Levich Institute Seminar Announcement, 02/03/2009
Tuesday, 02/03/2009
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Professor Jason Butler
University of Florida
Department of Chemical Engineering

"Dynamics and Migration of Confined Polymers Driven by Shearing Flows and Electrophoresis"


ABSTRACT


Polymers in dilute solution can experience a net migration across streamlines in bounded shear and pressure-driven flows. Though the origin, existence, and even direction of polymer migration were controversial, recent work has clarified that flexible polymers migrate away from bounding walls due to hydrodynamic interactions if `weakly' confined. For `highly' confined polymers, the hydrodynamic interactions are screened and the polymers migrate closer to the wall. I compare simulations of the phenomena to calculations from the kinetic theory of an elastic dumbbell to elucidate the origin of the behavior. The possibility of using the phenomena in conjunction with electrophoresis to control the distribution of, and possibly separate, polyelectrolytes is explored. The results of simulations and theory on this combined mechanism are in good agreement with one another, and in qualitative agreement with experimental observations. I also present both computational and theoretical investigations of the migration behavior for rigid, rod-like polymers.

BRIEF ACADEMIC/EMPLOYMENT BACKGROUND:

  • PhD at University Texas Austin in 1998
  • Post-doc at Stanford for 1999-2000
  • Chateaubriand Fellowship in 2000, worked at Marseille Polytech
  • Began work at University of Florida in 2001
  • Career award in 2003
  • Promoted to Associate Professor in 2007

CURRENT RESEARCH INTERESTS:

Performing research on dynamics of complex fluids with recent work focusing on dynamics/rheology of rigid fibers, rheology/migration in concentrated suspensions of non-colloidal spheres, macromolecules flowing through microfluidic devices, and instabilities in sedimenting suspension systems.