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(diǎn)：化學(xué)樓二樓一號會議室

個人簡介：

姜偉，中國科學(xué)院長春應(yīng)用化學(xué)研究所研究員，博士生導(dǎo)師，主要從事高性能高分子材料的制備、高分子結(jié)構(gòu)與性能關(guān)系研究。作為項目負(fù)責(zé)人先后承擔(dān)了國家自然科學(xué)基金12項（包括重點(diǎn)、重點(diǎn)群、重大子課題、杰青、國際合作和面上）、國家十三五重點(diǎn)研發(fā)計劃項目1項。2007年獲得國家自然科學(xué)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.