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Please use this identifier to cite or link to this item: http://hdl.handle.net/1813/30467
Title: Imaging the microscopic structure of shear thinning and thickening colloidal suspension
Authors: Cheng, X.
McCoy, J.H.
Israelachvili, J.N.
Cohen, I.
Keywords: CONCENTRATED SUSPENSIONS
DENSE SUSPENSIONS
RHEOLOGY
FLOW
DISPERSIONS
SIMULATION
SPHERES
Issue Date: 2-Sep-2011
Publisher: AMERICAN ASSOCIATION ADVANCEMENT SCIENCE
Citation: Science 2 September 2011: Vol. 333 no. 6047 pp. 1276-1279 DOI: 10.1126/science.1207032
Abstract: The viscosity of colloidal suspensions varies with shear rate, an important effect encountered in many natural and industrial processes. Although this non-Newtonian behavior is believed to arise from the arrangement of suspended particles and their mutual interactions, microscopic particle dynamics are difficult to measure. By combining fast confocal microscopy with simultaneous force measurements, we systematically investigate a suspension's structure as it transitions through regimes of different flow signatures. Our measurements of the microscopic single-particle dynamics show that shear thinning results from the decreased relative contribution of entropic forces and that shear thickening arises from particle clustering induced by hydrodynamic lubrication forces. This combination of techniques illustrates an approach that complements current methods for determining the microscopic origins of non-Newtonian flow behavior in complex fluids.
Related Version: http://www.sciencemag.org/content/333/6047/1276.full
URI: http://hdl.handle.net/1813/30467
ISSN: 0036-8075
Appears in Collections:Energy and Sustainability Publications

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