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Updated: May 30, 2026

Calcium Carbonate Formation in the Presence of Biopolymeric Additives
Published on: May 14, 2019
Synthesis of novel amorphous calcium carbonate by sono atomization for reactive mixing
Yoshiyuki Kojima1, Makoto Kanai, Nobuyuki Nishimiya
1Department of Materials and Applied Chemistry, Faculty of Science and Technology, Nihon University, Tokyo 101-8308, Japan. ykojima@chem.cst.nihon-u.ac.jp
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/dm(3), had a specific surface area of 65 m(2)/g and a composition of CaCO(3)•0.5H(2)O 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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