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Issue 26, 2015

Counter-effect of Brownian and elastic forces on the liquid-to-solid transition of microgel suspensions

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Abstract

Suspensions of microgel particles undergo a transition from liquid-like to solid-like mechanics upon increase of the microgel packing fraction. We study the opposed effects of the microgel softness and size on this transition. We tune the softness of the microgels by varying their polymer crosslinking density, while we simultaneously and independently vary their size and the contribution of Brownian particle motion by investigating two sets of colloidal-scale microgels synthesized by precipitation polymerization, along with one set of granular-scale microgels prepared by droplet-templated polymerization in microfluidic devices. We find that the microgel packing fraction at which the liquid-to-solid transition occurs depends on both the size and the softness of the microgel particles: small and soft microgels undergo this transition at much larger packing fractions than stiff microgels of the same size and than larger microgels with the same softness. This work suggests a systematic strategy to quantitatively predict this transition.

Graphical abstract: Counter-effect of Brownian and elastic forces on the liquid-to-solid transition of microgel suspensions

Article information


Submitted
14 Apr 2015
Accepted
01 Jun 2015
First published
01 Jun 2015

Soft Matter, 2015,11, 5235-5245
Article type
Paper

Counter-effect of Brownian and elastic forces on the liquid-to-solid transition of microgel suspensions

F. Di Lorenzo and S. Seiffert, Soft Matter, 2015, 11, 5235 DOI: 10.1039/C5SM00881F

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