Dept. of Materials Science & Engineering, Dept. of Chemical Engineering, University of Michigan
Self-assembly and physical properties of polymer metallic nanoparticle thin film systems
Location: EB I Room 1011
Friday, April 12th 2013 - 11:00 am
Nanocomposites produced through the incorporation of nanoparticles of varying types, from quantum dots and fullerenes to nanowires and clays, into polymer hosts are known to exhibit properties that differ substantially from those of the polymer. The diverse functional properties exhibited by these polymer nanocomposites (PNCs) depend on the molecular characteristics of the polymer, the size, dimension and chemistry of the nanoparticles, and the spatial organization of the nanoparticles within the polymer host. The primary challenge associated with the performance of PNCs is that the spatial distribution of the nanoparticles is difficult to control. A unified picture of how various competing interactions at the nanoscale determine the structure and properties of PNCs remains elusive.
In this presentation we show that a promising strategy for controlling the spatial distribution of metallic nanoparticles within a polymer host, and hence the properties, involves grafting chains onto the surfaces of nanoparticles of varying sizes. We have developed rules to design and to fabricate thin films of different morphologies of this class of PNCs. I will present: (1) examples of phase diagrams of thin film polymer/nanoparticle systems; (2) self-assembly of nanoparticles in homopolymers and block copolymers; (3) strategies to "tailor" the refractive indices of thin film PNCs.
Peter F. Green is the Vincent T. and Gloria M. Gorguze Professor of Engineering and Chair of the Materials Science and Engineering Department at the University of Michigan, Ann Arbor. He is also Professor of Chemical Engineering and Applied Physics. Prof. Green is also Director of the Center for Solar and Thermal Energy Conversion (CSTEC), a DOE Energy Frontier Research Center (EFRC
Professor Green was the 2006 President of the Materials Research Society (MRS). He is a Fellow of the Royal Society of Chemistry (London) and a Fellow of the American Physical Society and a Fellow of the American Ceramics Society. He is Editor-in-Chief of Materials Communications, Cambridge University Press/Materials Research Society.
Green's research group (http://www.greengroup.engin.umich.edu/) investigates fundamental questions the structure and properties of "soft" material based systems for applications that include: energy conversion, active and passive coatings, membranes, sensors, electrorheology and organic electronics. He earned his doctorate in Materials Science and Engineering from Cornell University on 1985, his MS from Cornell in the same field; in 1981 he earned both MA and BA (Honors) degrees in Physics from Hunter College, N.Y.