Dynamic equivalence between atomic and colloidal liquids

The authors show that the kinetic-theoretical self-diffusion coefficient of an atomic fluid plays the same role as the short-time self-diffusion coefficient D sub( 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 prop...

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Bibliographic Details
Published in:Europhysics letters 2012-08, Vol.99 (4), p.1-1
Main Authors: Lopez-Flores, Leticia, Mendoza-Mendez, Patricia, Sanchez-Diaz, Luis E, Yeomans-Reyna, Laura L, Vizcarra-Rendon, Alejandro, Perez-Angel, Gabriel, Chavez-Paez, Martin, Medina-Noyola, Magdaleno
Format: Article
Language:English
Subjects:
Coefficients
Colloids
Computational fluid dynamics
Dynamical systems
Dynamics
Fluid flow
Fluids
Liquids
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Summary:The authors show that the kinetic-theoretical self-diffusion coefficient of an atomic fluid plays the same role as the short-time self-diffusion coefficient D sub( 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 sub( S), will be indistinguishable from those of a colloidal liquid with the same interaction potential. One important consequence of such dynamic equivalence is that the ratio D sub(L)/D sub( 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. The authors corroborate these predictions by comparing molecular and Brownian dynamics simulations on the hard-sphere system and on other soft-sphere model systems, representative of the hard-sphere dynamic universality class.
ISSN:0295-5075
1286-4854