Multiple dynamic regimes in concentrated microgel systems

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
David A SessomsVéronique Trappe

Abstract

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 transition from below, we find that the range xi of spatial correlations in the dynamics increases. Beyond this transition, xi reaches a maximum, extending over the entire observable system size of approximately 5 mm. Increasing the packing fraction even further leads to a second transition, which is characterized by the development of large zones of lower and higher dynamical activity that are well separated from each other; the range of correlation decreases at this point. This striking non-monotonic dependence of xi on volume fraction is reminiscent of the behaviour recently observed at the jamming/rigidity transition in granular systems. We identify this second transition as the transition to 'squeezed' states, where the constituents of the system start to exert direct contact forces on each other, such that the dynamics becomes incr...Continue Reading

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Citations

Mar 13, 2014·The Journal of Chemical Physics·Priti S MohantyPeter Schurtenberger
Apr 6, 2013·The Journal of Chemical Physics·Atsushi IkedaGiulio Biroli
Dec 6, 2011·Annual Review of Physical Chemistry·L Andrew Lyon, Alberto Fernandez-Nieves
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