Sliding acceleration of water droplets on a surface coated with fluoroalkylsilane and octadecyltrimethoxysilane

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

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Both fluoroalkylsilane (FAS) and octadecyltrimethoxysilane (ODS) were coated on oxidized silicon wafers using soaking and CVD method. Smooth coatings with Ra values of less than 1 nm were attained. The slope of the sliding acceleration against the inverse of the droplet mass showed an inflection point. That point shifted to the direction of smaller droplets with decreasing FAS ratio to ODS. The water droplets' length was increased when the sliding velocity was increased. Fluoroalkylsilane addition to ODS increases the interaction between water and the hydrophobic surface. Results showed that the sliding acceleration of a water droplet depends strongly on the surface ratio of these silanes.

Original languageEnglish
Pages (from-to)2214-2219
Number of pages6
JournalSurface Science
Issue number10
Publication statusPublished - May 15 2006
Externally publishedYes


  • Acceleration
  • Coating
  • Hydrophobic
  • Silanes
  • Silicon
  • Sliding angle
  • Velocity
  • Water
  • Wetting

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry


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