【24th.Oct.】Non-classical ordered phases of block copolymers
日期：2019-10-24
阅读：682
题目：Non-classical ordered phases of block copolymers
报告人：An-Chang Shi, Department of Physics & Astronomy, McMaster University, Canada
时间：2019年10月24日9:30
地点：化学A楼518会议室
邀请人：周永丰 教授，于春阳 副研究员
报告人简介：
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史安昌，加拿大麦克马斯特大学物理和天文系教授，复旦大学长江讲座教授。1978年至1982年就读于复旦大学物理系，获学士学位；1983年经CUSPEA赴美国伊利诺大学 (University of Illinois at Urbana-Champaign) 学习，1988年获该校博士学位。1988年至1992年任加拿大麦克马斯特大学材料研究所博士后；1992年至1999年任加拿大施乐研究中心（Xerox Research Centre of Canada）研究员；1999年至2004年任加拿大麦克马斯特大学副教授，2004年至今任该校教授。2000年获得安大略省长杰出研究奖。2010年获选美国物理学会 Fellow。主要从事统计物理，软物质，生物物理等方面的研究。其主要研究领域包括高分子统计力学理论，嵌段高分子系统的相变理论，及有序-有序相转变理论。
Abstract：
The observation of ordered phases in hard-condensed matter systems such as metallic alloys has a long history in materials physics. In recent years, intricate periodic and aperiodic order has emerged in a host of soft matter systems including supramolecular assemblies, surfactants and block copolymers. The emergence of complex ordered phases in these diverse systems underscores the universality of emergent order in condensed matter. Due their rich phase behavior, block copolymers provide an ideal system to study the origins and stability of periodic and aperiodic order in condensed matter physics. In particular, recent experimental and theoretical studies have revealed that non-classical ordered phases, such as the Frank-Kasper phases and quasicrystals, could be self-assembled from block copolymers as equilibrium or metastable morphologies. We have examined the occurrence of complex spherical packing phases in block copolymer systems using the self-consistent field theory and showed that a key mechanism of forming complex spherical phases is the conformational asymmetry of the blocks. Furthermore, we have predicted that the segregation of different polymeric species in block copolymer blends provides another mechanism to stabilize spherical packing phases with very different sized-spherical domains. In my presentation, I will summarize recent theoretical and experimental progresses on this fascinating topic and discuss possible future research directions.
