反相微乳液介质中Nd2(CO3)3·8H2 O的可控合成

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.

Controlled Synthesis of Nd2( CO3 ) 3 ·8H2O Particles in the Media of Reverse Microemulsions

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.