Preparation of needle-like aragonite particles from calcium nitrate solution
Department of Inorganic Technology, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovak Republic
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Abstract: Preparation of needle-like aragonite particles from calcium nitrate aqueous solutions was investigated in the temperature range 70 °C – 130 °C. Different additives recommended in literature as substances influencing morphology of aragonite crystals were tested. It was found that the studied system is so complex that all parameters (concentration of reagents, temperature, rate of mixing), not only the presence of surface active substances influence the process of nucleation and crystal growth. The highest yield of aragonite was obtained in the system H2O – Ca(NO3)2 – CO2 at 70 °C with no admixture of organic substances.
Keywords: aragonite, precipitated calcium carbonate, calcium nitrate
Full paper in Portable Document Format: acs_0086.pdf
Acta Chimica Slovaca, Vol. 4, No. 2, 2011, pp. 3—10