反相微乳液介质中Nd_2(CO_3)·_38H_2O的可控合成  

Controlled Synthesis of Nd_2(CO_3)_3·8H_2O Particles in the Media of Reverse Microemulsions

作　　者：朱文庆[1] 邢西萍[1] 张超[1] 袁煜昆[1] 陈亚芍[2] 

机构地区：[1]西安工程大学环境与化学工程学院,西安710048 [2]陕西师范大学应用表面与胶体化学教育部重点实验室,化学与材料科学学院,西安710062

出　　处：《高等学校化学学报》2012年第5期1036-1040,共5页Chemical Journal of Chinese Universities

基　　金：陕西省科技攻关项目(批准号:2011K07-23);陕西省教育厅专项科研计划项目(批准号:11JK0566);应用表面与胶体化学教育部重点实验室开放基金(批准号:201003);西安工程大学博士基金(批准号:BS1010)资助

摘　　要：以十六烷基三甲基溴化铵(CTAB)/正丁醇/正辛烷/硝酸钕[Nd(NO3)3]溶液(碳酸钠溶液)所组成的反相微乳液为反应介质,采用微乳液溶剂热法合成了Nd2(CO3)3·8H2O,并考察了水/核比([H2O]/[CTAB])和Nd(NO3)3的浓度对其形貌和尺寸的影响.利用X射线衍射(XRD)、热分析(DSC-TGA)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)等对Nd2(CO3)3.8H2O的晶型、形貌及尺寸进行了表征,并提出了不同形貌Nd2(CO3)3·8H2O形成的可能机理.结果表明,随着水/核比的增大,Nd2(CO3)3.8H2O的形貌从多面体变成鱼尾状,再变成针状;随着Nd(NO3)3浓度的增大,针状Nd2(CO3)3.8H2O的尺寸逐渐减小.Nd 2（CO 3） 3·8H 2O particles were prepared in water/oil（W/O） reverse microemulsion composed of cetyltrimethylammonium bromide（CTAB）,n-butanol,n-octane,Nd（NO 3） 3·6H 2O aqueous solution,Na 2CO 3 aqueous solution by the microemulsion-assisted solvothermal method.The influences of the molar ratio of water to CTAB and the concentration of Nd（NO 3） 3 on the morphologies and sizes of Nd 2（CO 3） 3·8H 2O particles were studied.The structures,morphologies and sizes of the nanoparticles were characterized by X-ray powder diffraction（XRD）,differential scanning calorimetry and thermal gravimetric analysis（DSC-TGA）,scanning electron microscope（SEM） and transmission electron microscope（TEM）.The possible formation mechanism of the morphologies structure of Nd 2（CO 3） 3·8H 2O was proposed.The Nd 2（CO 3） 3 particles with polyhedral,fishtail-like and needle-like shapes were controlledly synthesized via the microemulsion-assisted solvothermal method by regulating the molar ratio of water to CTAB.The size of the needle-like Nd 2（CO 3） 3·8H 2O particles decreased with increase of the concentration of Nd（NO 3） 3.

关 键 词：反相微乳液 微乳液溶剂热法 Nd2(CO3)3·8H2O 可控合成 

分 类 号：O648[理学—物理化学]