Comment on "Comparison of the Lateral Retention Forces on Sessile, Pendant, and Inverted Sessile Drops"

Langmuir. 2020 Jan 14;36(1):475-476. doi: 10.1021/acs.langmuir.9b02660. Epub 2020 Jan 6.

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.