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Open AccessArticle

Comparison of Properties of the Hybrid and Bilayer MWCNTs—Hydroxyapatite Coatings on Ti Alloy

1
Department of Materials Engineering and Bonding, Gdansk University of Technology, Narutowicza 11/12 str., 80-233 Gdansk, Poland
2
Institute of Optoelectronics, Military University of Technology, gen. Sylwestra Kaliskiego 2 str., 00-908 Warsaw, Poland
*
Author to whom correspondence should be addressed.
Coatings 2019, 9(10), 643; https://doi.org/10.3390/coatings9100643
Received: 16 September 2019 / Revised: 30 September 2019 / Accepted: 30 September 2019 / Published: 4 October 2019
(This article belongs to the Special Issue Recent Developments of Electrodeposition Coating)
Carbon nanotubes are proposed for reinforcement of the hydroxyapatite coatings to improve their adhesion, resistance to mechanical loads, biocompatibility, bioactivity, corrosion resistance, and antibacterial protection. So far, research has shown that all these properties are highly susceptible to the composition and microstructure of coatings. The present research is aimed at studies of multi-wall carbon nanotubes in three different combinations: multi-wall carbon nanotubes layer, bilayer coating composed of multi-wall carbon nanotubes deposited on nanohydroxyapatite deposit, and hybrid coating comprised of simultaneously deposited nanohydroxyapatite, multi-wall carbon nanotubes, nanosilver, and nanocopper. The electrophoretic deposition method was applied for the fabrication of the coatings. Atomic force microscopy, scanning electron microscopy and X-ray electron diffraction spectroscopy, and measurements of water contact angle were applied to study the chemical and phase composition, roughness, adhesion strength and wettability of the coatings. The results show that the pure multi-wall carbon nanotubes layer possesses the best adhesion strength, mechanical properties, and biocompatibility. Such behavior may be attributed to the applied deposition method, resulting in the high hardness of the coating and high adhesion of carbon nanotubes to the substrate. On the other hand, bilayer coating, and hybrid coating demonstrated insufficient properties, which could be the reason for the presence of soft porous hydroxyapatite and some agglomerates of nanometals in prepared coatings. View Full-Text
Keywords: hardness; adhesion; hydroxyapatite; carbon nanotubes; titanium; biomedical applications hardness; adhesion; hydroxyapatite; carbon nanotubes; titanium; biomedical applications
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MDPI and ACS Style

Majkowska-Marzec, B.; Rogala-Wielgus, D.; Bartmański, M.; Bartosewicz, B.; Zieliński, A. Comparison of Properties of the Hybrid and Bilayer MWCNTs—Hydroxyapatite Coatings on Ti Alloy. Coatings 2019, 9, 643.

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