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Hydrophobic/hydrophilic switching on zinc oxide micro-textured surface
School of Engineering and Technology, Asian Institute of Technology, Thailand.ORCID iD: 0000-0002-0074-3504
2013 (English)In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 264, 344-348 p.Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
Elsevier, 2013. Vol. 264, 344-348 p.
National Category
Nano Technology
URN: urn:nbn:se:kth:diva-175203DOI: 10.1016/j.apsusc.2012.10.024ISI: 000312004800053ScopusID: 2-s2.0-84870574517OAI: diva2:914331

QC 20160414

Available from: 2016-03-23 Created: 2015-10-10 Last updated: 2016-04-14Bibliographically approved

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Dutta, Joydeep
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