摘要
利用固态置换反应,在机械化学条件下制备碳酸钙,即把氯化钙和碳酸钠混合,在常温下机械球磨,然后把粉末混合物加热至350℃保温1 h,使反应完全,最后通过洗涤去除副产品,即得到方解石型纳米碳酸钙。在反应过程中,通过X线衍射对不同反应时间粉末混合物进行分析,利用扫描电镜(SEM)对碳酸钙粉末进行表征,并采用AR2000流变仪对CaCO3-PEG分散体系的流变性进行测定。研究结果表明,机械化学法能够制备单一形貌的纳米级碳酸钙粉末;CaCO3-PEG分散体系具有剪切增稠现象,而且CaCO3体积分数越高越明显。
A solid-state displacement reaction was induced to synthesize calcium carbonate during mechanochemical processing.Calcium chloride and sodium carbonate were mixed together and milled at room temperature,and then the as-milled powder was heat-treated at 350 ℃ for 1 h.The calcite nanoparticles were gained by removing the by-product through a simple washing process.The mixture was analyzed by X-ray diffractrometry（XRD） at different reaction time,the calcium carbonate powder was characterized by scanning electron microscope（SEM） and the rheological property of CaCO3-PEG suspension was investigated by AR2000 stress controlled rheometer.The results show that single crystal calcium carbonate nanoparticles can be prepared by mechanochemical processing,and the CaCO3-PEG suspension has shear-thickening behavior when it is sheared.It is illustrated that the higher volume fraction of CaCO3,the more obvious the phenomenon.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第8期2274-2277,共4页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(50774096
50604017)
中南大学中央高校基金科研业务费专项资金资助项目(2011QNT046)
关键词
机械化学
碳酸钙
流变性
剪切增稠
mechanochemical
calcium carbonate
rheological property
shear-thickening
