报告简介 (Abstract)

Spontaneous self-assembly of block copolymer (BCP) molecules in a block-selective solvent typically results in the formation of micelles possessing a classical spherical morphology. Inclusion of a crystallizable block in the copolymer promotes crystallization-driven self-assembly, yielding anisotropic cylindrical micelles that can, after additional processing, possess a remarkably narrow length polydispersity. Additional coordination of palladium metal centers to phosphine ligands immobilized within the soluble coronas of BCP micelles induces intermicellar crosslinking, affording stable linear nanofibers comprised of micelle subunits. A comparable hierarchical self-assembly strategy yields toroidal micelles that combine to form micron-scale superstructures. Addition of a crystallizable BCP to a solution of a toroid-forming BCP results in the formation of toroidal multimicelles, as well as layered hexagonal arrays of connected toroids. These studies demonstrate that self-assembly of BCPs into discrete, non-spherical nanostructures can be scaled-up to yield materials with intriguing morphologies and potentially new properties.

报告人简介：

Richard J. Spontak is a Distinguished Professor in Chemical & Biomolecular Engineering and Materials Science & Engineering at North Carolina State University. He received his Ph.D. in Chemical Engineering from the University of California at Berkeley and then pursued post-doctoral research in Materials Science & Metallurgy at the University of Cambridge (U.K.) and Condensed Matter Physics at the Institute for Energy Technology (Norway) before joining the Corporate Research Division of the Procter & Gamble Company in 1990. In 1992, he accepted a faculty position at North Carolina State University, where he has supervises the Macromolecular Materials & Morphology Group. Since that time, Spontak has published over 270 peer-reviewed journal papers and another 30 scholarly works as book chapters and invited monographs, and his work has been featured on 29 journal covers and cited over 11,000 times according to Google Scholar. He is the recipient of numerous honors and awards such as the 2006 American Chemical Society (PMSE Division) Cooperative Research Award, the 2007 German Society for Electron Microscopy Ernst Ruska Prize, the 2008 American Chemical Society (Rubber Division) Chemistry of Thermoplastic Elastomers Award, the 2011 Institute of Materials, Minerals and Mining (IOM3) Colwyn Medal, the 2012 Norwegian University of Science & Technology Lars Onsager Medal, and the 2015 Society of Plastics Engineers International Award. An elected fellow of the American Physical Society, IOM3 and the Royal Society of Chemistry, he is a member of the Norwegian Academy of Technological Sciences.

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