Levich Institute Seminar Announcement, 03/15/2011
Tuesday, 03/15/2011
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

Dr. Thomas Hu
Unilever
Structured Materials Group

"Shear Banding in Entangled Polymers: Real or Artificial? "


ABSTRACT


Whether entangled polymers shear band, particularly in the steady state, is a fundamental and much pursued issue in polymer rheology. We have investigated this problem using particle tracking velocimetry for various entangled systems such as conventional polymers and DNAs. I will present our experimental results and discuss whether shear banding is an inherent property of entangled systems or could be attributed to experimental artifacts such as inhomogeneous stress field from the flow geometry.

BRIEF ACADEMIC/EMPLOYMENT BACKGROUND:

I obtained my Ph.D in Macromolecular Science and Engineering in 1995 from Case Western Reserve University and went UC Santa Barbara doing postdoctoral research. I joined Unilever in 1998 and am currently a principle scientist in the Structured Materials group.

CURRENT RESEARCH INTERESTS:

Yielding and shear banding of soft glassy materials and entangled systems.