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Colloidal Gels Assembled via a Temporary Interfacial Scaffold

2009; American Physical Society; Volume: 103; Issue: 25 Linguagem: Inglês

10.1103/physrevlett.103.255502

1092-0145

Eduardo Sanz, K. A. White, Paul S. Clegg, M. E. Cates,

Micro and Nano Robotics

The liquid-liquid phase separation of a binary solvent can be arrested by colloidal particles trapped at the interface [K. Stratford, Science 309, 2198 (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 Derjaguin-Landau-Verweg-Overbeek 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.