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Theory for the phase behaviour of a colloidal fluid with competing interactions

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posted on 07.10.2014, 14:18 authored by Andrew ArcherAndrew Archer, C. Ionescu, D. Pini, L. Reatto
We study the phase behaviour of a fluid composed of particles which interact via a pair potential that is repulsive for large inter-particle distances, is attractive at intermediate distances and is strongly repulsive at short distances (the particles have a hard core). As well as exhibiting gas–liquid phase separation, this system also exhibits phase transitions from the uniform fluid phases to modulated inhomogeneous fluid phases. Starting from a microscopic density functional theory, we develop an order parameter theory for the phase transition in order to examine in detail the phase behaviour. The amplitude of the density modulations is the order parameter in our theory. The theory predicts that the phase transition from the uniform to the modulated fluid phase can be either first order or second order (continuous). The phase diagram exhibits two tricritical points, joined to each other by the line of second order transitions.

Funding

A.J.A. is grateful for the support of RCUK and C. I., D. P., and L. R. acknowledge support from the European Union, Contract No. MRTN-CT2003-504712.

History

School

  • Science

Department

  • Mathematical Sciences

Published in

JOURNAL OF PHYSICS-CONDENSED MATTER

Volume

20

Issue

41

Pages

? - ? (11)

Citation

ARCHER, A.J. ... et al, 2008. Theory for the phase behaviour of a colloidal fluid with competing interactions. Journal of Physics: Condensed Matter, 20 (41), 415106.

Publisher

© IOP Publishing Ltd

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2008

Notes

This article was published in the serial, Journal of Physics: Condensed Matter [© IOP Press]. The definitive version is available at: http://dx.doi.org/10.1088/0953-8984/20/41/415106

ISSN

0953-8984

Language

en

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