Dynamic equivalence between atomic and colloidal liquids

Abstract

We show that the kinetic-theoretical self-diffusion coefficient of an atomic fluid plays the same role as the short-time self-diffusion coefficient D_S in a colloidal liquid, in the sense that the dynamic properties of the former, at times much longer than the mean free time, and properly scaled with D_S, will indistinguishable from those of a colloidal liquid with the same interaction potential. One important consequence of such dynamic equivalence is that the ratio D_L/ D_S of the long-time to the short-time self-diffusion coefficients must then be the same for both, an atomic and a colloidal system characterized by the same inter-particle interactions. This naturally extends to atomic fluids a well-known dynamic criterion for freezing of colloidal liquids[Phys. Rev. Lett. 70, 1557 (1993)]. We corroborate these predictions by comparing molecular and Brownian dynamics simulations on (soft- and hard-sphere) model systems, representative of what we may refer to as the "hard-sphere" dynamic universality class.

References in corpus (4)

• Crystallization of hard-sphere glasses
• Simplified Self-Consistent Theory of Colloid Dynamics
• Equilibration of Concentrated Hard Sphere Fluids
• Density-Temperature-Softness Scaling of the Dynamics of Glass-forming Soft-sphere Liquids

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• Cage Size and Jump Precursors in Glass-Forming Liquids: Experiment and Simulations
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• NVU perspective on simple liquids' quasiuniversality
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• Density scaling and quasiuniversality of flow-event statistics for athermal plastic flows
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• Temperature dependence of the transition packing fraction of thermal jamming in a harmonic soft sphere system
• Stirring supercooled colloidal liquids at the particle scale