化苑講壇第628期
報告題目：Polyhedral Colloidal Clusters Assembled in Deformable Emulsion Droplets
報告人：姜偉 研究員
報告時間：2023年04月20日（周四）上午9:00-10:30
報告地點：化學樓二樓一號會議室
個人簡介：
姜偉，中國科學院長春應用化學研究所研究員，博士生導師，主要從事高性能高分子材料的制備、高分子結構與性能關系研究。作為項目負責人先后承擔了國家自然科學基金12項（包括重點、重點群、重大子課題、杰青、國際合作和面上）、國家十三五重點研發計劃項目1項。2007年獲得國家自然科學杰出青年基金。
報告簡介：
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.
