Rolling and slipping motion of a water droplet sandwiched between two parallel plates coated with fluoroalkylsilanes

Shunsuke Suzuki, Akira Nakajima, Munetoshi Sakai, Ayako Hashimoto, Naoya Yoshida, Yoshikazu Kameshima, Kiyoshi Okada

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Si plates were treated using two fluoroalkylsilanes (FAS17 and FAS3), and the internal fluidity of a water droplet sliding between two parallel plates on a slope was observed directly using particle image velocimetry (PIV) method with a high-speed camera system. The interfacial caterpillar-like rotation flows with slip motion at the solid-liquid interface were related to the combination of top and bottom wettabilities. The water droplets accelerated by a rolling and slipping motion on FAS17 coatings; the acceleration was dominated by a rolling motion on FAS3 coatings. A droplet's shape, solid-liquid molecular interaction, and the gravitic force will be important factors determining the sliding mode on a solid surface.

Original languageEnglish
Pages (from-to)3414-3420
Number of pages7
JournalApplied Surface Science
Volume255
Issue number5 PART 2
DOIs
Publication statusPublished - Dec 30 2008
Externally publishedYes

Keywords

  • Coatings
  • Hydrophobicity
  • Particle image velocimetry
  • Silane
  • Wetting

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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