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Breaking Cassie’s Law for Condensation in a Nanopatterned Slit.

SYSNO ASEP	0541155
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Breaking Cassie’s Law for Condensation in a Nanopatterned Slit.
Author(s)	Láska, Martin (UCHP-M)_{ORCID, RID, SAI} Parry, A.O. (GB) Malijevský, Alexandr (UCHP-M)_{RID, ORCID, SAI}
Article number	125701
Source Title	Physical Review Letters. - : American Physical Society - ISSN 0031-9007 Roč. 126, č. 12 (2021)
Number of pages	5 s.
Language	eng - English
Country	US - United States
Keywords	capilary condensation ; phase-equilibria ; nerrow pores
Subject RIV	BE - Theoretical Physics
OECD category	Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)
R&D Projects	GA20-14547S GA ČR - Czech Science Foundation (CSF)
Method of publishing	Open access
Institutional support	UCHP-M - RVO:67985858
UT WOS	000646119900015
EID SCOPUS	85103442160
DOI	10.1103/PhysRevLett.126.125701
Annotation	We study the phase transitions of a fluid confined in a capillary slit made from two adjacent walls, each of which are a periodic composite of stripes of two different materials. For wide slits the capillary condensation occurs at a pressure which is described accurately by a combination of the Kelvin equation and the Cassie law for an averaged contact angle. However, for narrow slits the condensation occurs in two steps involving an intermediate bridging phase, with the corresponding pressures described by two new Kelvin equations. These are characterised by different contact angles due to interfacial pinning, with one larger and one smaller than the Cassie angle. We determine the triple point and predict two types of dispersion force induced Derjaguin-like corrections due to mesoscopic volume reduction and the singular free-energy contribution from nanodroplets and bubbles. We test these predictions using a fully microscopic density functional model which confirms their validity even for molecularly narrow slits. Analogous mesoscopic corrections are also predicted for two-dimensional systems arising from thermally induced interfacial wandering.
Workplace	Institute of Chemical Process Fundamentals
Contact	Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227
Year of Publishing	2022
Electronic address	https://spiral.imperial.ac.uk:8443/bitstream/10044/1/88421/2/slit_periodic_letter2.pdf

Number of the records: 1