant amount rather than by increasing the number of particles, as reported. However, the particles assemble into tetrahedral colloidal clusters with a perfect face-centered cubic (FCC) lattice structure at a higher ratio of P2VP to PS. It is revealed that the droplet interface energy and its variation with time determine which polyhedral colloidal cluster can be assembled.