Volume 93, Number 2, March 2011
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||02 February 2011|
Phase diagram of the penetrable-square-well model
National Institute for Theoretical Physics (NITheP) and Institute of Theoretical Physics Stellenbosch 7600, South Africa
2 E. Hála Laboratory of Thermodynamics, Institute of Chemical Process Fundamentals of the ASCR and Department of Physical Chemistry, Institute of Chemical Technology - Prague, 166 28 Praha 6, Czech Republic, EU
3 Departamento de Física, Universidad de Extremadura - E-06071 Badajoz, Spain, EU
4 Dipartimento di Scienze Molecolari e Nanosistemi, Università Ca' Foscari Venezia - S. Marta DD2137, I-30123 Venezia, Italy, EU
Accepted: 3 January 2011
We study a system formed by soft colloidal spheres attracting each other via a square-well potential, using extensive Monte Carlo simulations of various nature. The softness is implemented through a reduction of the infinite part of the repulsive potential to a finite one. For sufficiently low values of the penetrability parameter we find the system to be Ruelle stable with square-well–like behavior. For high values of the penetrability the system is thermodynamically unstable and collapses into an isolated blob formed by a few clusters each containing many overlapping particles. For intermediate values of the penetrability the system has a rich phase diagram with a partial lack of thermodynamic consistency.
PACS: 64.60.De – Statistical mechanics of model systems (Ising model, Potts model, field-theory models, Monte Carlo techniques, etc.) / 64.60.Ej – Studies/theory of phase transitions of specific substances / 64.70.D- – Solid-liquid transitions
© EPLA, 2011
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