Evaporation of Droplets on Superhydrophobic Surfaces: Surface Roughness and Small Droplet Size Effects

Xuemei Chen, Ruiyuan Ma, Jintao Li, Chonglei Hao, Wei Guo, B. L. Luk, Shuai Cheng Li, Shuhuai Yao, and Zuankai Wang
Phys. Rev. Lett. 109, 116101 – Published 10 September 2012; Erratum Phys. Rev. Lett. 109, 129904 (2012)
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Abstract

Evaporation of a sessile droplet is a complex, nonequilibrium phenomenon. Although evaporating droplets upon superhydrophobic surfaces have been known to exhibit distinctive evaporation modes such as a constant contact line (CCL), a constant contact angle (CCA), or both, our fundamental understanding of the effects of surface roughness on the wetting transition remains elusive. We show that the onset time for the CCL-CCA transition and the critical base size at the Cassie-Wenzel transition exhibit remarkable dependence on the surface roughness. Through global interfacial energy analysis we reveal that, when the size of the evaporating droplet becomes comparable to the surface roughness, the line tension at the triple line becomes important in the prediction of the critical base size. Last, we show that both the CCL evaporation mode and the Cassie-Wenzel transition can be effectively inhibited by engineering a surface with hierarchical roughness.

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  • Received 10 January 2012
  • Publisher error corrected 12 September 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.116101

© 2012 American Physical Society

Corrections

12 September 2012

Erratum

Publisher’s Note: Evaporation of Droplets on Superhydrophobic Surfaces: Surface Roughness and Small Droplet Size Effects [Phys. Rev. Lett. 109, 116101 (2012)]

Xuemei Chen, Ruiyuan Ma, Jintao Li, Chonglei Hao, Wei Guo, B. L. Luk, Shuai Cheng Li, Shuhuai Yao, and Zuankai Wang
Phys. Rev. Lett. 109, 129904 (2012)

Authors & Affiliations

Xuemei Chen1, Ruiyuan Ma2, Jintao Li1, Chonglei Hao1, Wei Guo1, B. L. Luk1, Shuai Cheng Li3, Shuhuai Yao2, and Zuankai Wang1,*

  • 1Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Hong Kong 999077, China
  • 2Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China
  • 3Department of Computer Science, City University of Hong Kong, Hong Kong 999077, China

  • *Corresponding author. zuanwang@cityu.edu.hk

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Issue

Vol. 109, Iss. 11 — 14 September 2012

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