Fabrication of BaCO₃ sheaves tailored by carboxymethyl cellulose under compressed CO₂

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• 作者：Danping Shen ; Wei Li ; Shengjie Xu ; Peiyi Wu
• 关键词：A1. Biocrystallization ; A1. Crystal morphology ; A1. Nanoparticles self-assembly ; B1. Barium carbonate
• 刊名：Journal of Crystal Growth
• 出版年：2012
• 出版时间：15 August, 2012
• 年：2012
• 卷：353
• 期：1
• 页码：101-107
• 全文大小：1271 K

文摘

In this work, sheaf-like barium carbonate (BaCO₃) crystals were fabricated under the regulation of carboxymethyl cellulose (CMC) via a novel carbonation route with compressed CO₂. It was found that sheaves lied in the middle while the rods branched off at both ends of the sheaf. In addition, it was interesting to discover that the fine structures of the sheaf-like BaCO₃ crystals (such as the length, sheaf, rod diameter, open-angle, etc.) depended a lot on the concentration of added CMC. As revealed by molecular dynamic simulation, the morphological variations were due to the selective attachment of CMC chains onto (222) plane of witherite unit. The attached CMC chains would change the crystallization manner of BaCO₃ crystals and lead to the modulation of crystal morphology. And the growth of sheaf-like BaCO₃ crystals were believed to follow twinning and spherulitic growth route.