Best operating conditions to produce hydroxyapatite nanoparticles by means of a spinning disc reactor

In this work, Mg2＋ doped hydroxyapatite （Mg-HAP） nanoparticles were produced by a reactionprecipitation process by using a spinning disc reactor （SDR） at high rotational speed. The production process of these nanoparticles consisted of the neutralization reaction between two aqueous solutions of calcium chloride and ammonia orthophosphate at room temperature. By operating at pH = 10, a high purity Mg-HAP nanoparticles were obtained. In particular, they were 51 nm in average size when the two reagents were fed over the disc symmetrically at 3 cm from the disc center and a rotational speed of the disc reactor equal to 1400 r/min was adopted.