About

About

Radiation physics, environmental contamination, and computational science. Researcher working for the Japan Atomic Energy Agency, in Kashiwa, Japan

Spotted an error on this site?
Corrections appreciated, please email alex (at) alexmalins.com or leave a comment.

The role of quench rate in colloidal gels

Simulations of colloidal gels with clusters labelled by the Topological Cluster Classification identifier.

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 on 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 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.

C. P. Royall & A. Malins
Faraday Discussions 158, 301 (2012)

PDF: download
DOI: http://dx.doi.org/10.1039/c2fd20041d
ArXiv: http://arxiv.org/abs/1203.0664

 

Page last updated: 20th December 2014

Leave a reply

Your email address will not be published.