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长春应化所姜伟研究员作客第628期化苑讲坛

作者:  发布:2023-04-18 09:20:11  点击量:

化苑讲坛第628

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

报告人:姜伟 研究员

报告时间:20230420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,中国科学院长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.


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