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Factors controlling the pinning force of liquid droplets on liquid infused surfaces

Sadullah, Muhammad Subkhi; Panter, Jack R.; Kusumaatmaja, Halim

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Authors

Muhammad Subkhi Sadullah

Jack R. Panter



Abstract

Liquid infused surfaces with partially wetting lubricants have recently been exploited for numerous intriguing applications, such as for droplet manipulation, droplet collection and spontaneous motion. When partially wetting lubricants are used, the pinning force is a key factor that can strongly affect droplet mobility. Here, we derive an analytical prediction for contact angle hysteresis in the limit where the meniscus size is much smaller than the droplet, and numerically study how it is controlled by the solid fraction, the lubricant wetting angles, and the various fluid surface tensions. We further relate the contact angle hysteresis and the pinning force experienced by a droplet on a liquid infused surface, and our predictions for the critical sliding angles are consistent with existing experimental observations. Finally, we discuss why a droplet on a liquid infused surface with partially wetting lubricants typically experiences stronger pinning compared to a droplet on a classical superhydrophobic surface.

Citation

Sadullah, M. S., Panter, J. R., & Kusumaatmaja, H. (2020). Factors controlling the pinning force of liquid droplets on liquid infused surfaces. Soft Matter, 16(35), 8114-8121. https://doi.org/10.1039/d0sm00766h

Journal Article Type Article
Acceptance Date Jul 21, 2020
Online Publication Date Jul 24, 2020
Publication Date 2020-09
Deposit Date Sep 23, 2020
Publicly Available Date Sep 23, 2020
Journal Soft Matter
Print ISSN 1744-683X
Electronic ISSN 1744-6848
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 16
Issue 35
Pages 8114-8121
DOI https://doi.org/10.1039/d0sm00766h
Public URL https://durham-repository.worktribe.com/output/1291745
Related Public URLs https://arxiv.org/abs/2007.12493

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