Robust Hydrophobic Surfaces from Suspension HVOF Thermal Sprayed Rare-Earth Oxide Ceramics Coatings

Abstract This study has presented an efficient coating method, namely suspension high velocity oxy-fuel (SHVOF) thermal spraying, to produce large super-hydrophobic ceramic surfaces with a unique micro- and nano-scale hierarchical structures to mimic natural super-hydrophobic surfaces. CeO2 was sele...

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Autores principales:	M. Bai, H. Kazi, X. Zhang, J. Liu, T. Hussain
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2018
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/346b0aba26d54a8ba0d432cca87b1565
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spelling	oai:doaj.org-article:346b0aba26d54a8ba0d432cca87b15652021-12-02T12:31:56ZRobust Hydrophobic Surfaces from Suspension HVOF Thermal Sprayed Rare-Earth Oxide Ceramics Coatings10.1038/s41598-018-25375-y2045-2322https://doaj.org/article/346b0aba26d54a8ba0d432cca87b15652018-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-25375-yhttps://doaj.org/toc/2045-2322Abstract This study has presented an efficient coating method, namely suspension high velocity oxy-fuel (SHVOF) thermal spraying, to produce large super-hydrophobic ceramic surfaces with a unique micro- and nano-scale hierarchical structures to mimic natural super-hydrophobic surfaces. CeO2 was selected as coatings material, one of a group of rare-earth oxide (REO) ceramics that have recently been found to exhibit intrinsic hydrophobicity, even after exposure to high temperatures and abrasive wear. Robust hydrophobic REO ceramic surfaces were obtained from the deposition of thin CeO2 coatings (3–5 μm) using an aqueous suspension with a solid concentration of 30 wt.% sub-micron CeO2 particles (50–200 nm) on a selection of metallic substrates. It was found that the coatings’ hydrophobicity, microstructure, surface morphology, and deposition efficiency were all determined by the metallic substrates underneath. More importantly, it was demonstrated that the near super-hydrophobicity of SHVOF sprayed CeO2 coatings was achieved not only by the intrinsic hydrophobicity of REO but also their unique hierarchically structure. In addition, the coatings’ surface hydrophobicity was sensitive to the O/Ce ratio, which could explain the ‘delayed’ hydrophobicity of REO coatings.M. BaiH. KaziX. ZhangJ. LiuT. HussainNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q M. Bai H. Kazi X. Zhang J. Liu T. Hussain Robust Hydrophobic Surfaces from Suspension HVOF Thermal Sprayed Rare-Earth Oxide Ceramics Coatings
description	Abstract This study has presented an efficient coating method, namely suspension high velocity oxy-fuel (SHVOF) thermal spraying, to produce large super-hydrophobic ceramic surfaces with a unique micro- and nano-scale hierarchical structures to mimic natural super-hydrophobic surfaces. CeO2 was selected as coatings material, one of a group of rare-earth oxide (REO) ceramics that have recently been found to exhibit intrinsic hydrophobicity, even after exposure to high temperatures and abrasive wear. Robust hydrophobic REO ceramic surfaces were obtained from the deposition of thin CeO2 coatings (3–5 μm) using an aqueous suspension with a solid concentration of 30 wt.% sub-micron CeO2 particles (50–200 nm) on a selection of metallic substrates. It was found that the coatings’ hydrophobicity, microstructure, surface morphology, and deposition efficiency were all determined by the metallic substrates underneath. More importantly, it was demonstrated that the near super-hydrophobicity of SHVOF sprayed CeO2 coatings was achieved not only by the intrinsic hydrophobicity of REO but also their unique hierarchically structure. In addition, the coatings’ surface hydrophobicity was sensitive to the O/Ce ratio, which could explain the ‘delayed’ hydrophobicity of REO coatings.
format	article
author	M. Bai H. Kazi X. Zhang J. Liu T. Hussain
author_facet	M. Bai H. Kazi X. Zhang J. Liu T. Hussain
author_sort	M. Bai
title	Robust Hydrophobic Surfaces from Suspension HVOF Thermal Sprayed Rare-Earth Oxide Ceramics Coatings
title_short	Robust Hydrophobic Surfaces from Suspension HVOF Thermal Sprayed Rare-Earth Oxide Ceramics Coatings
title_full	Robust Hydrophobic Surfaces from Suspension HVOF Thermal Sprayed Rare-Earth Oxide Ceramics Coatings
title_fullStr	Robust Hydrophobic Surfaces from Suspension HVOF Thermal Sprayed Rare-Earth Oxide Ceramics Coatings
title_full_unstemmed	Robust Hydrophobic Surfaces from Suspension HVOF Thermal Sprayed Rare-Earth Oxide Ceramics Coatings
title_sort	robust hydrophobic surfaces from suspension hvof thermal sprayed rare-earth oxide ceramics coatings
publisher	Nature Portfolio
publishDate	2018
url	https://doaj.org/article/346b0aba26d54a8ba0d432cca87b1565
work_keys_str_mv	AT mbai robusthydrophobicsurfacesfromsuspensionhvofthermalsprayedrareearthoxideceramicscoatings AT hkazi robusthydrophobicsurfacesfromsuspensionhvofthermalsprayedrareearthoxideceramicscoatings AT xzhang robusthydrophobicsurfacesfromsuspensionhvofthermalsprayedrareearthoxideceramicscoatings AT jliu robusthydrophobicsurfacesfromsuspensionhvofthermalsprayedrareearthoxideceramicscoatings AT thussain robusthydrophobicsurfacesfromsuspensionhvofthermalsprayedrareearthoxideceramicscoatings
_version_	1718394208554844160

Robust Hydrophobic Surfaces from Suspension HVOF Thermal Sprayed Rare-Earth Oxide Ceramics Coatings

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