Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

History-dependent Stress Relaxation of Liquids Under High-confinement: A Molecular Dynamics Study

Version 1 : Received: 1 November 2021 / Approved: 3 November 2021 / Online: 3 November 2021 (14:56:25 CET)

How to cite: Gao, H. History-dependent Stress Relaxation of Liquids Under High-confinement: A Molecular Dynamics Study. Preprints 2021, 2021110088 (doi: 10.20944/preprints202111.0088.v1). Gao, H. History-dependent Stress Relaxation of Liquids Under High-confinement: A Molecular Dynamics Study. Preprints 2021, 2021110088 (doi: 10.20944/preprints202111.0088.v1).

Abstract

When liquids are confined into nanometer-scale slit, the induced layering-like film structure allows the liquid to sustain non-isotropic stresses and thus being load-bearing. Such anisotropic characteristics of liquid under confinement arise naturally from the liquids’ wave number dependent compressibility that does not need solidification to take place as a prerequisite. In other words, liquids under confinement can still remain fluidity with molecules being (sub-)diffusive. However, the extensively prolonged structural relaxation time can cause hysteresis of stress relaxation of confined molecules in response to the motions of confining walls and thereby yield the quasi-static stress tensor history-dependent. In this work, by means of molecule dynamics, the discrepancy of stress tensor of a highly confined key base-oil component, i.e. 1-decene trimer, is captured after its relaxation from being compressed and decompressed. The results indicate that among the effects (e.g. confinement, molecular structure, and film density) that can potentially affect confined stress tensor, the ordering status of the confined molecules plays a predominant role.

Keywords

Liquids; Confinement; Stress Relaxation; Molecular Dynamics; Hysteresis

Subject

MATERIALS SCIENCE, Surfaces, Coatings & Films

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