Sliding behavior of water droplets on line-patterned hydrophobic surfaces

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

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

We prepared line-patterned hydrophobic surfaces using fluoroalkylsilane (FAS) and octadecyltrimethoxysilane (ODS) then investigated the effect of line direction on sliding behavior of water droplets by direct observation of the actual droplet motion during sliding. Water droplets slide down with a periodic large deformation of the contact line and sliding velocity fluctuation that occurred when they crossed over the 500-μm ODS line regions in FAS regions on a Si surface tilted at 35°. These behaviors are less marked for motion on a 100-μm line surface, or on lines oriented parallel to the slope direction. Smaller droplets slide down with greater displacement in the line direction on 500-μm line patterning when the lines were rotated at 13° in-plane for the slope direction. This sliding behavior depended on the droplet size and rotation angle, and is accountable by the balance between gravitational and retentive forces.

Original languageEnglish
Pages (from-to)1797-1805
Number of pages9
JournalApplied Surface Science
Volume254
Issue number6
DOIs
Publication statusPublished - Jan 15 2008
Externally publishedYes

Keywords

  • Coatings
  • Hydrophobicity
  • Photolithography
  • Silane
  • Surface patterning
  • 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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  • Cite this

    Suzuki, S., Nakajima, A., Tanaka, K., Sakai, M., Hashimoto, A., Yoshida, N., Kameshima, Y., & Okada, K. (2008). Sliding behavior of water droplets on line-patterned hydrophobic surfaces. Applied Surface Science, 254(6), 1797-1805. https://doi.org/10.1016/j.apsusc.2007.07.171