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:2017:10.1103/PhysRevE.96.032801,
author = {Parry, AO and malijevsky, A and Pospisil, M},
doi = {10.1103/PhysRevE.96.032801},
journal = {Physical Review E},
title = {Scaling behavior of thin films on chemically heterogeneous walls},
url = {http://dx.doi.org/10.1103/PhysRevE.96.032801},
volume = {96},
year = {2017}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We study the adsorption of a fluid in the grand canonical ensemble occurring at a planar heterogeneous wall which is decorated with a chemical stripe of width L. We suppose that the material of the stripe strongly preferentially adsorbs the liquid in contrast to the outer material which is only partially wet. This competition leads to the nucleation of a droplet of liquid on the stripe, the height hmand shape of which (at bulk two-phase coexistence) has been predicted previously using mesoscopic interfacial Hamiltonian theory. We test these predictions using a microscopic Fundamental Measure Density Functional Theory which incorporates short-ranged fluid-fluid and fully long-ranged wall-fluid interactions. Our model functional accurately describes packing effects not captured by the interfacial Hamiltonian but still we show that there is excellent agreement with the predictions hm≈L1/2 and for the scaled circular shape of the drop even for L as small as 50 molecular diameters. For smaller stripes the droplet height is considerably lower than that predicted by the mesoscopic interfacial theory. Phase transitions for droplet configurations occurring on substrates with multiple stripes are also discussed.
AU  - Parry,AO
AU  - malijevsky,A
AU  - Pospisil,M
DO  - 10.1103/PhysRevE.96.032801
PY  - 2017///
SN  - 1539-3755
TI  - Scaling behavior of thin films on chemically heterogeneous walls
T2  - Physical Review E
UR  - http://dx.doi.org/10.1103/PhysRevE.96.032801
UR  - http://hdl.handle.net/10044/1/51239
VL  - 96
ER  -
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