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

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2008
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Crassous, Jérôme J.
Siebenbürger, Miriam
Ballauff, Matthias
Drechsler, Markus
Hajnal, David
Henrich, Oliver
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The Journal of Chemical Physics ; 128 (2008), 20. - 204902. - ISSN 0021-9606. - eISSN 1089-7690
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.
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530 Physics
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colloids,glass transition,polymers,shear flow,shear modulus
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ISO 690CRASSOUS, Jérôme J., Miriam SIEBENBÜRGER, Matthias BALLAUFF, Markus DRECHSLER, David HAJNAL, Oliver HENRICH, Matthias FUCHS, 2008. Shear stresses of colloidal dispersions at the glass transition in equilibrium and in flow. In: The Journal of Chemical Physics. 128(20), 204902. ISSN 0021-9606. eISSN 1089-7690. Available under: doi: 10.1063/1.2921801
BibTex
@article{Crassous2008-05-28Shear-914,
  year={2008},
  doi={10.1063/1.2921801},
  title={Shear stresses of colloidal dispersions at the glass transition in equilibrium and in flow},
  number={20},
  volume={128},
  issn={0021-9606},
  journal={The Journal of Chemical Physics},
  author={Crassous, Jérôme J. and Siebenbürger, Miriam and Ballauff, Matthias and Drechsler, Markus and Hajnal, David and Henrich, Oliver and Fuchs, Matthias},
  note={Article Number: 204902}
}
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