报告题目：Functional 1D and 2D Nano- and Microparticles via “Living” Crystallization-Driven Self-Assembly
Fellow of the RoyalSociety of London
Fellow to the RoyalSociety of Canada
European Union MarieCurie Chair
Ian Manners was bornin London, England and, after receiving his Ph.D. from the University ofBristol, he conducted postdoctoral work in Germany and then in the USA. Hejoined the University of Toronto, Canada as an Assistant Professor in 1990 andwas promoted to Full Professor in 1995 and was made a Canada Research Chair in2001. In 2006 he returned to his Alma Mater to take up a Chair in Inorganic,Macromolecular and Materials Chemistry supported by an EU Marie Curie Chair. In2018 he was awarded a Canada 150 Research Chair and will take up a position atthe University of Victoria, Canada in the next year.
Ian’s researchinterests broadly focus on synthetic problems at molecular, macromolecular, andlonger length scales. His current research projects include: catalytic maingroup chemistry and main group polymers, functional metallopolymers,crystallization-driven self-assembly of block copolymers, nanoelectronics withsoft materials, and biological-synthetic hybrids based on DNA and viruses. Heis the recipient of a range of awards including a Alfred P. Sloan Fellowship (fromthe US), the Steacie Prize (from Canada), the RSC Award in Main GroupChemistry, and a Humboldt Research Award from Germany. Most recently hereceived RSC de Gennes Prize (2017).
His work is documentedin ca. 670 career publications and 4 books and has been presented in ca. 560invited lectures worldwide. He has a current h-index of 89 (Web of Science) andhis work has received over 24,000 citations from other scientists. He is anelected member of both the Canadian and the British National Academies of Science.
Molecular, and more recently,macromolecular synthesis has evolved to an advanced state allowing the creationof remarkably complex organic molecules and well-defined polymers with typicaldimensions from 0.5 nm - 10 nm. In contrast, the ability to prepare materialsin the 10 nm – 100 micron size regime with controlled shape, dimensions, andstructural hierarchy is still in its relative infancy and currently remains thevirtually exclusive domain of biology.
In this talk recent developmentsconcerning a promising “seeded growth” route to well-defined 1D and 2D nano-and microparticles termed “living” crystallization-driven self-assembly (CDSA),will be described. Living CDSA can be regarded as a type of “livingsupramolecular polymerization” that is analogous to living covalent (e.g. anioninitiated) polymerizations of molecular monomers but on a much longer lengthscale (typically, 10 nm – 5 microns). Living CDSA also shows analogies to biological“nucleation-elongation” processes such as amyloid fiber growth.
The building blocks or “monomers”used for living CDSA consist of a rapidly expanding range of crystallizableblock copolymers, homopolymers with charged termini, or planar ?-stackingmolecules with a variety of chemistries. The seeds used as “initiators” forliving CDSA are usually prepared from preformed polydisperse 1D or 2D micellesby sonication. As a useful alternative, they can be formed in situ in solutionby thermal treatment and/or by using conditions of controlled solvency. The “insitu” method is termed 1D or 2D “self-seeding” and has its origins in earlywork on the growth of polymer single crystals.
Recent results indicate thatthrough combination with the polymerization-induced self-assembly (PISA)method, living CDSA is scalable and therefore offers the potential to prepareuniform samples of 1D and 2D nanoparticles and hierarchical materials withpotential applications in areas such as optoelectronics, catalysis, and biomedicine.Recent examples of work by our group and our collaborators, and also by otherworkers in the field, will be discussed.