Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Synthesis of Amorphous Calcium Carbonation in Ethanol and its Crystallization in the Aqeous Solution
Amorphous calcium carbonate (ACC) was synthesized by reaction to the Ca(OH)2-C2H5OH-CH2OHCH2OH-CO2 systems. The ACC was then crystallized in aqueous solutions while observing the changes in crystal phases. Using lL/min of CO2 flow rate, 600rpm of stirring rate and various concentrations of Ca(OH)2 as the conditions, the reaction was divided into three stages according to changes of electrical conductivity that depends on Ca2+ concentration. ACC synthesized by these reactions was stabilized to calcite through vaterite according to time. When crystallizing the ACC in an aqueous solution, it was transferred to calcite by means of a low stirring speed regardless of temperature. However, a small amount of aragonite was obtained with higher stirring rate at high temperatures. Furthermore, the addition of NH4 + ions resulted in an irregular shape and size of the produced calcite, while Mg2+ ions enhanced aragonite production.
Synthesis of Amorphous Calcium Carbonation in Ethanol and its Crystallization in the Aqeous Solution
Amorphous calcium carbonate (ACC) was synthesized by reaction to the Ca(OH)2-C2H5OH-CH2OHCH2OH-CO2 systems. The ACC was then crystallized in aqueous solutions while observing the changes in crystal phases. Using lL/min of CO2 flow rate, 600rpm of stirring rate and various concentrations of Ca(OH)2 as the conditions, the reaction was divided into three stages according to changes of electrical conductivity that depends on Ca2+ concentration. ACC synthesized by these reactions was stabilized to calcite through vaterite according to time. When crystallizing the ACC in an aqueous solution, it was transferred to calcite by means of a low stirring speed regardless of temperature. However, a small amount of aragonite was obtained with higher stirring rate at high temperatures. Furthermore, the addition of NH4 + ions resulted in an irregular shape and size of the produced calcite, while Mg2+ ions enhanced aragonite production.
Synthesis of Amorphous Calcium Carbonation in Ethanol and its Crystallization in the Aqeous Solution
Ahn, Ji-Whan (Autor:in) / Park, Jin-Koo (Autor:in) / Lee, Sang-Bop (Autor:in) / Cho, Hee-Chan (Autor:in) / Han, Choon (Autor:in) / Kim, Hwan (Autor:in)
Geosystem Engineering ; 6 ; 106-111
01.12.2003
6 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
ACC , carbonation process , calcite , aragonite , vaterite
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