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Molecular simulation of thin liquid films : thermal fluctuations and instability
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Zhang, Yixin, Sprittles, James E. and Lockerby, Duncan A. (2019) Molecular simulation of thin liquid films : thermal fluctuations and instability. Physical Review E, 100 . 023108. doi:10.1103/PhysRevE.100.023108 ISSN 1539-3755.
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Official URL: http://dx.doi.org/10.1103/PhysRevE.100.023108
Abstract
The instability of a thin liquid film on a solid surface is studied both by molecular dynamics simulations (MD) and a stochastic thin-film equation (STF), which models thermal fluctuations with white noise. A linear stability analysis of the STF allows us to derive a power spectrum for the surface fluctuations, which is quantitatively validated against the spectrum observed in MD. Thermal fluctuations are shown to be critical to the dynamics of nanoscale films. Compared to the classical instability mechanism, which is driven by disjoining pressure, fluctuations (a) can massively amplify the instability, (b) cause the fluctuation wavelength that is dominant to evolve in time (a single fastest-growing mode does not exist), and (c) decrease the critical wavelength so that classically stable films can be ruptured.
Item Type: | Journal Article | |||||||||||||||
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Subjects: | Q Science > QC Physics Q Science > QP Physiology T Technology > TA Engineering (General). Civil engineering (General) |
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Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Liquid films, Thin films , Thin films -- Thermal properties , Molecular dynamics | |||||||||||||||
Journal or Publication Title: | Physical Review E | |||||||||||||||
Publisher: | American Physical Society | |||||||||||||||
ISSN: | 1539-3755 | |||||||||||||||
Official Date: | 16 August 2019 | |||||||||||||||
Dates: |
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Volume: | 100 | |||||||||||||||
Article Number: | 023108 | |||||||||||||||
DOI: | 10.1103/PhysRevE.100.023108 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||
Copyright Holders: | © 2019 American Physical Society | |||||||||||||||
Date of first compliant deposit: | 18 June 2019 | |||||||||||||||
Date of first compliant Open Access: | 25 June 2019 | |||||||||||||||
RIOXX Funder/Project Grant: |
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