Direct observation of internal fluidity in a water droplet during sliding on hydrophobic surfaces

Munetoshi Sakai, Jeong Hwan Song, Naoya Yoshida, Shunsuke Suzuki, Yoshikazu Kameshima, Akira Nakajima

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

In the current study, we used a high-speed camera system with particle image velocimetry to observe the internal fluidity of water droplets during sliding. The droplets' velocity during sliding was controlled by slipping and rolling motions. On the superhydrophobic surface, with a contact angle of 150°, the droplet fell at high velocity by slipping. However, on a normal hydrophobic surface whose water contact angle was around 100°, both slipping and rolling controlled the droplet's velocity during sliding. In addition, the advancing velocity might be large when the slip velocity is large and the contact area is small.

Original languageEnglish
Pages (from-to)4906-4909
Number of pages4
JournalLangmuir
Volume22
Issue number11
DOIs
Publication statusPublished - May 23 2006
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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