We study a binary non-additive hard-sphere mixture with square well interactions only between dissimilar particles. An appropriate choice of the inter-particle potential parameters favors the formation of equilibrium structures with tetrahedral ordering (Zaccarelli et al 2007 J. Chem. Phys. 127 174501). By performing extensive event-driven molecular dynamics simulations, we monitor the dynamics of the system, locating the iso-diffusivity lines in the phase diagram, and discuss their location with respect to the gas-liquid phase separation. We observe the formation of an ideal gel which continuously crosses towards an attractive glass upon increasing the density. Moreover, we evaluate the statistical properties of the potential energy landscape for this model. We find that the configurational entropy, for densities within the optimal network-forming region, is finite even in the ground state and obeys a logarithmic dependence on the energy.

A spherical model with directional interactions: II. Dynamics and landscape properties / Christian, Mayer; Sciortino, Francesco; Tartaglia, Piero; Zaccarelli, Emanuela. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 22:10(2010), pp. 104110-104110-10. ((Intervento presentato al convegno Workshop on New Trends in Simulating Colloids and Self-Assembling Systems tenutosi a Lausanne, SWITZERLAND nel OCT 06-09, 2008 [10.1088/0953-8984/22/10/104110].

A spherical model with directional interactions: II. Dynamics and landscape properties

SCIORTINO, Francesco;TARTAGLIA, Piero;ZACCARELLI, EMANUELA
2010

Abstract

We study a binary non-additive hard-sphere mixture with square well interactions only between dissimilar particles. An appropriate choice of the inter-particle potential parameters favors the formation of equilibrium structures with tetrahedral ordering (Zaccarelli et al 2007 J. Chem. Phys. 127 174501). By performing extensive event-driven molecular dynamics simulations, we monitor the dynamics of the system, locating the iso-diffusivity lines in the phase diagram, and discuss their location with respect to the gas-liquid phase separation. We observe the formation of an ideal gel which continuously crosses towards an attractive glass upon increasing the density. Moreover, we evaluate the statistical properties of the potential energy landscape for this model. We find that the configurational entropy, for densities within the optimal network-forming region, is finite even in the ground state and obeys a logarithmic dependence on the energy.
01 Pubblicazione su rivista::01a Articolo in rivista
A spherical model with directional interactions: II. Dynamics and landscape properties / Christian, Mayer; Sciortino, Francesco; Tartaglia, Piero; Zaccarelli, Emanuela. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 22:10(2010), pp. 104110-104110-10. ((Intervento presentato al convegno Workshop on New Trends in Simulating Colloids and Self-Assembling Systems tenutosi a Lausanne, SWITZERLAND nel OCT 06-09, 2008 [10.1088/0953-8984/22/10/104110].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/227470
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