Levich Institute Seminar Announcement, 12/02/2014
Steinman Hall, Room #312
(Chemical Engineering Conference Room)
Professor Lynden Archer
Department of Chemical and Biomolecular Engineering
"Nanoparticle-Polymer Hybrid Materials: Structure, Rheology and Component Dynamics "
Soft colloids have attracted significant interest as model systems for studying glassy fluid structure and dynamics. This attraction arises in part from their less fragile behavior when compared to hard sphere colloids and their ability to reach equilibrium even when in a jammed, glassy fluid state. This talk focuses on a class of soft colloids created by densely grafting oligomers to inorganic nanoparticles. These materials form stable, single-component suspensions, which allow glassy fluid physics, rheology, and structure to be studied in detail and without complications from enthalpic interactions between a solvent and the suspended phase. The talk will explore the effect of the space filling constraint on tethered polymer chains on suspension structure and will show that on length scales probed by small-angle scattering experiments, the materials exist as single-component fluids. It will also consider the effect of confinement of polymer chains to and between the surfaces of their nanometer sized particle hosts and will illustrate how the captive fluid layer on each particle leads to novel rheological and transport behaviors.
BRIEF ACADEMIC/EMPLOYMENT HISTORY
Lynden Archer is the William C. Hooey Director and Professor of Chemical and Biomolecular Engineering and co-Director of the KAUST-Cornell Center for Energy and Sustainability at Cornell University. Archer received his Ph.D. in chemical engineering from Stanford University in 1993 and the bachelors of Science degree in chemical engineering (polymer science) from the University of Southern California in 1989. He is a fellow of the American Physical Society and has been recognized with various awards, including the National Science Foundation Award for Special Creativity, the James & Mary Tien Excellence in Teaching Award, and the American Institute of Chemical Engineer's MAC Centennial Engineer and Nanoscale Science and Engineering Forum (NSEF) awards.