Hierarchical microstructure and formative mechanism of low-density molybdena-based aerogel derived from MoCl5
Hierarchical microstructure and formative mechanism of low-density molybdena-based aerogel derived from MoCl5
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DOI：
10.1007/s10971-010-2381-8
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发表时间：
2011-04
影响因子：
2.5
通讯作者：
Ai Du;Bin Zhou;Yanhong Zhong;Xiurong Zhu;G. Gao;Guang-ming Wu;Zhihua Zhang;Jun Shen
中科院分区：
文献类型：
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作者：
Ai Du;Bin Zhou;Yanhong Zhong;Xiurong Zhu;G. Gao;Guang-ming Wu;Zhihua Zhang;Jun Shen
以MoCl 5为前驱体，聚丙烯酸（PAA）为添加剂，环氧丙烷为凝胶促进剂，采用分散无机溶胶-凝胶法，CO2超临界流体干燥，制备了低密度150 kg/m3的凹凸棒石气凝胶。表征的组合物表明，合成气凝胶是由氧化钼和PAA衍生物;电子显微镜照片显示的分层结构的气凝胶，包括球形的二次粒子和根状的初级纤维。通过对PAA的配位状态和特殊形态的分析，认为PAA的加入不仅引导了初生纤维的生长，而且促进了二次粒子之间的交联，形成了一种坚固的骨架。
Low density 150 kg/m3molybdena-based aerogel was prepared by using MoCl5as precursor, polyacrylic acid (PAA) as additive and propylene oxide as gelation accelerator via the dispersed inorganic sol–gel method, followed by carbon dioxide supercritical fluid drying. Characterizations of the composition indicate that the as-synthesized aerogel is composed of molybdenum oxide and PAA derivatives; electron microscopy photographs show the hierarchical microstructure of the aerogel, including both spherical secondary particles and root-like primary fibers. Based on the analysis of coordination state and special morphology, it is suggested that the additive PAA not only guides the growth of the primary fibers but improves the crosslinkage between the secondary particles to form a robust skeleton.