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Continuous-flow precipitation of hydroxyapatite in ultrasonic microsystems
Castro, Filipa; Kuhn, Simon; Jensen, Klavs; Ferreira, António; Rocha, Fernando; Vicente, A. A.; Teixeira, J. A.This paper describes the continuous-flow precipitation of hydroxyapatite Ca5(PO4)3OH (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. The single-phase flow study was then c...
Process intensification and optimization for hydroxyapatite nanoparticles produ...
Castro, Filipa; Kuhn, Simon; Jensen, Klavs; Ferreira, António; Rocha, F.; Vicente, A. A.; Teixeira, J. A.Precipitation processes are widely used in industry for the production of particulate solids. Efficient mixing of the reagents is of major importance for the chemical and physical nature of the synthesized particles. Recently, microreactors have been studied to overcome homogeneity problems found when using stirred tank batch reactors. The present work investigated an ultrasonic tubular microreactor for the con...
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