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Updated: Jan 1, 2026

Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
Published on: June 14, 2019
Comment on "Comparison of the Lateral Retention Forces on Sessile, Pendant, and Inverted Sessile Drops"
Rafael Tadmor1, Sirui Tang, Chun-Wei Yao
1Department of Mechanical Engineering , Ben Gurion University , Beer Sheva , Israel.
Abstract:
Tadmor et al.'s 2009 PRL article shows experiments of pendant drops with ∼30% higher retention forces than their sessile analogues. A recent article (de la Madrid, R. et al. Langmuir 2019, 35, 2871) seemingly explains this result theoretically using a drastically different experimental system that shows a ∼3% higher force that exceeds the scatter in three out of four data points. The differences between the two experimental systems might have allowed the two theories to coexist, but Tadmor's theory, which can explain both, allows an understanding of the solid-liquid interaction, which the newer theory lacks.
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