A phase separation in diluted Laponite suspensions: evidence of empty liquid and equilibrium gel states

Details A phase separation in diluted Laponite suspensions: evidence of empty liquid and equilibrium gel states A phase separation in diluted Laponite suspensions: evidence of empty liquid and equilibrium gel states

2010-07-13

arxiv.org/abs/1007.2111v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

The relevance of anisotropic interactions in colloidal systems has recently emerged in the context of rational design of novel soft materials. Theoretical studies have predicted the possibility of a gas-liquid phase separation confined at low densities and the formation of empty liquids and equilibrium gels in low-valence systems. Here we provide experimental evidence of this scenario in Laponite, a complex colloidal clay with discotic shape and anisotropic interactions. We also report simulations of a patchy model for Laponite platelets, able to reproduce the observed experimental phase diagram and structural properties, confirming the crucial role of the reduced valence.

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