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Enhanced Dip Coating on a Soft Substrate

Abstract : A solid, withdrawn from a liquid bath, entrains a thin liquid film. This simple process, first described by Landau, Levich and Derjaguin (LLD), is commonly observed in everyday life. It also plays a central role in liquid capture by animals, and is widely used for surface-coating purposes in industry. Motivated by the emerging interest in the mechanics of very soft materials, and in particular the resulting elastocapillary coupling, we develop a dip-coating model that accounts for the additional presence of a soft solid layer atop the rigid plate. The elastic response of this soft layer is described by a Winkler’s foundation. Using a combination of numerical, scaling and asymptotic- matching methods, we find a new softness-dependent power-law regime for the thickness of entrained liquid at small capillary number, which corresponds to a modified physics at play in the dynamic meniscus. The crossover between this regime and the classical dip-coating one occurs when the substrate’s deformation is comparable to the thickness of the entrained liquid film.
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https://hal.archives-ouvertes.fr/hal-03586837
Contributor : Vincent Bertin Connect in order to contact the contributor
Submitted on : Thursday, February 24, 2022 - 10:44:50 AM
Last modification on : Thursday, June 23, 2022 - 11:00:10 AM

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  • HAL Id : hal-03586837, version 1
  • ARXIV : 2203.00322

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Vincent Bertin, Jacco Snoeijer, Elie Raphaël, Thomas Salez. Enhanced Dip Coating on a Soft Substrate. 2022. ⟨hal-03586837⟩

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