COMPOSITES BASED ON CALCIUM PHOSPHATES AND COPPER NANOPARTICLES

Abstract

Copper nanoparticles were synthesized by the borohydride method using polymer stabilizers (polyethylene glycol, polyvinylpyrrolidone). It was found by optical spectroscopy that copper nanoparticles obtained at a molar ratio Cu/ polymer of 1:(3-6) have the highest stability (up to 1.5 months). It was shown that in the absence of polymer or at its low content (molar ratio Cu/ polymer 1:1), the resulting nanoparticles aggregate and a precipitate forms containing copper and its oxides (Cu2O, CuO). By mechanical mixing of amorphized calcium phosphates (in powder and gel form) and copper nanoparticles (in the form of a colloidal solution), a powder composite containing Ca19Cu2H2(PO4)14 and Cu2PO4OH phases was obtained. It was shown that during the co-precipitation of calcium phosphates and copper nanoparticles, copper ions are incorporated into the crystal lattice of calcium phosphates with the formation of mixed acidic and medium salts.

Keywords

• amorphized calcium phosphates
• hydroxyapatite
• copper nanoparticles
• polyvinylpyrrolidone
• polyethylene glycol
• composites