Wu Xinglong, Caol Minhua, Lü Hongyan, He Xiaoyan, Hu Changwen
Department of Chemistry, Northeast Normal University, Changchun, People's Republic of China.
J Nanosci Nanotechnol. 2006 Jul;6(7):2123-8. doi: 10.1166/jnn.2006.371.
The morphology- and size-controlled synthesis of MnCO3 nanocrystals was successfully achieved by cationic surfactant-CTAB-microemulsion-mediated solvothermal method. Various comparison experiments with different reactant concentrations and molar ratios between water and CTAB, showed the evolvement law of the morphology and size of the as-synthesized MnCO3 nanocrystals. With slowly increasing the concentration of reactants and/or molar ratio between water and CTAB, the morphology of MnCO3 nanocrystals changed gradually from cube to parallelepiped, and then rhombohedron, whereas the size decreased a little. The effect of the experimental parameters on the shapes and sizes of samples, such as the source of carbonate salts, reaction time, and temperature, were also discussed. X-ray powder diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), and high-resolution transmission electron microscopy (HRTEM) were used to characterize the products.
通过阳离子表面活性剂十六烷基三甲基溴化铵（CTAB）微乳液介导的溶剂热法成功实现了碳酸锰（MnCO₃）纳米晶体的形貌和尺寸可控合成。不同反应物浓度以及水与CTAB摩尔比的各种对比实验，揭示了合成的MnCO₃纳米晶体的形貌和尺寸演变规律。随着反应物浓度和/或水与CTAB摩尔比的缓慢增加，MnCO₃纳米晶体的形貌逐渐从立方体变为平行六面体，然后变为菱面体，而尺寸略有减小。还讨论了实验参数如碳酸盐盐源、反应时间和温度对样品形状和尺寸的影响。采用X射线粉末衍射（XRD）、透射电子显微镜（TEM）、选区电子衍射（SAED）和高分辨率透射电子显微镜（HRTEM）对产物进行表征。
