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  Equilibrium drop shapes on a tilted substrate with a chemical step

Devic, I., Escobar, J. M. E., & Lohse, D. (2019). Equilibrium drop shapes on a tilted substrate with a chemical step. Langmuir, 35(11), 3880-3886. doi:10.1021/acs.langmuir.8b03557.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-0678-0 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-3564-1
Genre: Journal Article

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 Creators:
Devic, I., Author
Escobar, J. M. E., Author
Lohse, Detlef1, Author              
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1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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 Abstract: We calculate the equilibrium shape of a droplet sitting on a tilted substrate with a ''chemical step'', i.e., 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.

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Language(s): eng - English
 Dates: 2019-02-142019
 Publication Status: Published in print
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 Rev. Method: Peer
 Identifiers: DOI: 10.1021/acs.langmuir.8b03557
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Title: Langmuir
Source Genre: Journal
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Pages: - Volume / Issue: 35 (11) Sequence Number: - Start / End Page: 3880 - 3886 Identifier: -