Drop Friction on Textured Lubricant-Coated Surfaces
Xiaoyu Chen, Biruk Teka Gidreta, Tanner Gaw, Michal Remer, Dan Daniel, Xiaoguang Wang, Solomon Adera
TL;DR
This study explores how liquid droplets interact with textured lubricant-coated surfaces, revealing how pillar height and density affect drop friction.
Contribution
The study provides new insights into the presence of a lubricant film on tall dense pillars, contradicting previous findings.
Findings
Drop friction on tall dense pillars is comparable to short pillars due to a lubricant film.
The critical pillar density for the friction transition is approximately 50%.
Friction on microholes and micropillars is similar when solid fraction is the same.
Abstract
Understanding drop friction on textured surfaces has implications in microfluidics and lab-on-a-chip devices. In this work, we investigated the drop friction on lubricant-coated pillars by systematically varying pillar height and density. First, we measured the friction force on a moving drop using a cantilever force sensor that has ±0.1 μN sensitivity. This measurement shows that drop friction on tall dense pillars is comparable to drop friction on short pillars, a significant result that suggests the presence of a Landau–Levich–Derjaguin (LLD) film underneath the moving drop. Second, we validated the force measurement by estimating the lubricant layer thickness by using white-light interferometry. Third, we visualized the lubricant film underneath the moving drop using reflection interference contrast microscopy. The three independent diagnostic tools and measurement techniques…
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Taxonomy
TopicsSurface Modification and Superhydrophobicity · Adhesion, Friction, and Surface Interactions · Tribology and Lubrication Engineering