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:2020:10.1103/PhysRevLett.124.115701,
author = {Parry, A and laska, M and Malijevsky, A},
doi = {10.1103/PhysRevLett.124.115701},
journal = {Physical Review Letters},
title = {Three-phase fluid coexistence in heterogeneous slits},
url = {http://dx.doi.org/10.1103/PhysRevLett.124.115701},
volume = {124},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We study the competition between local (bridging) and global condensation of fluid in a chemically heterogeneous capillary slit made from two parallel adjacent walls each patterned with a single stripe. Using a mesoscopic modified Kelvin equation, which determines the shape of the menisci pinned at the stripe edges in the bridge phase, we determine the conditions under which the local bridging transition precedes capillary condensation as the pressure (or chemical potential) is increased. Provided the contact angle of the stripe is less than that of the outer wall we show that triple points, where evaporated, locally condensed, and globally condensed states all coexist are possible depending on the value of the aspect ratio a=L/H, where H  is the stripe width and L the wall separation. In particular, for a capillary made from completely dry walls patterned with completely wet stripes the condition for the triple point occurs when the aspect ratio takes its maximum possible value 8 /π. These predictions are tested using a fully microscopic classical density functional theory and shown to be remarkably accurate even for molecularly narrow slits. The qualitative differences with local and global condensation in heterogeneous cylindrical pores are also highlighted.
AU  - Parry,A
AU  - laska,M
AU  - Malijevsky,A
DO  - 10.1103/PhysRevLett.124.115701
PY  - 2020///
SN  - 0031-9007
TI  - Three-phase fluid coexistence in heterogeneous slits
T2  - Physical Review Letters
UR  - http://dx.doi.org/10.1103/PhysRevLett.124.115701
UR  - http://hdl.handle.net/10044/1/78591
VL  - 124
ER  -
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