Member of the Canadian and British National Academies of Science School of Chemistry, University of Bristol, UK 报告题目 Crystallization-Driven, Seeded Growth Approaches to Functional Supramolecular Materials
报告时间 2016年4月5日 (星期二) 上午9:30
报告地点 环境资源楼939会议室
报告内容
Although chemical synthesis has evolved to a relatively advanced state, the ability to prepare well-defined materials of controlled shape, size, and structural hierarchy on a length scale from 10 nm – 100 microns is still in its relative infancy and currently remains the virtually exclusive domain of biology. In this talk a promising new route to well-defined 1D and 2D materials within this size regime, termed “living crystallization-driven living self-assembly” (CDSA), will be described. This approach was discovered as a result of an investigation of the solution self-assembly behavior of block copolymers with crystallizable polyferrocenylsilane (PFS) metalloblocks.
The “seeded growth” characteristic of living CDSA means that the process can be regarded as a type of “living supramolecular polymerization” that is analogous to living covalent (e.g. anionic) polymerizations of molecular monomers. Thus, living CDSA offers a versatile new route to monodisperse cylindrical micelles and 2D platelets, block comicelles with segmented non-equilibrium structures, and complex, hierarchical materials with controlled dimensions and a variety of potential applications[1-5]. The process is performed under conditions that yield kinetically-trapped non-covalent assemblies in which potential dynamic behavior is switched off. Seeded growth approaches characteristic of living CDSA appear to be applicable to a wide range of other block copolymers with crystallizable blocks, including biodegradable and pi-conjugated materials, and also to molecular amphiphiles that form pi-stacked supramolecular polymeric assemblies.
The “seeded growth” characteristic of living CDSA means that the process can be regarded as a type of “living supramolecular polymerization” that is analogous to living covalent (e.g. anionic) polymerizations of molecular monomers. Thus, living CDSA offers a versatile new route to monodisperse cylindrical micelles and 2D platelets, block comicelles with segmented non-equilibrium structures, and complex, hierarchical materials with controlled dimensions and a variety of potential applications[1-5]. The process is performed under conditions that yield kinetically-trapped non-covalent assemblies in which potential dynamic behavior is switched off. Seeded growth approaches characteristic of living CDSA appear to be applicable to a wide range of other block copolymers with crystallizable blocks, including biodegradable and pi-conjugated materials, and also to molecular amphiphiles that form pi-stacked supramolecular polymeric assemblies.
References:
1) J.B. Gilroy et al Nature Chem. 2010, 2, 566.
2) P.A. Rupar et al Science 2012, 337, 559.
3) Z.M. Hudson, C.E. Boott et al Nature Chem. 2014, 6, 8934.
4) H. Qiu et al Science 2015, 347,1329.
5) X. Li, Y. Gao et al Nature Comm. 2015, 6, 8127.
6) H. Qiu, Y. Gao et al Science 2016, in press.
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