Levich Institute Seminar Announcement, 05/02/2006

Tuesday, 05/02/2006
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Professor David Reichman
Columbia University
Chemistry Department

"Physical Gelation in Colloidal Suspensions"

ABSTRACT


I discuss the interesting physics of colloidal suspensions that, upon the addition of a controlled amount of polymer, may interact through very short-ranged attractions, in addition to their hard-core repulsions. At high volume fractions, such suspensions display two glassy phases, one controlled by the hard-core repulsion, and one controlled by the short-range attraction. At lower volume fractions it has been proposed that porous gels are simply the continuation of the attractive glass phase to lower volume fractions. I critically analyze this claim, discussing the complications of residual charge on the colloids, as well as phase and micro-phase separation.

BRIEF ACADEMIC/EMPLOYMENT BACKGROUND:

BA, Physics, U. Chicago (1992). PhD, Theoretical Chemistry, MIT (1997). Assistant-Full Professor, Harvard University (1999-2004). Full Professor, Columbia University (2004-Present).