Adhesive Shear Strength of Ice from Nanostructured Graphite Surfaces by Molecular Dynamics Simulations

TL;DR

This study uses molecular dynamics simulations to analyze how nanoscale surface textures and interfacial water depth influence ice shear strength on graphite surfaces, aiding the design of anti-icing materials.

Contribution

It provides the first theoretical insights into how surface nanotexture and interfacial water depth affect ice shear strength, informing anti-icing surface design.

Findings

Ice shear strength depends on temperature, surface lattice, and nanotexture size.

Nanoscale roughness and water interdigitation increase shear failure stress.

Deeper interlocked water layers distribute strain, enhancing shear resistance.

Abstract

The issue of ice accumulation at low-temperature circumstances causes multiple problems and serious damages in many civil infrastructures which substantially influence human daily life. However, despite the significant consideration in manufacturing anti-icing or icephobic surfaces, it is still demanding to design surfaces with well ice-repellent properties. Here in this study, we used all-atom molecular dynamics (MD) simulations to investigate ice shearing mechanism on atomistically smooth and nanotexture graphite substrates. We find that ice shearing strength strongly depends on ice temperature, the lattice structure of the surface substrate, the size of the surface nanotexture structure, and the depth of interdigitated water molecules. Our results indicate nanoscale surface roughness and depth of interdigitated water molecules tend to increase ice shear failure stress and for corrugated substrates, this is further raised with increasing the depth of interdigitated water molecules which is a result of strain being distributed well into the ice cube away from the interface. These results supply an in-depth understanding of the effect of surface nanotexture on ice shearing mechanism that provides useful information in designing anti-icing surfaces and provide for the first-time theoretical references in understanding the effect of surface nanotexture structure and depth of interlocked water on adhesive ice shear strength on nanotextured surfaces. Keywords: Ice, Graphene, Shear strength, Molecular dynamics simulation