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Interfacial Phenomena and Heat Transfer
ESCI SJR: 0.258 SNIP: 0.574 CiteScore™: 0.8

ISSN Imprimir: 2169-2785
ISSN On-line: 2167-857X

Interfacial Phenomena and Heat Transfer

DOI: 10.1615/InterfacPhenomHeatTransfer.2018025483
pages 113-128

COMPARABLE EFFECTS OF ADSORPTION AND LINE TENSION ON CONTACT ANGLE OF A NUCLEATED DROPLET ON A PARTIALLY WETTABLE SUBSTRATE

Dmitry V. Tatyanenko
St. Petersburg State University, 7–9 Universitetskaya nab., St. Petersburg, 199034, Russia
Alexander K. Shchekin
St. Petersburg State University, 7–9 Universitetskaya nab., St. Petersburg, 199034, Russia

RESUMO

Thermodynamics of a small sessile droplet on a solid substrate is discussed with a focus on size dependence of its contact angle. An interface displacement (ID) model is employed to calculate profiles and contact angles of sessile droplets representing, in particular, critical droplets in nucleation on a partially wettable solid substrate. Line-tension and adsorption-related corrections to the contact angle cosine are found within the ID model and illustrated with numeric calculations for a short-range interface potential. The line tension and adsorption effects on the contact angle are shown to be comparable even in the first order in the contact line curvature. For smaller droplets, an intrinsic dependence of the line tension on the contact line curvature also becomes significant for the contact angle.


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