title: A numerical study of one-patch colloidal particles: from square-well to Janus.
abstract: 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.
authors: Dipartimento di Fisica and CNR-ISC, Università di Roma La Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy. francesco.sciortino@uniroma1.it
authors: Francesco
authors: F
authors: Sciortino
authors: Achille
authors: A
authors: Giacometti
authors: Giorgio
authors: G
authors: Pastore