Capillary force restoration of droplet on superhydrophobic ribbed nano-needles arrays

Qinwen Chen; Xi Yao; Liang Xu; Qikai Li; Yanlin Song; Lei Jiang

doi:10.1039/b925988k

Capillary force restoration of droplet on superhydrophobic ribbed nano-needles arrays

Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review

Overview

9 Scopus Citations

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Author(s)

Qinwen Chen
Liang Xu
Qikai Li
Yanlin Song
Lei Jiang

Detail(s)

Original language	English
Pages (from-to)	2470-2474
Journal / Publication	Soft Matter
Volume	6
Issue number	11
Publication status	Published - 7 Jun 2010
Externally published	Yes

Link(s)

DOI	DOI https://doi.org/10.1039/b925988k Final Published version
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Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-77952789041&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(54a395e4-c788-4ba6-abe2-d4ca42cfbdcc).html

Abstract

Previous experiments have observed squeezing and relaxing droplets between two identical superhydrophobic surfaces decorated by the ribbed nano-needles arrays (RNNA) leading to a fully reversible dynamic process. This reversibility presents a capillary force restoration accompanying deformation of the water droplet, which mainly depends on the surface microstructures. Based on the quasi-static equilibrium of droplet compression, we have deduced and numerically computed the capillary force utilizing a classical mechanics approach. The simulated forces agree well with the experimental results. The restoration mechanism is further explored and revealed by the calculated microscopic contact angle and the liquid-air interface around the nanoneedles. © 2010 The Royal Society of Chemistry.