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Imaging the microscopic structure of shear thinning and thickening colloidal suspension

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dc.contributor.authorCheng, X.
dc.contributor.authorMcCoy, J.H.
dc.contributor.authorIsraelachvili, J.N.
dc.contributor.authorCohen, I.
dc.date.accessioned2012-10-11T16:20:30Z
dc.date.available2012-10-11T16:20:30Z
dc.date.issued2011-09-02
dc.description.abstractThe 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.en_US
dc.description.sponsorshipWe thank T. Beatus, Y.-C. Lin, J. Brady, L. Ristroph, and N. Wagner for useful discussions. This research was supported by grants from NSF Civil, Mechanical, and Manufacturing Innovation, Division of Materials Research (DMR), and DMR Materials Research Science and Engineering Centers, and in part by award KUS-C1-018-02 from King Abdullah University of Science and Technology (KAUST). J.N.I. was supported by the U.S. Department of Energy, Division of Materials Sciences and Engineering under award DE-FG02-87ER-45331.en_US
dc.identifier.citationScience 2 September 2011: Vol. 333 no. 6047 pp. 1276-1279 DOI: 10.1126/science.1207032en_US
dc.identifier.issn0036-8075
dc.identifier.otherDOI: 10.1126/science.1207032
dc.identifier.urihttps://hdl.handle.net/1813/30467
dc.language.isoen_USen_US
dc.publisherAMERICAN ASSOCIATION ADVANCEMENT SCIENCEen_US
dc.relation.hasversionhttp://www.sciencemag.org/content/333/6047/1276.fullen_US
dc.subjectCONCENTRATED SUSPENSIONSen_US
dc.subjectDENSE SUSPENSIONSen_US
dc.subjectRHEOLOGYen_US
dc.subjectFLOWen_US
dc.subjectDISPERSIONSen_US
dc.subjectSIMULATIONen_US
dc.subjectSPHERESen_US
dc.titleImaging the microscopic structure of shear thinning and thickening colloidal suspensionen_US
dc.typearticleen_US

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