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長春應化所姜偉研究員作客第628期化苑講壇

作者:  發(fā)布:2023-04-18 09:20:11  點擊量:

化苑講壇第628

報告題目:Polyhedral Colloidal Clusters Assembled in Deformable Emulsion Droplets

報告人:姜偉 研究員

報告時間:20230420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(fā)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.


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