Acta Chimica Sinica ›› 2006, Vol. 64 ›› Issue (22): 2231-2234. Previous Articles     Next Articles

Original Articles

规整、均一纳米水滑石晶体的水热合成与表征

郑建华1, 田熙科1,2, 俞开潮*,3, 王龙艳1, 杨超1, 何明中1   

  1. (1中国地质大学材料科学和化学工程学院 武汉 430074)
    (2中国科学院固体物理研究所 合肥 230031)
    (3华中科技大学化学系 武汉 430074)
  • 收稿日期:2006-05-23 修回日期:2006-07-17 出版日期:2006-11-28 发布日期:2006-11-28
  • 通讯作者: 俞开潮

Hydrothermal Synthesis and Characterization of Regular and Ho-mogeneous Nanocrystalline Hydrotalcite

ZHENG Jian-Hua1; TIAN Xi-Ke1,2; YU Kai-Chao*,3; WANG Long-Yan1; YANG Chao1; HE Ming-Zhong1   

  1. (1 College of Material Science and Chemical Engineering, China University of Geosciences, Wuhan 430074)
    (2 Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031)
    (3 Department of Chemistry, Huazhong University of Science and Tech-nology, Wuhan 430074)
  • Received:2006-05-23 Revised:2006-07-17 Online:2006-11-28 Published:2006-11-28
  • Contact: YU Kai-Chao

A simple and novel method was developed to synthesize Mg-Al-CO3 hydrotalcite. With this method, Mg2+/Al3+/CO32- hydrotalcite with molar ratio of 6∶2∶1 was hydrothermally synthesized. The synthesized Mg-Al-CO3 hydrotalcite samples were characterized by X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), transmission electron microscope (TEM), high resolution transmission electron microscopy (HRTEM) and thermal analysis (TG-DSC). The FE-SEM, TEM and HRTEM images show that the hydrotalcite has morphology of a homogeneous and regular hexagonal sheet with thickness of about 20 nm. The XRD results indicated that the synthesized Mg-Al-CO3 hydrotalcite was well crystallized. Furthermore, the distribution of particle size was analyzed with dynamic light scattering technique. The results are consistent with the SEM images and the measured diameter of each hexagon in hydrotalcite is about 350 nm. The effects of preparation condition on the micro-structure were also investigated. It is found that the diameter of the sheet crystal, rather than the morphology, is influenced by hydrothermal treatment temperature and time, indicating that increasing treatment temperature and time only results in larger hexagonal crystal.

Key words: hydrotalcite, hydrothermal synthesis, crystal morphology, particle size