Colloidal gels assembled via a temporary interfacial scaffold

Details Colloidal gels assembled via a temporary interfacial scaffold Colloidal gels assembled via a temporary interfacial scaffold

2009-12-07

arxiv.org/abs/0912.1307v1

Phys. Rev. Lett. 2009

Physics

Condensed Matter

Soft Condensed Matter

5 pages 4 figures

Scientific paper

The liquid-liquid phase separation of a binary solvent can be arrested by colloidal particles trapped at the interface [K. Stratford et al., Science 309, 5744 (2005)]. We show experimentally that the colloidal network so formed can remain stable after fully remixing the liquids, creating a new type of gel in which colloids in a single-phase solvent have locally planar coordination. We argue that this structure is likely maintained by primary-minimum DLVO bonding of our charged colloids, created under strong compression by capillary forces. We present simulation evidence that the combination of a short-ranged attraction with a repulsive barrier can strongly stabilize such locally planar gels.

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