Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 12, Issue 38, Pages 11869-11877Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp00504e
Keywords
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Funding
- NoE SoftComp [NMP3-CT-2004-502235]
- PRIN-COFIN [2007B57EAB]
- [ERC-226207-PATCHYCOL-LOIDS]
- [ITN-234810-COMPLOIDS]
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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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