Imaging the Microscopic Structure of Shear Thinning and Thickening Colloidal Suspensions

Handle URI:
http://hdl.handle.net/10754/598559
Title:
Imaging the Microscopic Structure of Shear Thinning and Thickening Colloidal Suspensions
Authors:
Cheng, X.; McCoy, J. H.; Israelachvili, J. N.; Cohen, I.
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.
Citation:
Cheng X, McCoy JH, Israelachvili JN, Cohen I (2011) Imaging the Microscopic Structure of Shear Thinning and Thickening Colloidal Suspensions. Science 333: 1276–1279. Available: http://dx.doi.org/10.1126/science.1207032.
Publisher:
American Association for the Advancement of Science (AAAS)
Journal:
Science
KAUST Grant Number:
KUS-C1-018-02
Issue Date:
1-Sep-2011
DOI:
10.1126/science.1207032
PubMed ID:
21885778
Type:
Article
ISSN:
0036-8075; 1095-9203
Sponsors:
We 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.
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Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorCheng, X.en
dc.contributor.authorMcCoy, J. H.en
dc.contributor.authorIsraelachvili, J. N.en
dc.contributor.authorCohen, I.en
dc.date.accessioned2016-02-25T13:32:09Zen
dc.date.available2016-02-25T13:32:09Zen
dc.date.issued2011-09-01en
dc.identifier.citationCheng X, McCoy JH, Israelachvili JN, Cohen I (2011) Imaging the Microscopic Structure of Shear Thinning and Thickening Colloidal Suspensions. Science 333: 1276–1279. Available: http://dx.doi.org/10.1126/science.1207032.en
dc.identifier.issn0036-8075en
dc.identifier.issn1095-9203en
dc.identifier.pmid21885778en
dc.identifier.doi10.1126/science.1207032en
dc.identifier.urihttp://hdl.handle.net/10754/598559en
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
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
dc.publisherAmerican Association for the Advancement of Science (AAAS)en
dc.titleImaging the Microscopic Structure of Shear Thinning and Thickening Colloidal Suspensionsen
dc.typeArticleen
dc.identifier.journalScienceen
dc.contributor.institutionCornell University, Ithaca, United Statesen
dc.contributor.institutionColby College, Waterville, United Statesen
dc.contributor.institutionUniversity of California, Santa Barbara, Santa Barbara, United Statesen
kaust.grant.numberKUS-C1-018-02en

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