Hydrophobicity and freezing of a water droplet on fluoroalkylsilane coatings with different roughnesses

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

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Smooth (Ra ≈ 0.1 nm) and rough (Ra ≈ 20 nm) coatings of 1H,1H,2H,2H-perfluorodecyltrimethoxysilane (FAS17) were prepared by controlling process conditions. The water contact angles for the smooth and rough coatings were similar (107° and 110°, respectively), but their sliding angles differed considerably (10° and 27°, respectively). The surface potential on the smooth coating, assessed using Kelvin force microscopy, showed a sharp distribution, but that on the rough coating ranged widely, implying large chemical heterogeneity including residual SiOH groups. The freezing temperature of a supercooled water droplet on the rough coating was higher than that on the smooth coating.

Original languageEnglish
Pages (from-to)8674-8677
Number of pages4
JournalLangmuir
Volume23
Issue number17
DOIs
Publication statusPublished - Aug 14 2007
Externally publishedYes

ASJC Scopus subject areas

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

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