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Influence of Different Surfactants on Morphology of Single Crystal Ce2O(CO3)2·H2O and Formation Mechanism
Yan Mei,Ye-bin Han,Zuo-ren Nie*
Author NameAffiliationE-mail
Yan Mei College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China  
Ye-bin Han College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China  
Zuo-ren Nie* College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China zrnie@bjut.edu.cnTel/Fax:010-67396206,010-67391536 
Abstract:
Three kinds of ultra-fine Ce2O(CO3)2.H2O powders with different morphologies were prepared by adding CTAB, PEG19000 and OP-10 to a solution of Ce2O (NO3)3.6H2O and urea according to the principle and the characteristics of the homogeneous precipitation method. The products were characterized by TEM and XRD. The results showed that the precursor was a single crystal, and that different surfactants had different influences on the morphology of the products. The cationic surfactant CTAB had little effect on crystal morphology merely reducing its size. Nonionic surfactants PEG19000 and OP-10 are both able to change the crystal morphology to a much greater extent. Adding PEG19000 produces an array of rod-like particles with ordered formation and uniform dimension. Meanwhile, in the system of OP-10, a sort of flower-like with different morphologies occured because of the mechanism of formation and grain growth.
Key words:  Surfactant, Homogeneous precipitation, Single crystal, Morphology, Mechanism
FundProject:
表面活性剂对均相沉淀法制备单晶Ce2O(CO3)2¢H2O微粉形貌及 形成机理的影响
梅燕,韩业斌,聂祚仁*
摘要:
在尿素及硝酸铈的混合溶液中分别加入表面活性剂CTAB、PEG19000、OP-10,利用均相沉淀法合成了不同形貌的CeO2超细前驱体Ce2O(CO3)2¢H2O,采用X射线衍射及透射电子显微镜等测试手段,对产品的物相和形貌进行了表征.实验结果表明,所得产品均为斜方晶系的单晶Ce2O(CO3)2¢H2O,且表面活性剂的加入使晶体的晶化程度明显提高;添加不同的表面活性剂得到不同形貌尺寸的产物:阳离子型表面活性剂CTAB对Ce2O(CO3)2¢H2O晶体的形貌影响不大,所得产物尺寸变小,且分散性得到一定的改善;
关键词:  表面活性剂, 均相沉淀法, 单晶, 形貌, 机理
DOI:10.1360/cjcp2006.19(3).269.4
分类号: