不同晶相草酸钙晶体的选区电子衍射和X射线衍射比较分析

在卵磷脂-水脂质体中制备了一水草酸钙(COM)、二水草酸钙(COD)和三水草酸钙(COT).并对它们分别进行了透射电镜(TEM)、选区电子衍射分析(SAED)和X射线衍射(XRD)分析.TEM结果表明,COM、COD和COT均为泡状,粒径约80～150nm.将SAED结果与XRD结果对比分析,发现将SAED图谱指标化后所得的衍射数据与XRD的特征峰值基本相符,但在相对强度上存在差别.本实验结果表明,将TEM、SAED和XRD技术联合分析纳米级草酸钙晶体,不但可以观察纳米级草酸钙的形貌,而且能对其晶相、单晶和多晶等进行深入的了解.

Comparative Analysis on Various Calcium Oxalate Hydrates by SAED and XRD

Calcium oxalate monohydrate (COM), dihydrate (COD) and trihydrate (COT) prepared in Lecithin-water liposomes were characterized by transmission electron microscope (TEM), selected area electron diffraction (SAED) and X-ray powder diffraction (XRD), respectively. TEM results show that the COM, COD and COT crystals grown in vesicles are nanoparticles with a diameter of about 80-150 nm. Compared the results of SAED with that of XRD, the characteristic diffraction peaks of the three calcium oxalate hydrates in XRD patterns were in agreement with the diffraction data of their corresponding SAED after indexing. But the relative intensity is different. The results of this work show that if combined the results obtained by TEM, SAED and XRD, not only the morphology of calcium oxalate nanoparticles could be observed, but also their phase composition, monocrystalline and polycrystalline structure, etc. could be obtained.