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Colloidal gels under shear: Strain rate effects

Koumakis, N. and Ballesta, P. and Besseling, R. and Poon, W. C. K. and Brady, J. F. and Petekidis, G. (2013) Colloidal gels under shear: Strain rate effects. In: 4th International Symposium on Slow Dynamics in Complex Systems. AIP Conference Proceedings. No.1518. American Institute of Physics , Melville, NY, pp. 365-371.

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Attractive colloidal particles are trapped in metastable states such as colloidal gels at high attraction strengths and attractive glasses and high volume fractions. Under shear such states flow via a two step yielding process that relates to bond and cluster or cage breaking. We discuss the way the structural properties and related stress response are affected by the shear rate. At low rates colloidal gels yield during start-up shear essentially in a single step, exhibiting a single stress overshoot due to creation of compact flowing clusters. With increasing shear rate a second stress overshoot, linked with further cluster breaking up to individual particles, is becoming more pronounced. We further present the age dependence of the two step yielding and wall slip effects often taking place during rheological experiments of colloidal gels. The latter is related both with the shear rate dependent gel structure as well as the time evolution of the near wall structure.

Item Type:Book Section
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URLURL TypeDescription
Brady, J. F.0000-0001-5817-9128
Additional Information:© 2013 American Institute of Physics. Published online 25 February 2013. We thank A. B. Schofield for particle synthesis. We acknowledge EU funding through ToK 'Cosines' (MTCD-CT-2005-029944) and FP7 'Nanodirect' (NMP4-SL-2008-213948).
Funding AgencyGrant Number
European UnionMTCD-CT-2005-029944
European UnionNMP4-SL-2008-213948
Subject Keywords:Colloidal gels, Colloid-polymer mixtures, Yielding, Wall Slip.
Series Name:AIP Conference Proceedings
Issue or Number:1518
Classification Code:82.70.Dd, 64.70.pv, 83.10.Mj, 83.80.Hj
Record Number:CaltechAUTHORS:20160421-134819663
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66371
Deposited By: Ruth Sustaita
Deposited On:21 Apr 2016 21:11
Last Modified:10 Nov 2021 23:57

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