在聚丙烯酰胺(PAM)溶液中, 通过单一聚合物调控CaCO3晶体生长, 制备了核/壳结构的花生状CaCO3粒子. 采用扫描电子显微镜(SEM)、透射电子显微镜(TEM)及X射线粉末衍射(XRD)对合成样品的形貌、结构进行了表征. 结果显示, 花生状CaCO3粒子的外壳由菱形的方解石组成, 核由小粒子组成的短棒状粒子串组成, 并形成由里向外的放射性状结构, 核中间还具有较大体积的空腔. 利用分形生长机理解释了粒子放射性结构的形成, 并利用奥斯特瓦尔德熟化理论解释了核/壳结构的形成.
Peanut-like CaCO3 assemblies with core-shell structure were obtained in polyacrylamide aqueous solution. The as-prepared products were characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD). The results indicate that the peanut-like CaCO3 assemblies has some hollows. The shell of the CaCO3 assemblies is composed of calcite rhombohedras, and the core of the CaCO3 assemblies is composed of rod-like aggregates which are assembled by small particles and the core has a radially outward growth structure. The radially outward structure of the core is explained by the fractal growth theory, and the formation of Core/Shell structure is explained by the Ostwald ripening theory.
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