One and two-step electrodeposition of composite films of calcium-deficient hydroxyapatite matrix with nanoscale Ag- and Zn-based particles
Escobar, Michael (Universitat Autònoma de Barcelona. Departament de Física)
Hoffmann, Volker (Leibniz Institute for Solid State and Materials Research)
Gemming, Thomas (Leibniz Institute for Solid State and Materials Research)
Kim, Minsoo (ETH Zürich. Institute of Robotics and Intelligent Systems)
Pané i Vidal, Salvador (ETH Zürich. Institute of Robotics and Intelligent Systems)
Sort Viñas, Jordi (Universitat Autònoma de Barcelona. Departament de Física)
Pellicer Vilà, Eva Maria (Universitat Autònoma de Barcelona. Departament de Física)

Fecha:	2024
Resumen:	A fundamental study regarding the electrochemical synthesis of composite coatings with application in the orthopaedic field has been conducted. In particular, the electrodeposition of calcium phosphate coatings with Ag nanoparticles (AgNPs) from either a single electrolyte (one-step, 1S) or two electrolytes (two-step, 2S) on a β-Ti alloy (Ti-18Mo-6Nb-4Ta in wt%) was investigated. Pulse current deposition was implemented to produce the composite coatings by the 1S approach from a simple solution containing 42 mM Ca(NO3)2·4H2O, 25 mM NH4H2PO4, and 0. 5 mM AgNO3 at 65°C. Meanwhile, the calcium phosphate matrix was also deposited by pulse current, and Ag was afterwards grown by direct current from 0. 1 M KNO3 + x mM AgNO3 (x = 5, 10) at 25 °C (2S approach). The Ca/P ratio of the matrix was compatible with the formation of calcium-deficient hydroxyapatite (CDHA). The resulting Ag content in the composites could be varied between 4 and 13 wt% as a function of the working conditions. The 2S-derived coatings produced by electroplating Ag at j = -20. 8 mA/cm2 from 0. 1 M KNO3 + 10 mM AgNO3 furnished an optimal dispersion of the AgNPs on top of the CDHA matrix, while aggregation and/or dendritic growth was observed in other cases. Glow discharge optical emission spectrometry (GDOES) measurements indicated that a given amount of AgNPs becomes engulfed in the CDHA matrix during the 1S electrodeposition, whereas most of them decorate its outer surface in the 2S-derived coatings. The applicability of the two approaches was extended to the case of zinc oxide. ZnO-containing CDHA coatings in which the Zn element was homogeneously distributed across the film surface were obtained from 42 mM Ca(NO3)2·4H2O, 25 mM NH4H2PO4 and 1 mM Zn(NO3)2·6H2O at 65 °C (1S approach). On the contrary, ZnO-NPs could be clearly observed when deposition from 5 mM KNO3 + 5 mM Zn(NO3)2 was performed at 70 °C on top of previously grown CDHA (2S approach). The results indicated that the percentage and location of the antibacterial element (Ag, Zn) in the calcium phosphate matrix can be tuned on demand to a great extent by electrochemical means.
Ayudas:	European Commission 861046 Agència de Gestió d'Ajuts Universitaris i de Recerca 2021/SGR-00651 Agencia Estatal de Investigación PID2020-116844RB-C21
Nota:	Altres ajuts: acords transformatius de la UAB
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Surface modification ; Electrodeposition ; Composite coatings ; Hydroxyapatite ; Metallic nanoparticles ; Characterization
Publicado en:	Surfaces and Interfaces, Vol. 44 (January 2024) , art. 103671, ISSN 2468-0230

DOI: 10.1016/j.surfin.2023.103671

10 p, 7.7 MB

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