Viscosity anomaly in core-softened liquids

TL;DR

This study investigates the viscosity behavior of core-softened liquids through molecular dynamics simulations, focusing on potential anomalies and the breakdown of classical relations at low temperatures.

Contribution

It provides the first detailed analysis of viscosity anomalies in core-softened systems, extending understanding beyond diffusion properties.

Findings

Viscosity exhibits anomalous behavior in core-softened liquids.

The Stokes-Einstein relation breaks down at low temperatures.

Viscosity anomalies correlate with diffusion anomalies.

Abstract

The present article presents a molecular dynamics study of several anomalies of core-softened systems. It is well known that many core-softened liquids demonstrate diffusion anomaly. Usual intuition relates the diffusion coefficient to shear viscosity via Stockes-Einstein relation. However, it can break down at low temperature. In this respect it is important to see if viscosity also demonstrates anomalous behavior.