| CaCO3纳米微粒的层状液晶模板法制备及其生长过程中的形貌演变 |
| Calcium Carbonate Nanoparticles Prepared by Lamellar Liquid Crystal as Template and Shape Evolution during Growth |
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| 摘要: 在Triton X-100/n-C10H21OH/H2O体系中，低角X射线衍射测试表明层状液晶的溶剂层厚度小于3 nm。利用层状液晶为模板制备了CaCO3纳米微粒，并用透射电子显微镜(TEM)、X射线衍射(XRD)和选区电子衍射(SAED)进行了表征。TEM结果表明所得CaCO3纳米粒子的形貌为球形，粒径在2～8 nm，分布较窄。XRD表明CaCO3纳米微粒的物相为方解石型和球霰石型混合结构。在制备过程中，Ca(OH)2的加入和CaCO3纳米微粒的析出并未破坏层状液晶的对称性和长程有序性。此外，在Triton X-100/CH3CH2OH体系中，研究了CaCO3纳米微粒的生长行为，发现小的纳米微粒先通过导向聚集生长成小的梭状物，然后小的梭状物继续生长，最后发生Ostwald陈化形成较为均一的两头尖的带状纳米结构，其宽度在50～200 nm，长度约为2 μm。 |
| 关键词: 层状液晶 碳酸钙 纳米粒子 纳米带 |
| 基金项目: |
| Abstract: Low angle X-ray diffraction results indicate that the thickness of the solvent layer of the lamellar liquid crystal in Triton X-100/n-C10H21OH/H2O system is less than 3 nm. Based on the confinement of the thickness of the solvent layer, calcium carbonate nanoparticles (NPs) were prepared by replacing water with the saturated Ca(OH)2 aqueous solution. The morphology of the obtained CaCO3 NPs was spherical and their diameters were 2～8 nm with relatively narrow size distribution Experimental results demonstrate that the addition of Ca(OH)2 and the precipitation of the CaCO3 NPs does not destroy the symmetry and long-range ordering of the lamellar liquid crystal. Furthermore, the growth behavior of the CaCO3 NPs was studied in the Triton X-100/CH3CH2OH system. Corresponding morphology evaluation of the NPs was observed by TEM. The small nanoshullts were formed through the oriented aggregation of the small NPs. Then, the small nanoshuttles gradually grow larger with duration time. Finally, uniform CaCO3 nanobelts were obtained after one year. The width of the nanobelts was 50～200 nm and the length of them was above 2 μm. |
| Keywords: lamellar liquid crystal calcium carbonate nanoparticles nanoshuttles nanobelts |
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| 孙建华,丁元华,尚通明.CaCO3纳米微粒的层状液晶模板法制备及其生长过程中的形貌演变[J].无机化学学报,2007,23(1):75-80. |
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