Edge Contact Angle and Modified Kelvin Equation for Condensation in Open Pores.
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F17%3A00482991" target="_blank" >RIV/67985858:_____/17:00482991 - isvavai.cz</a>
Alternative codes found
RIV/60461373:22340/17:43914989
Result on the web
<a href="http://dx.doi.org/10.1103/PhysRevE.96.020801" target="_blank" >http://dx.doi.org/10.1103/PhysRevE.96.020801</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevE.96.020801" target="_blank" >10.1103/PhysRevE.96.020801</a>
Alternative languages
Result language
angličtina
Original language name
Edge Contact Angle and Modified Kelvin Equation for Condensation in Open Pores.
Original language description
We consider capillary condensation transitions occurring in open slits of width L and finite height H immersed in a reservoir of vapor. In this case the pressure at which condensation occurs is closer to saturation compared to that occurring in an infinite slit (H = infinity) due to the presence of two menisci that are pinned near the open ends. Using macroscopic arguments, we derive a modified Kelvin equation for the pressure p(cc) (L, H) at which condensation occurs and show that the two menisci are characterized by an edge contact angle theta(e) that is always larger than the equilibrium contact angle theta, only equal to it in the limit of macroscopic H. For walls that are completely wet (theta = 0) the edge contact angle depends only on the aspect ratio of the capillary and is well described by theta e approximate to root pi L/2H for large H. Similar results apply for condensation in cylindrical pores of finite length. We test these predictions against numerical results obtained using a microscopic density-functional model where the presence of an edge contact angle characterizing the shape of the menisci is clearly visible from the density profiles. Below the wetting temperature T-w we find very good agreement for slit pores of widths of just a few tens of molecular diameters, while above T-w the modified Kelvin equation only becomes accurate for much larger systems.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
<a href="/en/project/GA17-25100S" target="_blank" >GA17-25100S: Geometrically and Chemically Modified Surfaces: From Statics to Dynamics</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2017
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review E
ISSN
2470-0045
e-ISSN
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Volume of the periodical
96
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
5
Pages from-to
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UT code for WoS article
000406912000001
EID of the result in the Scopus database
2-s2.0-85028717468