Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Functionalizing Diatomite-Based Micro-Arc Coatings for Orthopedic Implants: Influence of TiO2 Addition

Version 1 : Received: 1 June 2023 / Approved: 2 June 2023 / Online: 2 June 2023 (07:51:49 CEST)

A peer-reviewed article of this Preprint also exists.

Kashin, A.D.; Sedelnikova, M.B.; Uvarkin, P.V.; Ugodchikova, A.V.; Luginin, N.A.; Sharkeev, Y.P.; Khimich, M.A.; Bakina, O.V. Functionalizing Diatomite-Based Micro-Arc Coatings for Orthopedic Implants: Influence of TiO2 Addition. Biomimetics 2023, 8, 280. Kashin, A.D.; Sedelnikova, M.B.; Uvarkin, P.V.; Ugodchikova, A.V.; Luginin, N.A.; Sharkeev, Y.P.; Khimich, M.A.; Bakina, O.V. Functionalizing Diatomite-Based Micro-Arc Coatings for Orthopedic Implants: Influence of TiO2 Addition. Biomimetics 2023, 8, 280.

Abstract

The method of micro-arc oxidation has been utilized to synthesize a protective biocompatible coating for a bioresorbable orthopedic Mg implant. This paper presents the results of a comprehensive research of micro-arc coatings based on diatomite – a biogenic material consisting of shells of diatom microalgae. The main focus of this study was the functionalization of diatomite-based micro-arc coatings by incorporating the particles of titania (TiO2) into them. Various properties of the resulting coatings were examined and evaluated. The XRD analysis has revealed the formation of a new magnesium orthosilicate phase – forsterite (Mg2SiO4). It has been established that the corrosion current density of the coatings has decreased by 2-4 orders of magnitude after the inclusion of TiO2 particles, depending on the coating process voltage. The adhesion strength of the coatings has increased following the particle incorporation. The processes of dissolution of both coated and uncoated samples in a sodium chloride solution were studied. The in vitro cell viability was assessed, which showed that the coatings significantly reduce the cytotoxicity of Mg samples.

Keywords

Orthopedic implants; magnesium alloy; micro-arc coating; diatomite; TiO2; in vitro biocompatibility; corrosion resistance

Subject

Chemistry and Materials Science, Surfaces, Coatings and Films

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