recid:326792 - Risultato della ricerca

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...

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Temperature-sensitive poly(N-Isopropyl-Acrylamide) microgel particles: A light scattering study

Reufer, Mathias ; Díaz-Leyva, Pedro ; Lynch, I. ; Scheffold, Frank

In: European Physical Journal E, 2009, vol. 28, no. 2, p. 165-171

We present a light scattering study of aqueous suspensions of microgel particles consisting of poly(N-Isopropyl-Acrylamide) cross-linked gels. The solvent quality for the particles depends on temperature and thus allows tuning of the particle size. The particle synthesis parameters are chosen such that the resulting high surface charge of the particles prevents aggregation even in the...

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