Imperial College London
Professor Andrew Parry

ProfessorAndrewParry

Faculty of Natural Sciences, Department of Mathematics

Deputy Head of Department/Professor of Statistical Physics
 
 
 
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Contact

 

+44 (0)20 7594 8537a.o.parry Website

 
 
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Location

 

6M15Huxley BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Parry:2021:10.1103/PhysRevLett.127.115703,
author = {Parry, A and Malijevsky, A},
doi = {10.1103/PhysRevLett.127.115703},
journal = {Physical Review Letters},
pages = {1--5},
title = {The edge contact angle, capillary condensation and meniscus depinning},
url = {http://dx.doi.org/10.1103/PhysRevLett.127.115703},
volume = {127},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We study the phase equilibria of a fluid confined in an open capillary slit formed when a wallof finite length H is brought a distance L away from a second macroscopic surface. This systemshows rich phase equilibria arising from the competition between two different types of capillarycondensation, corner filling and meniscus depinning transitions depending on the value of the aspectratio a = L/H. For long capillaries, with a < 2/π, the condensation is of type I involving menisciwhich are pinned at the top edges at the ends of the capillary characterized by an edge contactangle. For intermediate capillaries, with 2/π < a < 1, depending on the value of the contact anglethe condensation may be of type I or of type II, in which the menisci overspill into the reservoirand there is no pinning. For short capillaries, with a > 1, condensation is always of type II. In allregimes, capillary condensation is completely suppressed for sufficiently large contact angles. Weshow that there is an additional continuous, third-order phase transition in the condensed liquidlike phase, associated with the depinning of each meniscus as they round the upper open edges ofthe slit. Finite-size scaling predictions are developed for these transitions and phase boundarieswhich connect with the fluctuation theories of wetting and filling transitions. We test several of ourpredictions using a fully microscopic Density Functional Theory which allows us to study the twotypes of capillary condensation and its suppression at the molecular level.
AU  - Parry,A
AU  - Malijevsky,A
DO  - 10.1103/PhysRevLett.127.115703
EP  - 5
PY  - 2021///
SN  - 0031-9007
SP  - 1
TI  - The edge contact angle, capillary condensation and meniscus depinning
T2  - Physical Review Letters
UR  - http://dx.doi.org/10.1103/PhysRevLett.127.115703
UR  - https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.127.115703
UR  - http://hdl.handle.net/10044/1/91103
VL  - 127
ER  -
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