Synthesis and physicochemical investigation of calcium silicate hydrate with different stoichiometric composition

Abstract

Calcium silicates are considered as promising components of materials for hard tissue repair. The main attention is paid to the crystalline forms of these substances. In the present study, a series of amorphous calcium silicate hydrates with molar coefficient Ca/Si = 0.65 - 1.45 was prepared by precipitation in aqueous solutions. The samples were analysed using X-ray diffraction, FT-IR spectroscopy, SEM, TGA, BET. The dynamics of calcium silicate hydrates dissolution in Tris-buffer solution with pH = 7.40, corresponding to the acidity of human plasma, was compared with wollastonite and apatite. It is shown that calcium silicate hydrates actively dissolve in a slightly alkaline medium, ensuring the appearance of calcium ions in the solution in amounts that exceed the cation concentrations in systems with β-CaSiO3Ca10(PO4)6(OH)2.