The giant SALR cluster fluid: a review

Martin B. Sweatman, Leo Lue

Research output: Contribution to journalLiterature review

Abstract

We review recent developments in understanding the behaviour of equilibrium fluids with competing short-range attractions and long-range repulsions at low concentration. Typically, this SALR model system is used to represent solutions where at least one of the solute species interacts via a screened-coulomb potential, which includes many colloidal, nanoparticle and polyelectrolyte solutions among others. Provided neither the short-range or long-range interactions are too strong, and the concentration remains sufficiently low, then discrete spherical clusters of solute are expected, here called “Giant SALR clusters”. Because these clusters can themselves be disordered, as though fluid particles with a renormalised interaction, such cluster fluids cannot be treated using standard mean field methods. Our review therefore focuses on theoretical routes that aim to overcome this difficulty. We highlight the main outcomes of these theories and discuss how they relate to soft matter and especially biology, including complex coacervates, membraneless organelles and the origin of life.
LanguageEnglish
Article number1900025
Number of pages14
JournalAdvanced Theory and Simulations
Volume2
Issue number7
Early online date25 Apr 2019
DOIs
Publication statusPublished - 30 Jul 2019

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Fluids
Polyelectrolytes
Nanoparticles

Keywords

  • equilibrium fluids
  • nanoparticles
  • mobile particles

Cite this

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The giant SALR cluster fluid : a review. / Sweatman, Martin B.; Lue, Leo.

In: Advanced Theory and Simulations, Vol. 2, No. 7, 1900025, 30.07.2019.

Research output: Contribution to journalLiterature review

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N2 - We review recent developments in understanding the behaviour of equilibrium fluids with competing short-range attractions and long-range repulsions at low concentration. Typically, this SALR model system is used to represent solutions where at least one of the solute species interacts via a screened-coulomb potential, which includes many colloidal, nanoparticle and polyelectrolyte solutions among others. Provided neither the short-range or long-range interactions are too strong, and the concentration remains sufficiently low, then discrete spherical clusters of solute are expected, here called “Giant SALR clusters”. Because these clusters can themselves be disordered, as though fluid particles with a renormalised interaction, such cluster fluids cannot be treated using standard mean field methods. Our review therefore focuses on theoretical routes that aim to overcome this difficulty. We highlight the main outcomes of these theories and discuss how they relate to soft matter and especially biology, including complex coacervates, membraneless organelles and the origin of life.

AB - We review recent developments in understanding the behaviour of equilibrium fluids with competing short-range attractions and long-range repulsions at low concentration. Typically, this SALR model system is used to represent solutions where at least one of the solute species interacts via a screened-coulomb potential, which includes many colloidal, nanoparticle and polyelectrolyte solutions among others. Provided neither the short-range or long-range interactions are too strong, and the concentration remains sufficiently low, then discrete spherical clusters of solute are expected, here called “Giant SALR clusters”. Because these clusters can themselves be disordered, as though fluid particles with a renormalised interaction, such cluster fluids cannot be treated using standard mean field methods. Our review therefore focuses on theoretical routes that aim to overcome this difficulty. We highlight the main outcomes of these theories and discuss how they relate to soft matter and especially biology, including complex coacervates, membraneless organelles and the origin of life.

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