Synthesis of novel amorphous calcium carbonate by sono atomization for reactive mixing |
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Authors: | Kojima Yoshiyuki Kanai Makoto Nishimiya Nobuyuki |
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Institution: | Department of Materials and Applied Chemistry, Faculty of Science and Technology, Nihon University, Tokyo 101-8308, Japan |
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Abstract: | Droplets of several micrometers in size can be formed in aqueous solution by atomization under ultrasonic irradiation at 2 MHz. This phenomenon, known as atomization, is capable of forming fine droplets for use as a reaction field. This synthetic method is called SARM (sono atomization for reactive mixing). This paper reports on the synthesis of a novel amorphous calcium carbonate formed by SARM. The amorphous calcium carbonate, obtained at a solution concentration of 0.8 mol/dm3, had a specific surface area of 65 m2/g and a composition of CaCO3•0.5H2O as determined using thermogravimetric/differential thermal analysis (TG-DTA). Because the ACC had a lower hydrate composition than conventional amorphous calcium carbonate (ACC), the ACC synthesized in this paper was very stable at room temperature. |
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Keywords: | Amorphous calcium carbonate Sono atomization Synthesis Composition High specific surface area |
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