A novel porous La2Zr2O7 ceramic aerogels with ultralow thermal conductivity and photocatalytic property |
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Authors: | De-bao Liu Fei-fei Zhou Li-jie Qu Yi-guang Wang Bao-sheng Xu Shi-gang Ai |
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Affiliation: | Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing, P. R. China |
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Abstract: | Porous La2Zr2O7 ceramic aerogels (CAs) were prepared by sol-gel template method and thermal treated process. The microstructure and crystallisation behavior of the samples were systematically characterized using scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), and Raman spectroscopy. The results indicated that the as-prepared porous La2Zr2O7 CAs had a single-phase pyrochlore structure with typical three-dimensional (3-D) porous structure. Meanwhile, the formation mechanisms of the as-prepared porous La2Zr2O7 CAs were investigated. At the same time, the as-prepared porous La2Zr2O7 CAs presented an ultralow room-temperature thermal conductivity of 0.07 W/(m K), high specific surface areas of 325.17 m2/g, and a relatively high compressive strength of 11.95 MPa. What's more, the as-prepared porous La2Zr2O7 CAs possessed ideal photocatalytic activities due to its high crystallinity, large surface area as well as unique 3-D porous structure. Therefore, the present work is proposing some new insight to prepare rare-earth zirconates CAs with porous structures for thermal insulation and dye degradation applications. |
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Keywords: | ceramic aerogels La2Zr2O7 photocatalytic sol-gel template method thermal conductivity |
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