Droplet detachment force and its relation to Young-Dupre adhesion

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This paper numerically solves the Young-Laplace equation to predict droplet detachment force and shows it aligns with experimental data across various conditions, deriving an analytic solution for hydrophobic surfaces where it equals the Young-Dupre work of adhesion.

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The paper studies droplet detachment force from surfaces and how it relates to surface adhesion quantified by Young–Dupré work of adhesion, using numerical predictions based on solving the Young–Laplace equation. It reports agreement with previously reported experimental trends across many conditions, including droplets influenced by surface versus body forces, detachment forces spanning nano- to milli-newtons, droplet radii from tens of microns to millimeters, and different surface types such as micro/nano-structured superhydrophobic and lubricated surfaces. The authors derive an analytic expression for detachment force on highly hydrophobic surfaces and show that for receding contact angles greater than 120°, the normalized detachment force equals γ(1 + cos θr). This paper is centrally about a physical/adhesion framework and does not explicitly discuss endometriosis or adenomyosis; it was included in the corpus via a keyword match in the upstream search index.

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Abstract

Abstract Droplets adhere to surfaces due to their surface tension γ and understanding the vertical force Fd required to detach the droplet is key to many technologies (e.g., inkjet printing, optimal paint formulations). Here, we predicted Fd on different surfaces by numerically solving the Young-Laplace equation. Our numerical results are consistent with previously reported results for a wide range of experimental conditions: droplets subjected to surface vs. body forces with |Fd| ranging from nano- to milli-newtons, droplet radii R ranging from tens of microns to several millimetres, and for various surfaces (micro-/nano-structured superhydrophobic vs. lubricated surfaces). Finally, we derive an analytic solution for Fd on highly hydrophobic surfaces and further show that for receding contact angle θr > 120◦, the normalized Fd/πR is equivalent to the Young-Dupre work of adhesion γ(1 + cos θr).
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Here, we predicted F d on different surfaces by numerically solving the Young-Laplace equation. Our numerical results are consistent with previously reported results for a wide range of experimental conditions: droplets subjected to surface vs. body forces with | F d | ranging from nano- to milli-newtons, droplet radii R ranging from tens of microns to several millimetres, and for various surfaces (micro-/nano-structured superhydrophobic vs. lubricated surfaces). Finally, we derive an analytic solution for F d on highly hydrophobic surfaces and further show that for receding contact angle θ r > 120◦, the normalized F d /π R is equivalent to the Young-Dupre work of adhesion γ(1 + cos θ r ). Droplet adhesion Young-Dupre Full Text Additional Declarations Competing interests: The authors declare no competing interests. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. Our growing team is made up of researchers and industry professionals working together to solve the most critical problems facing scientific publishing. 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