Open AccessStudy of thermal effects of silicate-containing hydroxyapatites
Author(s) -
О. А. Голованова,
А В Зайц,
N V Berdinskaya,
T S Mylnikova
Publication year - 2016
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/110/1/012024
Subject(s) - silicate , crystallization , hydroxyapatites , silicon , materials science , calcium silicate , chemical engineering , phosphate , thermal stability , nanocrystalline material , impurity , thermal treatment , fourier transform infrared spectroscopy , sodium silicate , mineralogy , inorganic chemistry , chemistry , calcium , nanotechnology , organic chemistry , metallurgy , engineering , composite material
The possibility of modifications of hydroxyapatite silicate ions, from the extracellular fluid prototype solution under near-physiological conditions has been studied. Formation of silicon-structured hydroxyapatite with different extent of substitution of phosphate groups in the silicate group has been established through chemical and X-ray diffraction analyses, FTIR spectroscopy and optical microscopy. The results obtained are in agreement and suggest the possibility of substitution of phosphate groups for silicate groups in the hydroxyapatite structure when introducing different sources of silica, tetraethoxysilane and sodium silicate, in the reaction mixture. Growth in the amount of silicon in Si-HA results in the increase in the thermal stability of the samples. The greatest mass loss occurs at temperatures in the range of 25-400 °С that is caused by the removal of the crystallization and adsorption water and volatile impurities. It is shown that the modified apatites are of imperfect structure and crystallize in a nanocrystalline state