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Droplet Morphology and Mobility on Lubricant-Impregnated Surfaces: A Molecular Dynamics Study.

07:00 EST 8th November 2019 | BioPortfolio

Summary of "Droplet Morphology and Mobility on Lubricant-Impregnated Surfaces: A Molecular Dynamics Study."

The slippery liquid-infused porous surfaces (SLIPS) are gaining remarkable attention and have advanced performance in many fields. Although all SLIPS are related to lubricant-impregnated within nano-/micro- structures on a surface, they differ in many aspects, such as the morphology of droplets, the state of cloaking, the wetting edge, the lubricant thickness, etc. Requirements of the droplet morphology on SLIPS might change according to a specific application. Molecular dynamics based numerical model that can correctly simulate the SLIPS is developed and it is validated by comparing against the theoretical predictions for all possible stable states for a given droplet, lubricant, and solid surface. Based on this model, detailed analysis of the equilibrium states is conducted. In particular, we discover that the four possible stable states on SLIPS predicted by theoretical studies can be extended to eight states by considering the effects of lubricant thickness and surface geometry in addition to the interfacial tension and surface wettability. These findings could be used to determine conditions under which thermodynamically stable state exists on SLIPS. The dynamic behavior of a nanodroplet on the SLIPS is also studied which provides insights into how a proper increase of the lubricant thickness might increase the sliding velocity. The above findings and developed model are expected to provide significant guidelines for designing SLIPS.

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This article was published in the following journal.

Name: Langmuir : the ACS journal of surfaces and colloids
ISSN: 1520-5827
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