Physics

Rapid onset of molecular friction in liquids bridging between the atomistic and hydrodynamic pictures

A. V. Straube, B. G. Kowalik, et al.

This groundbreaking research by Arthur V. Straube, Bartosz G. Kowalik, Roland R. Netz, and Felix Höfling delves into the atomistic origins of friction in liquids. By examining water, a Lennard-Jones fluid, and a supercooled mixture, the study uncovers the sudden onset of friction and its implications for understanding the mechanical properties of soft materials.

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Abstract

This paper investigates the onset of friction in liquids from an atomistic perspective using high-precision simulations of three liquids: water, a Lennard-Jones fluid, and a supercooled binary mixture. The study reveals that friction emerges abruptly at a characteristic frequency, beyond which the liquid behaves like an elastic solid. The Generalized Stokes-Einstein Relation is tested and found to be valid for water and a supercooled liquid but not for a Newtonian fluid. The findings provide insights into vitrification mechanisms and the mechanical properties of soft materials.

Publisher

Communications Physics

Published On

Jul 10, 2020

Authors

Arthur V. Straube, Bartosz G. Kowalik, Roland R. Netz, Felix Höfling

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