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Volume 158, 2012

The role of quench rate in colloidal gels

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Abstract

Interactions between colloidal particles have hitherto usually been fixed by the suspension composition. Recent experimental developments now enable the control of interactions in situ. Here we use Brownian dynamics simulations to investigate the effect of controlling interactions upon gelation, by “quenching” the system from an equilibrium fluid to a gel. We find that, contrary to the normal case of an instantaneous quench, where the local structure of the gel is highly disordered, controlled quenching results in a gel with a much higher degree of local order. Under sufficiently slow quenching, local crystallisation is found, which is strongly enhanced when a monodisperse system is used. The higher the degree of local order, the smaller the mean squared displacement, indicating an enhancement of gel stability.

Article information


Submitted
01 Mar 2012
Accepted
04 May 2012
First published
04 May 2012

Faraday Discuss., 2012,158, 301-311
Article type
Paper

The role of quench rate in colloidal gels

C. P. Royall and A. Malins, Faraday Discuss., 2012, 158, 301 DOI: 10.1039/C2FD20041D

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