Superhydrophobic surfaces using selected zinc oxide microrod growth on ink-jetted patterns

Myint, Myo Tay Zar; Kitsomboonloha, Rungrot; Baruah, Sunandan; Dutta, Joydeep

doi:10.1016/j.jcis.2010.11.004

Cited by 51 publications

(28 citation statements)

References 50 publications

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“…However, ZnO can be used to prepare hydrophobic surfaces by creating hierarchical structures and roughening the surfaces [31,32]. There exist two types of superhydrophobic surfaces, low and high water-adhesion super-hydrophobicity [33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Water-resistant surfaces using zinc oxide structured nanorod arrays with switchable wetting property

Ennaceri

Wang

Erfurt

et al. 2016

Surface and Coatings Technology

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Abstract.This study presents an experimental approach for fabricating super-hydrophobic coatings based on a dual roughness structure composed of zinc oxide nanorod arrays coated with a sputtered zinc oxide nano-layer. The ZnO nanorod arrays were grown by mean of low-temperature electrochemical deposition technique (75°C) on FTO substrates with pre-sputtered ZnO seed layer of 30 nm thickness. The ZnO nanorods show a (002) orientation along the c-axis, and have a hexagonal structure, with an average length of 710 nm, and average width of 156 nm. On the other hand, the crystallite size of the top-coating sputtered ZnO layer is of 30 nm. The as-deposited ZnO nanorod arrays exhibited a hydrophobic behavior, with a surface water contact angle of 108°, whereas the dual-scale roughness ZnO nanorods coated with sputtered ZnO exhibited a superhydrophobic behavior, with a surface water contact angle of 157° and high water droplet adhesion. The photo-catalytic degradation of methylene blue in the presence of both the single roughness ZnO nanorod arrays, and dual roughness structured ZnO. The ZnO nanorod arrays showed good activity, with a degradation efficiency of 50% and a degradation constant of (k = 0.00225 min -1 ) after 5 hours of UV illumination. On the other hand, the ZnO dual roughness structure prepared by sputtered ZnO on top of the ZnO nanorod arrays showed minimal activity, with a degradation efficiency of 16% and a degradation constant of (k = 0.000586 min -1 ) after 5 hours of UV exposure. The double structured films exhibited high sensitivity to UV light, with a UV-induced switching behavior from super-hydrophobic to super-hydrophilic after only 30 minutes of UV exposure.Key Words: Super-hydrophobic, water contact angle, zinc oxide, nanorod arrays, rose petal effect, photo-catalysis. Highlights Hydrophobic ZnO nanorod arrays with high water-adhesion are achieved. Sputtered ZnO top-coating is used to reach super-hydrophobicity. Switchable wettability for ZnO single and dual roughness films under UV exposure. Strong pinning to the surface, similar to the rose-petal effect. The higher WCA is responsible for the decrease in the photo-catalysis activity.

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Section: Introductionmentioning

confidence: 99%

Water-resistant surfaces using zinc oxide structured nanorod arrays with switchable wetting property

Ennaceri

Wang

Erfurt

et al. 2016

Surface and Coatings Technology

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show abstract

“…Wang et al used thermally evaporated patterned gold particles catalysts for the selective growth of ZnO nanorods [21]. In contrast, ink-jet printing of ZnO nanoparticles [26] or a zinc acetate precursor [27,28] has been used to produce ZnO nanorod patterns. Yi et al utilized a gallium nitride (GaN) epitaxial layer for the patterned growth of a vertically aligned ZnO nanorod array [29].…”

Section: Introductionmentioning

confidence: 99%

Patterned growth of zinc oxide nanorods using poly(vinyl alcohol)-N-methyl-4(4′-formylstyryl)pyridinium methosulfate acetal and zinc acetate mixture as a seed layer

Choi

Kim

Park

et al. 2015

Current Applied Physics

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“…The mean length of ZnO nanorods is 3-4 μm, while the mean diameter of ZnO nanorods and Cu 2 O nanoparticles is about 400 nm and 50 nm, respectively. Namely, these ZnO plus Cu 2 O superstructures are characteristic of micro-nano compound structures, which is propitious to enhance the hydrophobicity [27].…”

Section: Surface Structures Of Zno Nanorod Arraysmentioning

confidence: 99%

“…In this case, the Cassie-Baxter model is suitable to explain the superhydrophobicity because the large fraction of air entrapped within the interstices of ZnO nanorods and Cu 2 O nanoparticles largely increases the water/air interface and effectively prevents the penetration of water droplets into the interstices. Based on Cassie-Baxter model, the wettability of a solid surface can be expressed as [27]:…”

Section: Change Of Surface Wettability Of Zno Nanorod Arraysmentioning

confidence: 99%

Design and understanding of superhydrophobic ZnO nanorod arrays with controllable water adhesion

Xue

Wang

et al. 2014

Surface and Coatings Technology

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Superhydrophobic surfaces using selected zinc oxide microrod growth on ink-jetted patterns

Cited by 51 publications

References 50 publications

Water-resistant surfaces using zinc oxide structured nanorod arrays with switchable wetting property

Water-resistant surfaces using zinc oxide structured nanorod arrays with switchable wetting property

Patterned growth of zinc oxide nanorods using poly(vinyl alcohol)-N-methyl-4(4′-formylstyryl)pyridinium methosulfate acetal and zinc acetate mixture as a seed layer

Design and understanding of superhydrophobic ZnO nanorod arrays with controllable water adhesion

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