Friction and slip at solid/liquid interface in vibrational systems

TL;DR

This study uses molecular dynamics simulations to explore how slip at solid/liquid interfaces affects energy dissipation in vibrating systems, revealing phenomena at high frequencies and proposing a new analytical model for MEMS applications.

Contribution

It introduces a new analytical model linking slip length to damping and frequency shifts, enhancing understanding of high-frequency vibrational systems at solid/liquid interfaces.

Findings

Physical phenomena emerge at high frequencies affecting energy dissipation.

A linear relationship between slip length and damping/frequency shift ratio.

The model enables experimental estimation of slip length from vibrational data.

Abstract

Molecular dynamics simulations have been performed to study frictional slip and its influence on energy dissipation and momentum transfer at atomically smooth solid/water interfaces. By modifying surface chemistry, we investigate the relationship between slip and the mechanical response of a vibrating solid for both hydrophilic and hydrophobic surfaces. We discover physical phenomena that emerge at high frequencies and that have significant contributions to energy dissipation. A new analytical model is developed to describe mechanical response of the resonators in this high frequency regime, which is relevant in such applications as MEMS-based biosensors. We find a linear relationship between the slip length and the ratio of the damping rate shift to resonant frequency shift, which provides a new way to obtain information about slip length from experiments.