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How do chemical patterns affect equilibrium droplet shapes?

Wu, Yanchen; Wang, Fei; Ma, Shaoping; Selzer, Michael; Nestler, Britta

Abstract:
By utilizing a proposed analytical model in combination with the phase-field method, we present a comprehensive study on the effect of chemical patterns on equilibrium droplet morphologies. Here, three influencing factors, the droplet sizes, contact angles, and the ratios of the hydrophilic area to the hydrophobic area, are contemplated. In the analytical model, chemical heterogeneities are described by different non-linear functions. By tuning these functions and the related parameters, the analytical model is capable of calculating the energy landscapes of the system. The chemically patterned surfaces display complex energy landscapes with chemical-heterogeneity-induced local minima, which correspond to the equilibrium morphologies of the droplets. Phase-field (PF) simulations are accordingly conducted and compared with the predicted equilibrium morphologies. In addition, we propose a modified Cassie–Baxter (CB) model to delineate the equilibrium droplet shapes. In contrast to the classic CB model, our extension is not only restricted to the shape with a spherical cap. Both the energy landscape method and the modified CB model are demonstrated to have a good agreement with the PF simulations.

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Verlagsausgabe §
DOI: 10.5445/IR/1000123857
Veröffentlicht am 18.09.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Computational Materials Science (IAM-CMS)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 14.07.2020
Sprache Englisch
Identifikator ISSN: 1744-683X, 1744-6848
KITopen-ID: 1000123857
Erschienen in Soft matter
Band 16
Heft 26
Seiten 6115–6127
Vorab online veröffentlicht am 27.05.2020
Nachgewiesen in Web of Science
Scopus
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