Origin and Detection of Microstructural Clustering in Fluids with Spatial-Range Competitive Interactions

Abstract

Fluids with competing short-range attractions and long-range repulsions mimic dispersions of charge-stabilized colloids that can display equilibrium structures with intermediate range order (IRO), including particle clusters. Using simulations and analytical theory, we demonstrate how to detect cluster formation in such systems from the static structure factor and elucidate links to macrophase separation in purely attractive reference fluids. We find that clusters emerge when the thermal correlation length encoded in the IRO peak of the structure factor exceeds the characteristic lengthscale of interparticle repulsions. We also identify qualitative differences between the dynamics of systems that form amorphous versus micro-crystalline clusters.

6 pages, 5 figures

References in corpus (3)

• Equilibrium cluster phases and low-density arrested disordered states: The role of short-range attraction and long-range repulsion
• Observation of empty liquids and equilibrium gels in a colloidal clay
• Colloidal systems with competing interactions: from an arrested repulsive cluster phase to a gel

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