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Squeeze-out of branched alkanes on graphite.

作者信息

Gosvami N N, Sinha S K, O'Shea S J

机构信息

Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore 117576.

出版信息

Phys Rev Lett. 2008 Feb 22;100(7):076101. doi: 10.1103/PhysRevLett.100.076101. Epub 2008 Feb 20.

DOI:10.1103/PhysRevLett.100.076101
PMID:18352571
Abstract

We study squalane and heptamethylnonane (HMN) confined between a conducting atomic force microscope tip and a graphite surface. Solvation layering occurs for both liquids but marked differences in the squeeze out mechanics are observed for ordered or disordered monolayers. The squalane monolayer at 25 degrees C is an ordered solid, as verified by direct imaging, and the squeeze out can be modeled using elastic continuum mechanics. HMN is in a disordered state at 25 degrees C and cannot be modeled as a single elastic asperity even in solid-solid contact because HMN liquid is trapped in the contact zone.

摘要

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