Slip of glassy hard-sphere colloidal suspensions
- Event time: 1:00pm
- Event date: 11th February 2008
- Speaker: Pierre Ballesta (University of Edinburgh)
- Location: Room 2511, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB
Using a novel combination of confocal microscopy in a cone-plate rheometer, we image the slip and flow of dense colloidal hard-sphere suspensions along smooth walls. Above the glass transition, the global rheology exhibits a crossover from Bingham-like slip behavior at small applied shear rates to a Herschel-Bulkley response at large rate. Imaging shows that the slip to shear transition is strongly position dependent and a simple phenomenological model captures both the local and global rheology.
This is a weekly series of informal talks given primarily by members of the soft condensed matter and statistical mechanics groups, but is also open to members of other groups and external visitors. The aim of the series is to promote discussion and learning of various topics at a level suitable to the broad background of the group. Everyone is welcome to attend..