Equilibrium Drop Shapes on a Tilted Substrate with a Chemical Step

Ivan Dević, José M. Encarnación Escobar, Detlef Lohse* (Corresponding Author)

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

We calculate the equilibrium shape of a droplet sitting on a tilted substrate with a "chemical step", that is, different lypophilicity at the two sides of the step. This problem can be generalized to that of a droplet experiencing a body force, pushing it from the lyophilic part to the lyophobic part of the substrate. We present phase diagrams, in which we show for which droplet sizes there are dynamically inaccessible equilibrium shapes. We also identify what determines the threshold volume. While this given system was studied previously in the literature using contact angle hysteresis laws, we present the full static thermodynamical solution of the interfacial energy including the contact energy, while omitting the hysteresis effects from the contact line.

Original languageEnglish
Pages (from-to)3880-3886
Number of pages7
JournalLangmuir
Volume35
Issue number11
Early online date14 Feb 2019
DOIs
Publication statusPublished - 19 Mar 2019

Keywords

  • UT-Hybrid-D

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