Evaporation and condensation on two-tier superhydrophobic surfaces

Chuan Hua Chen, Qingjun Cai, Chung-Lung Chen*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

Superhydrophobic surfaces exhibit large contact angle and small hysteresis which promote liquid transport and enhance heat transfer. Here, liquid-vapor phase change behavior is reported on superhydrophobic surfaces with short carbon nanotubes deposited on micromachined posts, a two-tier texture mimicking the surface structure of lotus leaves. Compared to one-tier microtexture which energetically favors the Wenzel state, the two-tier texture with nanoscale roughness favors the Cassie state, the desired superhydrophobic state. During droplet evaporation, the two-tier texture delays the transition from Cassie to Wenzel state. Using two-tier texture with hexadeconethiol coating, continuous dropwise condensation was demonstrated for the first time on engineered superhydrophobic surfaces.

Original languageEnglish
Title of host publication2008 Proceedings of the ASME Micro/Nanoscale Heat Transfer International Conference, MNHT 2008
Pages1021-1022
Number of pages2
DOIs
StatePublished - 20 Aug 2008
Event1st ASME Micro/Nanoscale Heat Transfer International Conference, MNHT08 - Tainan, Taiwan
Duration: 6 Jan 20089 Jan 2008

Publication series

Name2008 Proceedings of the ASME Micro/Nanoscale Heat Transfer International Conference, MNHT 2008
VolumePART B

Conference

Conference1st ASME Micro/Nanoscale Heat Transfer International Conference, MNHT08
CountryTaiwan
CityTainan
Period6/01/089/01/08

Keywords

  • Biomimetics
  • Condensation
  • Evaporation
  • Superhydrophobic
  • Two-tier texture

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