Control of particle morphology of calcium-phosphate microsphere by salt-assisted ultrasonic spray-pyrolysis technique

Abstract

We have prepared hollow calcium-phosphate microsphere by salt-assisted ultrasonic spray-pyrolysis technique, and aimed to control the particle morphology by changing i) concentration of added salt (NaCl) in starting solution (Ca/P ratio=1.50) and ii) pyrolysis temperature. In case of pyrolysis temperature of 850 ºC and concentration of NaCl in the range of 0.60-1.50 mol·dm–3, we observed formation of secondary particles consisting of rod-like primary particles. Thus, morphology of microsphere can be controlled by changing concentration of NaCl in starting solution and pyrolysis temperature.