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Edge Contact Angle, Capillary Condensation, and Meniscus Depinning.
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SYSNO ASEP 0545672 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Edge Contact Angle, Capillary Condensation, and Meniscus Depinning. Author(s) Malijevský, Alexandr (UCHP-M) RID, ORCID, SAI
Parry, A.O. (GB)Article number 115703 Source Title Physical Review Letters. - : American Physical Society - ISSN 0031-9007
Roč. 127, č. 11 (2021)Number of pages 5 s. Language eng - English Country US - United States Keywords transition ; phase equilibria ; capillary condensation 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 with time embargo (09.09.2022) Institutional support UCHP-M - RVO:67985858 UT WOS 000694048000003 EID SCOPUS 85114873218 DOI 10.1103/PhysRevLett.127.115703 Annotation We study the phase equilibria of a fluid confined in an open capillary slit formed when a wall of finite length H is brought a distance L away from a second macroscopic surface. This system shows rich phase equilibria arising from the competition between two different types of capillary condensation, corner filling and meniscus depinning transitions depending on the value of the aspect ratio a=L/H. For long capillaries, with a<2/π, the condensation is of type I involving menisci which are pinned at the top edges at the ends of the capillary characterized by an edge contact angle. For intermediate capillaries, with 2/π1, condensation is always of type II. In all regimes, capillary condensation is completely suppressed for sufficiently large contact angles. We show that there is an additional continuous phase transition in the condensed liquidlike phase, associated with the depinning of each meniscus as they round the upper open edges of the slit. Finite-size scaling predictions are developed for these transitions and phase boundaries which connect with the fluctuation theories of wetting and filling transitions. We test several of our predictions using a fully microscopic density functional theory which allows us to study the two types of capillary condensation and its suppression at the molecular level. Workplace Institute of Chemical Process Fundamentals Contact Eva Jirsová, jirsova@icpf.cas.cz, Tel.: 220 390 227 Year of Publishing 2022 Electronic address http://hdl.handle.net/11104/0322350
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