Effect of Surfactants on Longevity of Submerged Superhydrophobic Surfaces
Ankit Gupta, Hangjian Ling
TL;DR
This study shows how surfactants can either extend or shorten the lifespan of superhydrophobic surfaces underwater, depending on their concentration.
Contribution
The novel contribution is the experimental demonstration of surfactant effects on SHS longevity across multiple surfactant types and surface geometries.
Findings
High surfactant concentrations cause sudden wetting transitions, reducing SHS longevity.
Low surfactant concentrations increase SHS longevity by reducing mass transfer.
The effect was consistent across four surfactants and three surface geometries.
Abstract
The gas trapped on a submerged superhydrophobic surface (SHS) could diffuse into the surrounding liquid, reducing the SHS longevity. Although surfactants are known to inhibit mass transfer between gas and liquid phases, their influence on SHS longevity remains unclear. In this work, we experimentally investigate the effect of surfactants on the mass transfer from the SHS to the surrounding liquid and the resulting SHS longevity. Four surfactants, 1-pentanol, Triton X-100, 2-propanol, and methanol, were tested over a range of concentrations and on three types of SHS texture geometries: microholes, microposts, and a randomly roughed texture. We found that at sufficiently high surfactant concentrations, the SHS longevity decreased significantly due to a sudden wetting transition triggered probably by surface energy minimization. In contrast, at low surfactant concentrations, the SHS…
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Taxonomy
TopicsSurface Modification and Superhydrophobicity · Membrane Separation Technologies · Fluid Dynamics and Thin Films