超音波照射によるEDTA溶液中におけるカルシウム塩結晶の化学的穿孔

概要

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Local chemical dissolution, i. e. chemical lithotresis, of calcium salt crystal (gypsum) in EDTA solution was made by irradiating the ultrasonic wave locally on the surface of gypsum. The dissolution, however, was hindered by the macrobubbles (0. 1 mm order in diameter) on the surface of gypsum. It seems that the macrobubbles contained in the solution and crystal have grown up into the macrobubbles on the surface of gypsum by irradiating the ultrasonic wave. These macrobubbles gathered to the surface of solution when the ultrasonic irradiation stopped, so that the intermittent ultrasonic wave was used in this study. It takes about 0. 5s in order to remove the macrobubbles almost completely from the surface of gypsum. The rate of the chemical lithotresis is proportional to the power of ultrasonic wave under this experimental condition unless the macrobubbles exist on the surface of gypsum.
社団法人日本音響学会の論文