Microwave assistant synthesis of calcium phosphate minerals using hen's eggshells as a calcium source

In this study raw hen's eggshells were used as a calcium source for calcium phosphate mineral synthesis. The materials composed of brushite and different amounts of HA ( hydroxyapatite) and beta-TCP (beta-tricalcium phosphate) with the needle-like, sheet-like and hexagonal structures were synthesized in the presence of the microwave. It was found that the time of microwave action, temperature and initial pH are parameters affecting the morphology and composition of the obtained materials, i.e. the increasing duration of MW exposure increases the amount of HA increases, whereas the temperature increase causes an increase in the contents of brushite and beta-TCP. The lowering of initial pH leads to an increase in the brushite content.