Glasslike arrest in spinodal decomposition as a route to colloidal gelation

Colloid-polymer mixtures can undergo spinodal decomposition into colloid-rich and colloid-poor regions. Gelation results when interconnected colloid-rich regions solidify. We show that this occurs when these regions undergo a glass transition, leading to dynamic arrest of the spinodal decomposition. The characteristic length scale of the gel decreases with increasing quench depth, and the nonergodicity parameter exhibits a pronounced dependence on scattering vector. Mode coupling theory gives a good description of the dynamics, provided we use the full static structure as input. © 2005 The American Physical Society.


Published in:
Physical Review Letters, 95, 23, 238302
Year:
2005
ISSN:
0031-9007
Laboratories:




 Record created 2012-11-26, last modified 2018-05-17

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