Greetings,
I am confused as to how can I create hydroxyapatite nanoparticles within the recommended Ca:P ratio? Please give me examples using Ca(OH) and Diammonium Hydrogen Phosphate/Orthophosphoric acid.
Regards:
BS Chemistry undergraduate.
The kinetics of HAp formation depend on the concentration of calcium, hydroxyl ions (namely, Ca/P ratio of reagents and pH) in precipitation medium. The bigger concentrations of the ions provide greater formation rate. Thermodynamic stability of stoichiometric HAp with Ca/P 1.67 favors its formation in solutions with pH => 9. If the formed HAp in fact has a Ca/P ratio close to 1.67, it will never decompose until 1200°C; in case of significant deviation from Ca/P 1.67, HAp is calcium-deficient and decomposes at 700-800°C yielding mixture of HAp/beta-TCP, when heated in air atmosphere.Article Calcium Phosphate Apatites: Wet Formation, Thermal Transform...
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