Volume 75, Number 6, September 2006
|Page(s)||915 - 921|
|Section||Condensed matter: structural, mechanical and thermal properties|
|Published online||09 August 2006|
Nonlinear viscoelasticity of metastable complex fluids
Department of Chemistry, Columbia University 3000 Broadway, New York, NY 10027, USA
2 Department of Physics & DEAS, Harvard University - Cambridge, MA 02138, USA
Accepted: 21 July 2006
Many metastable complex fluids such as colloidal glasses and gels show distinct nonlinear viscoelasticity with increasing oscillatory-strain amplitude; the storage modulus decreases monotonically as the strain amplitude increases whereas the loss modulus has a distinct peak before it decreases at larger strains. We present a qualitative argument to explain this ubiquitous behavior and use mode-coupling theory (MCT) to confirm it. We compare theoretical predictions to the measured nonlinear viscoelasticity in a dense hard-sphere colloidal suspension; reasonable agreement is obtained. The argument given here can be used to obtain new information about linear viscoelasticity of metastable complex fluids from nonlinear strain measurements.
PACS: 64.70.Pf – Glass transitions / 83.60.Rs – Shear rate-dependent structure (shear thinning and shear thickening) / 83.80.Hj – Suspensions, dispersions, pastes, slurries, colloids
© EDP Sciences, 2006
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