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This paper describes the continuous-flow precipitation of hydroxyapatite Ca 5 (PO 4 ) 3 OH (HAp) in two ultrasonic microreactors using diluted aqueous solutions of calcium and phosphate at 37°C. Precipitation of HAp was first carried out in a tubular microreactor immersed in an ultrasonic bath, where single-phase (laminar) flow and segmented gas–liquid flow were both evaluated...
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