Nonlinear viscoelasticity of metastable complex fluids

Details Nonlinear viscoelasticity of metastable complex fluids Nonlinear viscoelasticity of metastable complex fluids

2005-09-05

arxiv.org/abs/cond-mat/0509121v3

Europhys. Lett., 75, 915- 921 (2006)

Physics

Condensed Matter

Soft Condensed Matter

7 pages, 3 figures, accepted for publication in Europhys. Lett

Scientific paper

10.1209/epl/i2006-10203-9

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 suspensions; 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.

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