Surface viscosity in simple liquids

The response of Newtonian liquids to small perturbations is usually considered to be fully described by homogeneous transport coefficients like shear and dilatational viscosity. However, the presence of strong density gradients at the liquid/vapor boundary of fluids hints at the possible existence o...

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Published in:The Journal of chemical physics 2023-03, Vol.158 (11), p.114705-114705
Main Authors: Malgaretti, Paolo, Bafile, Ubaldo, Vallauri, Renzo, Jedlovszky, Pál, Sega, Marcello
Format: Article
Language:English
Subjects:
Atmospheric chemistry
Density gradients
Liquid surfaces
Newtonian liquids
Perturbation
Transport properties
Viscosity
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description The response of Newtonian liquids to small perturbations is usually considered to be fully described by homogeneous transport coefficients like shear and dilatational viscosity. However, the presence of strong density gradients at the liquid/vapor boundary of fluids hints at the possible existence of an inhomogeneous viscosity. Here, we show that a surface viscosity emerges from the collective dynamics of interfacial layers in molecular simulations of simple liquids. We estimate the surface viscosity to be 8–16 times smaller than that of the bulk fluid at the thermodynamic point considered. This result can have important implications for reactions at liquid surfaces in atmospheric chemistry and catalysis.
doi_str_mv 10.1063/5.0141971
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source American Institute of Physics (AIP) Publications; American Institute of Physics:Jisc Collections:Transitional Journals Agreement 2021-23 (Reading list)
subjects Atmospheric chemistry
Density gradients
Liquid surfaces
Newtonian liquids
Perturbation
Transport properties
Viscosity
title Surface viscosity in simple liquids
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