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Université de Fribourg

Multiple dynamic regimes in concentrated microgel systems

Sessoms, David A. ; Bischofberger, Irmgard ; Cipelletti, Luca ; Trappe, Véronique

In: Philosophical Transactions of the Royal Society A, 2009, vol. 367, no. 1909, p. 5013-5032

We investigate dynamical heterogeneities in the collective relaxation of a concentrated microgel system, for which the packing fraction can be conveniently varied by changing the temperature. The packing fraction-dependent mechanical properties are characterized by a fluid–solid transition, where the system properties switch from a viscous to an elastic low-frequency behaviour. Approaching this...