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Gas-liquid phase separation in oppositely charged colloids: stability and interfacial tension.

Fortini, A, Hynninen, AP and Dijkstra, M (2006) Gas-liquid phase separation in oppositely charged colloids: stability and interfacial tension. J Chem Phys, 125 (9).

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Abstract

We study the phase behavior and the interfacial tension of the screened Coulomb (Yukawa) restricted primitive model (YRPM) of oppositely charged hard spheres with diameter sigma using Monte Carlo simulations. We determine the gas-liquid and gas-solid phase transitions using free energy calculations and grand-canonical Monte Carlo simulations for varying inverse Debye screening length kappa. We find that the gas-liquid phase separation is stable for kappasigma<or=4, and that the critical temperature decreases upon increasing the screening of the interaction (decreasing the range of the interaction). In addition, we determine the gas-liquid interfacial tension using grand-canonical Monte Carlo simulations. The interfacial tension decreases upon increasing the range of the interaction. In particular, we find that simple scaling can be used to relate the interfacial tension of the YRPM to that of the restricted primitive model, where particles interact with bare Coulomb interactions.

Item Type: Article
Authors :
NameEmailORCID
Fortini, Aa.fortini@surrey.ac.ukUNSPECIFIED
Hynninen, APUNSPECIFIEDUNSPECIFIED
Dijkstra, MUNSPECIFIEDUNSPECIFIED
Date : 7 September 2006
Identification Number : 10.1063/1.2335453
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:16
Last Modified : 17 May 2017 15:10
URI: http://epubs.surrey.ac.uk/id/eprint/838593

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