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Phys Chem Chem Phys. 2010 Oct 14;12(38):11869-77. doi: 10.1039/c0cp00504e. Epub 2010 Aug 11.

A numerical study of one-patch colloidal particles: from square-well to Janus.

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  • 1Dipartimento di Fisica and CNR-ISC, Universit√† di Roma La Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy. francesco.sciortino@uniroma1.it


We perform numerical simulations of a simple model of one-patch colloidal particles to investigate: (i) the behavior of the gas-liquid phase diagram on moving from a spherical attractive potential to a Janus potential and (ii) the collective structure of a system of Janus particles. We show that, for the case where one of the two hemispheres is attractive and one is repulsive, the system organizes into a dispersion of orientationally ordered micelles and vesicles and, at low temperature (T), the system can be approximated as a fluid of such clusters, interacting essentially via excluded volume. The stability of this cluster phase generates a very peculiar shape of the gas and liquid coexisting densities, with a gas coexistence density that increases on cooling, approaching the liquid coexistence density at very low T.

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