反相微乳液介质中纳米Sm2O3的制备

Preparation of Sm_2O_3 Nanoparticles in the Media of Reverse Microemulsions

用十六烷基三甲基溴化铵(CTAB)/正丁醇/正辛烷/钐盐水溶液(氨水)所形成的反相微乳液体系,控制合成Sm2O3球形纳米粒子.绘制出25℃下CTAB/正丁醇/正辛烷/钐盐水溶液(氨水)体系的拟三元相图,得到了反相微乳液区.在此反相微乳区内合成了Sm2O3的前驱体,对前驱体进行热分析(TG-DSC),确定了得到纳米Sm2O3产物的适宜焙烧温度为900℃,并考察了微乳液中反应物浓度、反应时间等因素对合成产物的影响.采用X射线衍射(XRD)、透射电镜(TEM)、激光粒度仪(NSA)、荧光光谱(FS)仪等分析方法对Sm2O3产物的形貌、晶形、粒径及荧光性质进行了表征.结果表明,25℃下利用反相微乳液法,成功地制备了粒径分布较窄、分散性良好的球形纳米Sm2O3粒子,粒径约20nm左右,且表现出较强的荧光性质.

Abstract： Sm2O3 nanoparticles were prepared in W/O reverse microemulsion composed of cetyltfimethylammonium bromide （CTAB）, n-butanol, n-octane, Sm（NO3）3 brine, and ammonia water. Based on the pseudo-ternary phase diagrams of the microemulsions at 25 ℃, a microemulsion region for preparation of Sm2O3 was determined, and the precursor products of Sm2O3 nanoparticles were synthesized in the microemulsion region. The influences of the reactant concentration and the reaction time on the size of the precursors were studied. The result derived from thermal analysis （TG-DSC） indicated that the proper calcination temperature was 900 ℃. The structures and morphologies of the nanoparticles were characterized by X-ray powder diffraction （XRD）, transmission electron microscope （TEM）, nanoparticle size analyzer （NSA）, and fluorescence spectroscope （FS）, respectively. The results showed that the Sm2O3 fluorescent nanoparticles with narrow distribution in size could be obtained by using this method.