Rapid Deceleration-Driven Wetting Transition during Pendant Drop Deposition on Superhydrophobic Surfaces

Hyuk-Min Kwon, Adam T. Paxson, Kripa K. Varanasi, and Neelesh A. Patankar
Phys. Rev. Lett. 106, 036102 – Published 20 January 2011
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Abstract

A hitherto unknown mechanism for wetting transition is reported. When a pendant drop settles upon deposition, there is a virtual “collision” where its center of gravity undergoes rapid deceleration. This induces a high water hammer-type pressure that causes wetting transition. A new phase diagram shows that both large and small droplets can transition to wetted states due to the new deceleration driven and the previously known Laplace mechanisms, respectively. It is explained how the attainment of a nonwetted Cassie-Baxter state is more restrictive than previously known.

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  • Received 26 July 2010

DOI:https://doi.org/10.1103/PhysRevLett.106.036102

© 2011 American Physical Society

Authors & Affiliations

Hyuk-Min Kwon1, Adam T. Paxson1, Kripa K. Varanasi1,*, and Neelesh A. Patankar2,†

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA
  • 2Department of Mechanical Engineering, Northwestern University, 2145 Sheridan Road, B224, Evanston, Illinois 60208–3111, USA

  • *Corresponding author. varanasi@mit.edu
  • Corresponding author. n-patankar@northwestern.edu

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Issue

Vol. 106, Iss. 3 — 21 January 2011

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