Volume 75, Number 4, August 2006
|Page(s)||624 - 630|
|Section||Interdisciplinary physics and related areas of science and technology|
|Published online||12 July 2006|
Yielding of colloidal glasses
SUPA, School of Physics, University of Edinburgh Mayfield Road, Edinburgh EH9 3JZ, UK
2 Institute of Electronic Structure and Laser-FORTH PO Box 1527, Heraklion 71110, Crete, Greece
3 University of Crete, Department of Materials Science and Technology Heraklion, Crete, Greece
Accepted: 29 June 2006
We studied yielding in two kinds of colloidal glasses: hard spheres at high concentrations without and with a short-range interparticle attraction induced by adding non-adsorbing polymer. Our oscillatory shear and step strain measurements reveal single and two-step yielding in these two kinds of glasses, respectively. This finding is interpreted in terms of a simple picture: the breaking of local topological constraints (cages) and the breaking of nearest-neighbour bonds.
PACS: 82.70.Dd – Colloids / 83.50.-v – Deformation and flow / 83.80.Hj – Suspensions, dispersions, pastes, slurries, colloids
© EDP Sciences, 2006
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