Details

Autor(en) / Beteiligte

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

Titel

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

Ist Teil von

• The Journal of chemical physics, 2008-05, Vol.128 (20), p.204902-204902

Ort / Verlag

United States

Erscheinungsjahr

2008

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.