Shear stresses of colloidal dispersions at the glass transition in equilibrium and in flow

Details Shear stresses of colloidal dispersions at the glass transition in equilibrium and in flow Shear stresses of colloidal dispersions at the glass transition in equilibrium and in flow

2008-04-17

arxiv.org/abs/0804.2737v1

Physics

Condensed Matter

Soft Condensed Matter

17 pages, 11 figures; J. Chem. Phys. in print (2008)

Scientific paper

10.1063/1.2921801

We consider a model dense colloidal dispersion at the glass transition, and investigate the connection between equilibrium stress fluctuations, seen in linear shear moduli, and the shear stresses under strong flow conditions far from equilibrium, viz. flow curves for finite shear rates. To this purpose thermosensitive core-shell particles consisting of a polystyrene core and a crosslinked poly(N-isopropylacrylamide)(PNIPAM) shell were synthesized. Data over an extended range in shear rates and frequencies are compared to theoretical results from integrations through transients and mode coupling approaches. The connection between non-linear rheology and glass transition is clarified. While the theoretical models semi-quantitatively fit the data taken in fluid states and the predominant elastic response of glass, a yet unaccounted dissipative mechanism is identified in glassy states.

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