Apparent Contact Angle of Droplets on Liquid Infused Surfaces: Geometric Interpretation

Ciro Semprebon*, Muhammad Subkhi Sadullah, Glen McHale, Halim Kusumaatmaja

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We theoretically investigate the apparent contact angle of droplets on liquid infused surfaces as a function of the relative size of the wetting ridge and the deposited droplet. We provide an intuitive geometrical interpretation whereby the variation in the apparent contact angle is due to the rotation of the Neumann triangle at the lubricant-droplet-gas contact line. We also derive linear and quadratic corrections to the apparent contact angle as power series expansion in terms of pressure differences between the lubricant, droplet and gas phases. These expressions are much simpler and more compact compared to those previously derived by Semprebon et al. [Soft Matter, 2017, 13, 101-110].
Original languageEnglish
JournalSoft Matter
Early online date19 Aug 2021
Publication statusE-pub ahead of print - 19 Aug 2021


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