Bistable nature of the hydrophobic contact angle on rough surfaces

Bo He*, Neelesh A. Patankar, Junghoon Lee

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


This paper studies the bistable nature of the hydrophobic contact angle on the rough surfaces. It was experimentally shown that a droplet of liquid can form two different contact angles on a surface that has roughness patterns. External disturbances can cause a transition between the two different energy states. This paper verifies the theoretical prediction by matching experiments and establishes a design criterion for a robust hydrophobic rough surface on which the contact angle will not change due to external disturbances. This fact is critical in microfluidic applications, where a rough surface is used for applications based on wettability amplification.

Original languageEnglish (US)
Title of host publicationMicro-Electro-Mechanical Systems (MEMS) - 2003
PublisherAmerican Society of Mechanical Engineers
Number of pages5
ISBN (Print)0791837211, 9780791837214
StatePublished - 2003
Event2003 ASME International Mechanical Engineering Congress - Washington, DC, United States
Duration: Nov 15 2003Nov 21 2003

Publication series

NameAmerican Society of Mechanical Engineers, Micro-Electromechanical Systems Division Publication (MEMS)


Other2003 ASME International Mechanical Engineering Congress
Country/TerritoryUnited States
CityWashington, DC


  • Hydrophobic contact angle
  • Rough surface

ASJC Scopus subject areas

  • Engineering(all)


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