摘要
晶体的晶型和形貌是碳酸钙制备中的关键问题之一。采用尿素水解均匀沉淀法来控制碳酸钙的晶型和形貌。利用XRD和SEM等技术手段对Ca CO3晶体的结构和形貌进行了表征。结果表明,高温条件下(90℃)水溶液中得到均匀的针状结构的文石晶体。添加适量柠檬酸钠后,则得到的是特殊形貌的方解石晶体。在乙醇/水混合溶剂中,柠檬酸钠对Ca CO3晶体的形貌也有重要影响,通过改变乙醇体积分数,得到了中空绒毛球状的球霰石。
Calcium carbonate with various polymorphs and morphologies was prepared by urea hydrolytic method in this study. The crystals were characterized by powder X-ray diffraction （XRD） and scanning electron microscopy（SEM） analysis. Uniform needle-like aragonite crystals are obtained in aqueous solution at 90 ℃. In contrast, the addition of sodium citrate results in the formation of novel morphologies of calcite crystals. We also studied the growth of calcium carbonate in the mixed solvent of ethanol/water with sodium citrate as control agent. The results show that sodium citrate also has significant influence on polymorphs and morphologies of calcium carbonate in the ethanol/water mixed solution. Hollow spherical vaterite crystals are obtained in the presence of sodium citrate by changing the volume fraction of ethanol.
出处
《应用化学》
CAS
CSCD
北大核心
2015年第7期831-836,共6页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金资助项目(20873136)~~
关键词
碳酸钙
晶型
柠檬酸钠
乙醇/水混合溶剂
尿素
calcium carbonate
polymorphs
sodium citrate
ethanol/water mixed solutions
urea
作者简介
通讯联系人：王海水，教授；Tel：020-22236516；E-mail：wanghsh@scut．edu．cn；研究方向：晶体生长控制研究
