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Surface nanodrops and nanobubbles: a classical density functional theory study

Published online by Cambridge University Press:  03 March 2021

Peter Yatsyshin Open the ORCID record for Peter Yatsyshin [Opens in a new window]  and
Serafim Kalliadasis Open the ORCID record for Serafim Kalliadasis [Opens in a new window]
Peter Yatsyshin*
Affiliation:
Department of Chemical Engineering, Imperial College London, LondonSW7 2AZ, UK
Serafim Kalliadasis
Affiliation:
Department of Chemical Engineering, Imperial College London, LondonSW7 2AZ, UK
*
Email address for correspondence: [email protected]
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Abstract

We present a fully microscopic study of the interfacial thermodynamics of nanodrops and nanobubbles, adsorbed on flat substrates with first-order wetting. We show that both nanodrops and nanobubbles are thermodynamically accessible in regions, demarcated by the spinodals of planar wetting films, with nanobubbles occupying a relatively bigger portion of the phase space. While nanodrops can be described as near-spherical caps of Laplace radius, the radius of nanobubbles is very different from the Laplace value. Additionally, nanobubbles are accompanied by a thin gas film adsorbed on the substrate. By computing the interface binding potential, we relate the sphericity of nanodrops to the thin–thick liquid film coexistence (prewetting transition), whereas nanobubble shapes are determined only by the decay of the fluid–substrate forces.

JFM classification

Mathematical Foundations: General fluid mechanics Micro-/Nano-fluid dynamics: Non-continuum effects
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 913 , 25 April 2021 , A45
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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Footnotes

†

Present address: The Alan Turing Institute, 2QR, 96 Euston Road, London NW1 2DB, UK.

References

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