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UVstable-Zirconia nanotube coatings.pdf (1.44 MB)

Zirconia Nanotube Coatings - UV-Resistant Superhydrophobic Surfaces

preprint
submitted on 11.03.2021, 13:17 and posted on 16.03.2021, 09:04 by Swathi Naidu Vakamulla Raghu, Manuela S Killian, Khajidkhand Chuluunbandi
Surface modifications influence material interactions such as wettability, imparting hydrophobicity or hydrophilicity. Mainstream research focused on enhancing product shelf-life, directs attention towards superhydrophobic surfaces (SHS). SHS offer several benefits for outdoor applications such as self-cleaning, anti-soiling, anti-mist etc. In this manuscript, we explore the possibility of combining structural and chemical modifications to metal substrates in order to create superhydrophobic metal oxide surfaces. ZrO2-nanotubes are evaluated with regard to their application as transparent UV-stable superhydrophobic coatings. Nanostructured oxide surfaces are created via single-step electrochemical anodization. The absence of HF acid-based pre-etching steps offer a safe and alternatively a green synthesis route. Anodized oxides are modified using octadecylphosphonic acid self-assembled monolayers, demonstrate superhydrophobicity and are evaluated for their mechanical stability under a jet of water, chemical stability under indirect sunlight irradiation in air/water and direct UV exposure. Zirconia nanotubular films were evaluated for optical transparency using light microscopy and surface wettability of the different zirconia-composites was compared to the model system-titania. Structural and compositional differences of the SAM layer upon time dependent decay were analyzed with X-ray photoelectron spectroscopy.

Funding

The authors acknowledge the DFG researcher group FOR 1878 and KI 2169/2-1 for funding.

History

Email Address of Submitting Author

swathi.naidu@uni-siegen.de

Institution

University of Siegen

Country

Germany

ORCID For Submitting Author

0000-0001-8960-9581

Declaration of Conflict of Interest

There are no conflict of interests.

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