Kryzhanovska O. Growth of polycrystalline calcium-phosphate coatings on titanium and sapphire surfaces

Object of investigation - process of crystallization of calcium phosphates on bioinert surfaces of titanium and sapphire. Aim of investigation is to determine the mechanisms of phase formation of polycrystalline calcium-phosphate coatings in CaCl2-KH2PO4-HCl-NaOH-H2O system at high supersaturation values, quantitative determination of the effect of substrate modification on growth kinetics and morphology of calcium hydroxyapatite and octacalcium phosphate coatings. Methods of investigation: X-ray diffraction, X-ray photoemission spectroscopy, transmission and scanning electron microscopy, gravimetry. Theoretical and practical results, novelty: Conditions of directed crystallization of calcium-phosphate coatings from aqueous solutions on the modified titanium and sapphire substrates are determined and optimized. The initial stages of formation and growth kinetics of calcium-phosphate coatings on the substrates are studied. The effect of growth conditions on the phase composition and structural properties of calcium phosphate coatings is studied. Modifying layers provided effective nucleation of calcium phosphates on inert sapphire surface are developed. Application fields: development and fabrication of biomaterials, biocompatible coatings.