新型纳米层状硅酸盐Magadiite主体材料的制备、表征、结构和生成机理研究

利用简单的插层反应方法成功地制备了四丁基氢氧化铵(TBAOH)插层的层状硅酸盐Magadiite纳米复合材料,在室温下该材料溶胶放置30d可以保持稳定,粉体长期保存结构稳定,而且反应时间短,只需30min.利用XRD,FTIR,SEM和HRTEM等方法对样品进行了结构表征.结果表明,TBA⁺离子在层间以双分子层排列,并与层状硅酸盐结合在一起,TBAOH插层后的纳米粒子在玻璃片上进行了重组,粒径分布在10～100nm之间;HRTEM电镜照片进一步证实了剥离的层状硅酸盐纳米粒子在玻璃片上的自组装过程.根据实验结果阐述了TBAOH插层反应形成纳米溶胶的机理.

Preparation, Characterization, Structure and Formation Mechanism of a Novel Layered Structural Nanosilicate Magadiite Host

Stable layered structural silicate nanocomposites of TBAOH intercalated magadiite were obtained successfully by intercalation reaction methods. XRD, FTIR, SEM and HRTEM were used to characterize the structures of these nanocomposites. The XRD results and the approximate calculation of the interlayer distances show that a novel kind of structure with bilayer TBA+ ion intercalated magadiite was formed, further proved by HRTEM image and FTIR spectra. SEM image shows that the particle sizes exfoliated by TBAOH are about 10—100 nm. The reassembly of particles on the glass were also found after the solution evaporated. The self-assembly process of magadiite nanosheets was described on the basis of HRTEM analyses. These nanocomposites of layered magadiite are the potentional candidates of hosts of 2-dimensional host-guest nanocomposites and functional nanomaterials with open frameworks.