Cluster formation in fluids with competing short-range and long-range interactions

Martin B. Sweatman, Rui Fartaria, Leo Lue

Research output: Contribution to journalArticle

40 Citations (Scopus)


We investigate the low density behaviour of fluids that interact through a short-ranged attraction together with a long-ranged repulsion (SALR potential) by developing a molecular thermodynamic model. The SALR potential is a model of effective solute interactions where the solvent degrees of freedom are integrated-out. For this system, we find that clusters form for a range of interaction parameters where attractive and repulsive interactions nearly balance, similar to micelle formation in aqueous surfactant solutions. We focus on systems for which equilibrium behaviour and liquid-like clusters (i.e., droplets) are expected, and find in addition a novel coexistence between a low density cluster phase and a high density cluster phase within a very narrow range of parameters. Moreover, a simple formula for the average cluster size is developed. Based on this formula, we propose a non-classical crystal nucleation pathway whereby macroscopic crystals are formed via crystal nucleation within microscopic precursor droplets. We also perform large-scale Monte Carlo simulations, which demonstrate that the cluster fluid phase is thermodynamically stable for this system.

Original languageEnglish
Article number124508
Number of pages16
JournalJournal of Chemical Physics
Issue number12
Publication statusPublished - 28 Mar 2014


  • short-range
  • long-range interactions
  • cluster formation
  • fluids
  • competing

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  • Research Output

    • 40 Citations
    • 1 Literature review

    The giant SALR cluster fluid: a review

    Sweatman, M. B. & Lue, L., 30 Jul 2019, In : Advanced Theory and Simulations. 2, 7, 14 p., 1900025.

    Research output: Contribution to journalLiterature review

    Open Access
  • 3 Citations (Scopus)
    5 Downloads (Pure)


    • 1 Participation in conference

    AIChE Annual Meeting 2013

    Leo Lue (Speaker)

    6 Nov 2013

    Activity: Participating in or organising an event typesParticipation in conference

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