COLÓQUIO - Drop-based microfluidics: Biology a picoliter at a time

Data de Início: 
quinta-feira, 11 Outubro, 2012 - 16:00
Palestrante: 
Prof. Davi A. Weitz - School of Engineering and Applied Sciences/Department of Physics Harvard University, Cambridge, USA
Local: 
Auditório Abrahão de Moraes - Instituto de Física da USP

Networks of aggregated colloidal particles are solidlike and can sustain an applied shear stress while exhibiting little or no creep; however, ultimately they will catastrophically fail. We show that the time delay for this yielding decreases in two distinct exponential regimes with applied stress. This behavior is universal and found for a variety of colloidal gel systems. We present a bond-rupture model that quantitatively describes this behavior and highlights the role of mesoscopic structures. Our result gives new insight into the nature of yielding in these soft solid materials.

ENTRADA FRANCA
VIDEO NO SITE IPTV-USP:clique aqui
Como chegar na USP: clique aqui

 

Desenvolvido por IFUSP