无机材料学报

• 研究论文 • 上一篇    下一篇

PAM溶液中合成核/壳结构花生状碳酸钙粒子

蒋锡华, 郑明波, 陈惠钦, 潘力佳, 陶杰, 曹洁明   

  1. 南京航空航天大学材料科学与技术学院纳米材料研究所, 南京 210016
  • 收稿日期:2008-03-10 修回日期:2008-05-03 出版日期:2008-11-20 网络出版日期:2008-11-20

Synthesis of Core/Shell Calcium Carbonate Peanut-like Assemblies in Polyacrylamide Aqueous Solution

JIANG Xi-Hua, ZHENG Ming-Bo, CHEN Hui-Qin, PAN Li-Jia, TAO Jie, CAO Jie-Ming   

  1. Nanomaterials Research Institute, College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2008-03-10 Revised:2008-05-03 Published:2008-11-20 Online:2008-11-20

摘要: 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.

关键词: 核/壳结构, CaCO3, 分形生长, 熟化理论

Abstract: 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.

Key words: Core/Shell, CaCO3, fractal growth, ripening

中图分类号: