Structure and electrical potential of calcium phosphate coatings modified with aluminum oxyhydroxide nanoparticles

Abstract

The effect of the introduction of charged aluminum oxyhydroxide (AO) nanoparticles into the porous coatings from calcium phosphate formed by micro-arc oxidation on their electrical potential and structure was studied. The modification resulted in changes in the morphology and elemental composition of the coatings. The selection of coating functionalization parameters resulted in obtaining homogeneously distributed aluminum oxyhydroxide nanoparticles in the form of agglomerates, providing the maximum change in the electrical potential of the coatings. An increase in the duration of ultrasonic dispersion (USD) of initial AlN powder suspension from 10 to 60 min and an increase in the surface roughness of the coatings, parameter R a , from 3.5 to 5.5 µm led to an increase in the surface electrical potential from −85 to −35 mV. At the same time, the aluminum content in the coating decreased from 3 to 1 at.% with an increase in the duration of USD of the AlN powder suspension from 10 to 60 minutes. The introduction of aluminum oxyhydroxide nanoparticles into the coating contributed to an improvement in corrosion properties, namely, an increase in the corrosion potential from 0.1 to 0.2 mV and a decrease in the corrosion current from 2.5 •10 −9 to 1.1•10 −9 A • cm 2 .

Antibacterial Calcium Phosphate Coatings with Zinc Oxide Nanoparticles

“…A stoichiometric hydroxyapatite, Ca 10 (PO 4 ) 6 (OH) 2 (ISSCM SB RAS, Novosibirsk, Russia), obtained as a powder via the method of mechanochemical synthesis, was used for the coating formation [34]. Powders of CaCO 3 and H 3 PO 4 water solution were used for the electrolyte production, as described in [9,12,17]. The "Microarc-3.0" installation developed at the Institute of Strength Physics and Materials Science SB RAS (ISPMS SB RAS, Tomsk, Russia) was used to carry out the MAO (PEO) process.…”

“…In most cases, titanium and titanium-based alloys are used for bone implants due to their mechanical properties, high strength, and biocompatibility [2,10,11]. Implant properties such as the surface topography, charge, corrosion resistance, and chemical composition are important for the successful ingrowth of material into bone tissue [12][13][14][15][16]. Rough and porous surfaces have a more pronounced and positive effect on cell activity compared to smooth surfaces [9,17,18].…”

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

“…These can include various pharmaceutical products, carbides, nitrides, oxides, etc. [35][36][37][38][39][40][41][42][43]. Altering the concentration and/or proportions of these particles makes it possible to control and tailor the structure and various properties of the resulting coatings.…”

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

“…These can include various pharmaceutical products, carbides, nitrides, oxides, etc. [39][40][41][42][43][44][45][46][47]. Altering the concentration and/or proportions of these particles makes it possible to control and tailor the structure and various properties of the resulting coatings.…”