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Capillary Contact Angle in a Completely Wet Groove

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    0435408 - ÚCHP 2015 RIV US eng J - Journal Article
    Parry, A.O. - Malijevský, Alexandr - Rascón, C.
    Capillary Contact Angle in a Completely Wet Groove.
    Physical Review Letters. Roč. 113, č. 14 (2014), s. 146101. ISSN 0031-9007. E-ISSN 1079-7114
    R&D Projects: GA ČR GA13-09914S
    Grant - others:EPSRC UK(GB) EP/J009636/1; SSF(ES) FIS2010-22047-C05
    Institutional support: RVO:67985858
    Keywords : phase equilibria * wetting transitions * narrow pores
    Subject RIV: CF - Physical ; Theoretical Chemistry
    Impact factor: 7.512, year: 2014

    We consider the phase equilibria of a fluid confined in a deep capillary groove of width L with identical side walls and a bottom made of a different material. All walls are completely wet by the liquid. Using density functional theory and interfacial models, we show that the meniscus separating liquid and gas phases at two phase capillary coexistence meets the bottom capped end of the groove at a capillary contact angle theta(cap)(L) which depends on the difference between the Hamaker constants. If the bottom wall has a weaker wall-fluid attraction than the side walls, then theta(cap) > 0 even though all the isolated walls are themselves completely wet.
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