Unexpected Large Impact of Small Charges on Surface Frictions with Similar Wetting Properties

Overview

Journal Commun Chem

Publisher Springer Nature

Specialty Chemistry

Date 2023 Jan 27

PMID 36703380

Authors

Chunlei Wang

Haijun Yang

Xian Wang

Chonghai Qi

Mengyang Qu

Nan Sheng

Rongzheng Wan

Yusong Tu

Guosheng Shi

Affiliations

Soon will be listed here.

Abstract

Generally, the interface friction on solid surfaces is regarded as consistent with wetting behaviors, characterized by the contact angles. Here using molecular dynamics simulations, we find that even a small charge difference (≤0.36 e) causes a change in the friction coefficient of over an order of magnitude on two-dimensional material and lipid surfaces, despite similar contact angles. This large difference is confirmed by experimentally measuring interfacial friction of graphite and MoS contacting on water, using atomic force microscopy. The large variation in the friction coefficient is attributed to the different fluctuations of localized potential energy under inhomogeneous charge distribution. Our results help to understand the dynamics of two-dimensional materials and biomolecules, generally formed by atoms with small charge, including nanomaterials, such as nitrogen-doped graphene, hydrogen-terminated graphene, or MoS, and molecular transport through cell membranes.

Citing Articles

Surface Potential Driven Water Harvesting from Fog.

Ura D, Knapczyk-Korczak J, Szewczyk P, Sroczyk E, Busolo T, Marzec M ACS Nano. 2021; 15(5):8848-8859.

PMID: 33900735 PMC: 8158858. DOI: 10.1021/acsnano.1c01437.

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