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

J. J. Crassous, Miriam Siebenbürger, M. Ballauff, M. Drechsler, D. Hajnal, O. Henrich, M. Fuchs

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Abstract

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 cross-linked poly(N -isopropylacrylamide) 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 nonlinear rheology and glass transition is clarified. While the theoretical models semiquantitatively fit the data taken in fluid states and the predominant elastic response of glass, a yet unaccounted dissipative mechanism is identified in glassy states.

Original languageEnglish
Article number204902
Number of pages17
JournalJournal of Chemical Physics
Volume128
Issue number20
DOIs
Publication statusPublished - 28 May 2008

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Keywords

  • glass transition
  • shear stress
  • flow curves
  • shear rates

Cite this

Crassous, J. J., Siebenbürger, M., Ballauff, M., Drechsler, M., Hajnal, D., Henrich, O., & Fuchs, M. (2008). Shear stresses of colloidal dispersions at the glass transition in equilibrium and in flow. Journal of Chemical Physics , 128(20), [204902]. https://doi.org/10.1063/1.2921801