Hydrophobic diamond films

The peculiarities of wettability of diamond that was obtained in a nanostructured form as ultrananocrystalline diamond (UNCD) films by deposition from a gas phase are considered. Surface hydrogenation leads to hydrophobicity: advancing contact angle θ for UNCD films reaches 106 ± 1° (for diamond sin...

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Veröffentlicht in:Protection of metals and physical chemistry of surfaces 2013-05, Vol.49 (3), p.325-331
Hauptverfasser: Ostrovskaya, L. Yu, Ral’chenko, V. G., Vlasov, I. I., Khomich, A. A., Bol’shakov, A. P.
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container_end_page 331
container_issue 3
container_start_page 325
container_title Protection of metals and physical chemistry of surfaces
container_volume 49
creator Ostrovskaya, L. Yu
Ral’chenko, V. G.
Vlasov, I. I.
Khomich, A. A.
Bol’shakov, A. P.
description The peculiarities of wettability of diamond that was obtained in a nanostructured form as ultrananocrystalline diamond (UNCD) films by deposition from a gas phase are considered. Surface hydrogenation leads to hydrophobicity: advancing contact angle θ for UNCD films reaches 106 ± 1° (for diamond single crystals θ = 93°). Even higher values of θ equal to 124 ± 3° were detected for nanoporous samples of UNCD, in which a graphite-like component was removed by etching. High hydrophobicity is achieved owing to the specific surface morphology of the nanostructured diamond (anisotropic, with high content of nanopores) and chemical modification, which on the whole provides for very low values of free surface energy of the films. It was shown that laser-drilled microholes in polycrystalline diamond also can enhance the hydrophobicity. The wetting behavior of the nanostructured surfaces agrees well with the Cassie-Baxter equation for heterophase porous surfaces. The oxidation and hydrogenation of UNCD films allows controlling of θ in considerably wider ranges compared to single crystal diamond.
doi_str_mv 10.1134/S2070205113030118
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subjects Characterization and Evaluation of Materials
Chemistry and Materials Science
Coatings
Contact angle
Corrosion and Coatings
Hydrogenation
Hydrophobicity
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials
Materials Science
Mathematical analysis
Metallic Materials
Nanostructure
New Substances
Single crystals
Specific surface
Tribology
Wettability
title Hydrophobic diamond films
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