Wetting of a plane with a narrow solvophobic stripe

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Title: Wetting of a plane with a narrow solvophobic stripe
Authors: Yatsyshin, P
Parry, AO
Rascon, C
Kalliadasis, S
Item Type: Journal Article
Abstract: We present a numerical study of a simple density functional theory model of fluid adsorption occurring on a planar wall decorated with a narrow deep stripe of a weaker adsorbing (relatively solvophobic) material, where wall-fluid and fluid-fluid intermolecular forces are considered to be dispersive. Both the stripe and outer substrate exhibit first-order wetting transitions with the wetting temperature of the stripe lying above that of the outer material. This geometry leads to a rich phase diagram due to the interplay between the pre-wetting transition of the outer substrate and an unbending transition corresponding to the local evaporation of liquid near the stripe. Depending on the width of the stripe the line of unbending transitions merges with the pre-wetting line inducing a two-dimensional wetting transition occurring across the substrate. In turn, this leads to the continuous pre- drying of the thick pre-wetting film as the pre-wetting line is approached from above. Interestingly we find that the merging of the unbending and pre-wetting lines occurs even for the widest stripes considered. This contrasts markedly with the scenario where the outer material has the higher wetting temperature, for which the merging of the unbending and pre-wetting lines only occurs for very narrow stripes.
Issue Date: 1-Jun-2018
Date of Acceptance: 23-Apr-2018
URI: http://hdl.handle.net/10044/1/59267
DOI: https://dx.doi.org/10.1080/00268976.2018.1473648
ISSN: 0026-8976
Publisher: Taylor & Francis
Start Page: 1990
End Page: 1997
Journal / Book Title: Molecular Physics
Volume: 116
Copyright Statement: © 2018 Informa UK Limited, trading as Taylor & Francis Group. This is an Accepted Manuscript of an article published by Taylor & Francis in Molecular Physics on 01 June 2018, available online: https://www.tandfonline.com/doi/full/10.1080/00268976.2018.1473648
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Commission of the European Communities
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (E
Funder's Grant Number: EP/L020564/1
247031
EP/L027186/1
EP/R511547/1
Keywords: Science & Technology
Physical Sciences
Chemistry, Physical
Physics, Atomic, Molecular & Chemical
Chemistry
Physics
Wetting
classical density functional theory
DENSITY-FUNCTIONAL THEORY
CAPILLARY CONDENSATION
FILMS
TRANSITION
FLUIDS
ADSORPTION
SURFACE
WEDGE
MODEL
INTERFACE
0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
0306 Physical Chemistry (incl. Structural)
0307 Theoretical and Computational Chemistry
Chemical Physics
Publication Status: Published
Online Publication Date: 2018-06-01
Appears in Collections:Faculty of Engineering
Mathematics
Chemical Engineering
Applied Mathematics and Mathematical Physics
Faculty of Natural Sciences



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