Robust, Highly Thermally Stable, Core–Shell Nanostructured Metal Oxide Aerogels as High-Temperature Thermal Superinsulators, Adsorbents, and Catalysts
Robust, Highly Thermally Stable, Core–Shell Nanostructured Metal Oxide Aerogels as High-Temperature Thermal Superinsulators, Adsorbents, and Catalysts
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DOI：
10.1021/cm502886t
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发表时间：
2014-10
影响因子：
8.6
通讯作者：
Guoqing Zu;Jun Shen;Wenqin Wang;Liping Zou;Y. Lian;Zhihua Zhang;B. Liu;Fan Zhang
中科院分区：
文献类型：
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作者：
Guoqing Zu;Jun Shen;Wenqin Wang;Liping Zou;Y. Lian;Zhihua Zhang;B. Liu;Fan Zhang
采用新型醇盐化学液相沉积技术制备了具有MOX核和(MOX-SiO_2)/SiO_2壳层的高强度、高热稳定性的MOX/(MOX-SiO_2)/SiO_2核壳结构金属氧化物气凝胶。这种核壳纳米结构不仅显著增强了纳米粒子，而且有效地抑制了金属氧化物在热处理过程中的晶体生长和相变，使其耐热性从大约400-800℃提高到1000-1300°C。所得到的核壳纳米结构的氧化铝、氧化锆和二氧化钛气凝胶在1300℃、1000℃和1000℃焙烧后至少可以支撑其重量的5800倍，表现出139、186和154m2/g的高比表面积，是迄今报道的金属氧化物气凝胶的最高比表面积。结果表明，在1000℃焙烧后，核壳结构的氧化锆和二氧化钛气凝胶对染料具有增强的吸附和光催化性能。
Robust, highly thermally stable, MOx/(MOx–SiO2)/SiO2 core–shell nanostructured metal oxide aerogels with a MOx core and (MOx–SiO2)/SiO2 shell are produced via novel alkoxide chemical liquid deposition techniques. The core–shell nanostructure not only significantly reinforces the nanoparticles but also effectively inhibits the crystal growth and phase transition of metal oxide upon heat treatment, which enhances the heat resistance from approximate 400–800 °C up to 1000–1300 °C. The resultant core–shell nanostructured Al2O3, ZrO2, and TiO2 aerogels can support at least 5800 times their weight and exhibit high surface areas of 139, 186, and 154 m2/g after fired at 1300, 1000, and 1000 °C, respectively, which are the highest surface areas for metal oxide aerogels ever reported. We demonstrate that the core–shell ZrO2 and TiO2 aerogels show enhanced adsorption and photocatalytic performances, respectively, for dye after fired at 1000 °C. The core–shell Al2O3 aerogel/mullite fiber/TiO2 composite possesses ultr...