title: Synthesis of novel amorphous calcium carbonate by sono atomization for reactive mixing.
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.
authors.affiliation: Department of Materials and Applied Chemistry, Faculty of Science and Technology, Nihon University, Tokyo 101-8308, Japan. ykojima@chem.cst.nihon-u.ac.jp
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Kojima
authors.forename: Makoto
authors.initials: M
authors.lastname: Kanai
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Nishimiya