文献类型：期刊文献

中文题名：NaHCO_3对纳米碳酸钙粉末形貌的修饰作用

英文题名：NaHCO_3 Modification of Morphology of Nanosized Calcium Carbonate Powder

作者：成居正[1];陈雪梅[1];邓捷[1]

机构：[1]华东理工大学超细粉末国家工程研究中心,上海200237

年份：2013

卷号：31

期号：3

起止页码：404

中文期刊名：材料科学与工程学报

外文期刊名：Journal of Materials Science and Engineering

收录：CSTPCD;;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；

语种：中文

中文关键词：纳米碳酸钙;碳酸氢钠;陈化;形貌规整

外文关键词：nanometer calcium carbonate; NaHCO3 ; aging regular morphology

摘要：采用碳化-陈化法制备形貌规整、粒径分布窄、分散性好的立方形纳米碳酸钙,研究了影响碳酸钙颗粒形貌的主要工艺因素,探讨了陈化过程中体系发生的物理化学变化及晶形修饰剂的作用机理。采用TEM、XRD等对样品微观结构进行表征。结果表明,陈化过程中加入NaHCO3促使线性中间体中的氢氧化钙转变为碳酸钙,进而发生线性中间体断裂,Ostwald熟化及颗粒表面重排。在NaHCO3添加量为0～4%时,颗粒粒径随添加量的增加而增大;在陈化温度为55～65℃时,陈化进程随陈化温度的升高而加快,但温度超过70℃,碳酸钙形貌发生立方形向片状的转变。
Nanosized calcium carbonate powder with regular cubic morphology, high dispersion and narrow particle size distribution （100- ll0nm） was prepared. Factors affecting the morphology was first studied. Physical and chemical changes and mechanism of the crystal shape formation during the aging process were then analyzed. Morphologies and phase structures of the as-prepared CaCO3 nanoparticles were observed in detail by TtM and XRD. Results show that calcium carbonate precipitation out of the linear intermediates, intermediates separation, Ostwald ripening, crystal surface rearrangement subsequently take place in the system during aging wilh NaHCOa addition. Particle size increase with the increase in NaHCO3 addition till 4% ; Aging process can be accelerated with temperature increase from 55 to 65℃ ; However, when temperature is above 70℃, calcium carbonate morphology changes from cube into flake.