Hydrophobic/hydrophilic switching on zinc oxide micro-textured surface

Myo Tay Zar Myint, Nithin Senthur Kumar, Gabor Louis Hornyak, Joydeep Dutta*

*Corresponding author for this work

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Switchable wettability of zinc oxide (ZnO) microrod coated surfaces was controlled in two different ways: (1) by physical geometry (surface coverage area SA: the area covered by solid) and (2) by irradiation with ultraviolet (UV) light followed by infrared (IR) or furnace heating. In the first approach, the threshold coverage area for achieving hydrophobic surfaces was found to be <40%, which is in good agreement with predicted values in the literature leading to a metastable Cassie-Baxter regime. The transformation of hydrophobic to hydrophilic surfaces was studied by alternating cycles of 3 h exposure to ultraviolet (λpeak ∼ 253 nm) light followed by 1 h of annealing or IR irradiation alone. Three different annealing temperatures (120 °C, 200 °C and 250 °C) were utilized. Results of this work can be applied for designing surfaces with controlled wettability.

Original languageEnglish
Pages (from-to)344-348
Number of pages5
JournalApplied Surface Science
Volume264
DOIs
Publication statusPublished - Jan 1 2013

Keywords

  • Annealing
  • Hydrophilic
  • Hydrophobic
  • Microrod
  • Ultraviolet
  • Zinc oxide

ASJC Scopus subject areas

  • Surfaces, Coatings and Films

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