Calcite particles formation, in the presence of soluble polyvinyl-alcohol matrix

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• 作者：P. Malkaj ; E. Dalas ; D.G. Kanellopoulou ; A. Chrissanthopoulos ; D. Sevastos
• 关键词：Calcium carbonate ; Calcite ; Polyvinyl-alcohol ; Crystallization
• 刊名：Powder Technology
• 出版年：2007
• 出版时间：15 August 2007
• 年：2007
• 卷：177
• 期：2
• 页码：71-76
• 全文大小：677 K

文摘

The kinetics of calcite particles formation in the presence of soluble polyvinyl-alcohol matrix was investigated by the constant composition method. The presence of the above-mentioned polymer, induces the precipitation of this calcium carbonate polymorph at room temperature possibly through the –OH moieties. The apparent order for the crystallization process was found to be 2.25 ± 0.16 indicative of a surface nucleation mechanism. The number of ions forming the 3D critical nucleus was found to be p = 9. The surface energy of the growing phase was 28 mJ m^{− 2} relatively small because of imperfections, in the form of vacant sites.