| Home | Log-in | Admin | Sitemap |
Home | Program | Detailed Program
Detailed Program
Paper Number : NA-O01
Time Frame : 11:35~11:47
Presentation Date : Friday, 28, November
Session Name : Nano-particles & Nano-structured Materials
Session Chair 1# : Chang-Yeoul Kim
Session Chair 2# : Yamamoto Hayashi
The New Methodologies for the Synthesis of Nano Precipitated Calcium Carbonates
CHILAKALA. Ramakrishna
Korea Institute of Geoscience and Mineral Resources(KIGAM)
Keywords: New Methods, Nano PCC, Applications

Recently the interest for aragonite, the calcium carbonate polymorph is increasing because new fields, like biomaterials, tissue engineering, paper making are developing. We investigated the possibility of synthesis of nano aragonite type precipitated calcium carbonate with uniform particle size by novel carbonation method and solution process. Some recent studies report synthesis of nano aragonite precipitated calcium carbonate is possible with the double jet methods in presence of organic additives [1,2]. The controlled double-jet precipitation method allows the production of colloidal particles with a good control of their monodispersity [3].
The carbonation process can be proceeded by solid – liquid – gas, solid Ca(OH)2 is added to the MgCl2 solution and gaseous CO2 is injected to the suspension of MgCl2- Ca(OH)2 solution. The solution process is followed by liquid-liquid reaction using double-jet precipitation method using at the fixed temperature of 50¨¬C, with a flow rate of 1 ml/min.
We reported in this paper, the aspect ratio of aragonite-type PCC was controlled by the reaction temperature and CO2 (g) flow rate. From the both processes, nano aragonite was obtained with average particle size is from 10~40 nm.

References:
1. C. D. Mateescu, R. Isopescu, F. Branzoi, M. Mihai and I. Chilibon, J. Optoelectr. Adv. Mat. 10 (2008) 2667.
2. Irinela Chilibon, 17th International Congress on Sound and Vibration (ICSV17), Cairo, Egypt, 18-22 July( 2010)
3. G. Xu, N.Yao, I.A. Aksay and J.T. Groves, J. Am. Chem. Soc. 120 (1998) 11977.
Acknowledgements : The authors were highly thankful to Korea Institute of Energy Technology Evaluation and Planning through ETI program (Project No. 2010201010093C) for their financial supporting to this research work.