Three-Dimensional Imaging of Colloidal Glasses under Steady Shear

by: R Besseling, Eric R Weeks, AB Schofield, WCK Poon

Physical Review Letters, Vol. 99, No. 2. (2007), pp. 028301-028301.

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Abstract

Using fast confocal microscopy we image the three-dimensional dynamics of particles in a yielded hard-sphere colloidal glass under steady shear. The structural relaxation, observed in regions with uniform shear, is nearly isotropic but is distinctly different from that of quiescent metastable colloidal fluids. The inverse relaxation time alpha-1" align="middle"> and diffusion constant D, as functions of the local shear rate , show marked shear thinning with alpha-1" align="middle">D0.8 over more than two decades in . In contrast, the global rheology of the system displays Herschel-Bulkley behavior. We discuss the possible role of large scale shear localization and other mechanisms in generating this difference.

@article{besseling07, abstract = {Using fast confocal microscopy we image the three-dimensional dynamics of particles in a yielded hard-sphere colloidal glass under steady shear. The structural relaxation, observed in regions with uniform shear, is nearly isotropic but is distinctly different from that of quiescent metastable colloidal fluids. The inverse relaxation time alpha-1" align="middle"> and diffusion constant D, as functions of the local shear rate , show marked shear thinning with alpha-1" align="middle">D0.8 over more than two decades in . In contrast, the global rheology of the system displays Herschel-Bulkley behavior. We discuss the possible role of large scale shear localization and other mechanisms in generating this difference.}, author = {Besseling, R. and Weeks, Eric R. and Schofield, A. B. and Poon, W. C. K. }, citeulike-article-id = {1676527}, doi = {http://dx.doi.org/10.1103/PhysRevLett.99.028301}, journal = {Physical Review Letters}, keywords = {dyn-het}, number = {2}, pages = {028301}, posted-at = {2007-09-19 17:32:38}, priority = {0}, publisher = {APS}, title = {Three-Dimensional Imaging of Colloidal Glasses under Steady Shear}, url = {http://dx.doi.org/10.1103/PhysRevLett.99.028301}, volume = {99}, year = {2007} }

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TY - JOUR ID - besseling07 L3 - citeulike-article-id:1676527 TI - Three-Dimensional Imaging of Colloidal Glasses under Steady Shear JF - Physical Review Letters VL - 99 IS - 2 SP - 028301 EP - 028301 PB - APS N2 - Using fast confocal microscopy we image the three-dimensional dynamics of particles in a yielded hard-sphere colloidal glass under steady shear. The structural relaxation, observed in regions with uniform shear, is nearly isotropic but is distinctly different from that of quiescent metastable colloidal fluids. The inverse relaxation time alpha-1" align="middle"> and diffusion constant D, as functions of the local shear rate , show marked shear thinning with alpha-1" align="middle">D0.8 over more than two decades in . In contrast, the global rheology of the system displays Herschel-Bulkley behavior. We discuss the possible role of large scale shear localization and other mechanisms in generating this difference. KW - dyn-het AU - Besseling, R AU - Weeks, Eric AU - Schofield, AB AU - Poon, WCK PY - 2007/// UR - http://dx.doi.org/10.1103/PhysRevLett.99.028301 ER -

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