【作者】 周立群； 杨念华； 方光荣； 王驰伟； 袁良杰； 梁永光； 程锦国； 孙聚堂；

【Author】 ZHOU Li-qun, YAN Lian-hua, FANG Guang-rong, WANG Chi-wei, YUAN Liang-jie, LIANG Rong-guan, CHENG Jin-guo, SUN Ju-tang(College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China) (Faculty of Chemistry and Material Science, Hubei University, Wuhan 430062, China)

【机构】 武汉大学化学与分子科学学院； 湖北大学化学与材料科学学院；

【摘要】 以Ca(NO3)2·4H2O和Na2CO3·10H2O为主原料,采用室温固相反应首次合成出纳米CaCO3,平均粒径为19nm,BET比表面积为36.3m2·g-1。探讨了添加剂和洗涤剂Na5P3O10对CaCO3晶体的生长和粒径的控制机理。结果表明:Na5P3O10能有效地抑制CaCO3晶体的生长和团聚。其作用在于Na5P3O10电离产生的离子可进入CaCO3晶格位置或选择性地吸附在CaCO3的晶面上,从而降低了CaCO3的表面能。当CaCO3的活性部位被完全包覆时,继续增加Na5P3O10用量,将不再抑制CaCO3的生长。更多还原

【Abstract】 CaCO3 nano-powders were first prepared by the solid state reaction of Ca(NO3)2·4H2O with Na2CO3·10H2O and additive Na5P3O10 at room temperature. The results show that the nano-powders have the mean grain size of 19nm and BET specific surface area of 36.3m2·g-1, the Na5P3O10 could effectively prohibit CaCO3 crystal growth and aggregate. This paper discussed the growth characteristics and controlling mechanism of CaCO3 nanocrystals from additive and cleaning compound Na5P3O10. The ions produced due to the electroionization of the Na5P3O10 can occupy the CaCO3 lattice-sites, or be absorbed on CaCO3 crystal faces, therefore changing the CaCO3 crystal surface energy. When the additive or cleaning amount is large enough to cover active sites on crystal faces, the increasing of additive or cleaning concentration can not further inhabit crystal growth.更多还原