P6 高周波超音波照射によるグリシン結晶の成長促進 : 微結晶組み込み機構の検討(Poster Session)

概要

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Antisolvent crystallization of glycine was performed under ultrasonic irradiation of 1.6 MHz. The irradiation enhanced the transition from β to α-form, the growth of α-glycine and the uniformity in crystal size. The enhancement effects depended on the ultrasonic power. It was experimentally proved that ultrasonic irradiation enhanced the incorporation of microcrystals into larger crystals. The crystal growth was successfully modeled by regarding the incorporation as the pseudo-first order reaction. The rate constant varied with the ultrasonic power. There was a threshold power for the rate constants, and the rate constant linearly increased with the ultrasonic power above the threshold. The threshold power corresponded to that for KI oxidation in water, which implies a close relation between cavitation and incorporation of microcrystals.
2012-11-09