Glasslike Arrest in Spinodal Decomposition as a Route to Colloidal Gelation

Details Glasslike Arrest in Spinodal Decomposition as a Route to Colloidal Gelation Glasslike Arrest in Spinodal Decomposition as a Route to Colloidal Gelation

2004-12-27

arxiv.org/abs/cond-mat/0412716v2

Phys. Rev. Lett. 95, 238302 (2005)

Physics

Condensed Matter

Soft Condensed Matter

14 pages, 4 figures; replaced with published version

Scientific paper

10.1103/PhysRevLett.95.238302

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.

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