Syntheses of Opened Hollow Clay Microspheres through a Spray-Drying Approach and Their Derivative Clay/Carbon Nanotubes Composites
Syntheses of Opened Hollow Clay Microspheres through a Spray-Drying Approach and Their Derivative Clay/Carbon Nanotubes Composites
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DOI：
10.1021/jp712101f
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发表时间：
2008-04
影响因子：
3.7
通讯作者：
Xiaohua Du;Zhiwei Jiang;Xiaoyu Meng;Zhe Wang;Haiou Yu;Meiye Li;T. Tang
中科院分区：
文献类型：
--
作者：
Xiaohua Du;Zhiwei Jiang;Xiaoyu Meng;Zhe Wang;Haiou Yu;Meiye Li;T. Tang
以烷基磺酸钠改性的钠基蒙脱土（Na+-MMT）为原料，通过喷雾干燥制备了有机粘土空心微球。利用广角X射线衍射、场发射扫描电镜和热重分析等手段对空心球的微观结构和热性能进行了表征。结果表明，有机粘土的层间距比纯Na+-MMT大，热稳定性比烷基磺酸盐高。对这种新结构的形成原因进行了探讨。通过对不同分子长度烷基磺酸盐有机粘土的形貌研究，发现中空微球的形成与有机粘土的插层结构有关。有机粘土的层间距越大，形成的空心微球越多。此外，Co ~（2+）离子在蒙脱土孔道中的插层作用也较好。
Opened hollow microspheres of organoclays were prepared via spray drying the suspension of modified Na+−montmorillonite (Na+-MMT) with alkylsulfonate. The microstructure and thermal properties of these opened hollow spheres were characterized by means of wide-angle X-ray diffraction, field emission scanning electron microscopy, and thermogravimetric analysis. The results showed that the organoclays had larger interlayer spacing compared with pure Na+-MMT and higher thermal stability relative to the alkylsufonate. The reason for the formation of this novel structure was investigated. On the basis of the morphological investigation of the organoclays containing alkylsulfonate with different molecular length, the formation of the opened hollow microspheres was found to be related to the intercalation structure of the organoclays. The larger the interlayer distance of the organoclays was, the more the opened hollow microspheres were formed. Moreover, intercalating Co2+ ion within MMT galleries of the opened h...