Synthesis of the Nanoscale Calcium Hydroxyapatite from Calcium Malate and Ammonium Hydrophosphate

Abstract

Abstract—A new method for obtaining the nanoscale hydroxyapatite with low crystallinity from aqueous solution of calcium malate Ca(C₄H₅O₅)₂ and ammonium hydrophosphate (NH₄)₂HPO₄ at room temperature, molar ratio Ca/P = 1.67, and pH 9 was proposed. After synthesis and drying, the sample was a transparent composite with a matrix from the by-product of the reaction of organic nature containing nanoscale particles of calcium phosphate. The phase composition of the sample after thermal treatment at 900°C was represented by calcium hydroxyapatite.