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Mullite Nanosheet/Titania Nanorod/Silica Composite Aerogels for High-Temperature Thermal Insulation
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2023-08-31 , DOI: 10.1021/acsanm.3c03571 Qiyan Ji 1 , Zizhong Chen 1 , Shicui Xing 1 , Xiuling Jiao 1 , Dairong Chen 1
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2023-08-31 , DOI: 10.1021/acsanm.3c03571 Qiyan Ji 1 , Zizhong Chen 1 , Shicui Xing 1 , Xiuling Jiao 1 , Dairong Chen 1
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Ceramic aerogels play an essential role in the field of high-temperature insulation. However, the significant radiation heat transfer limits the practical applicability. Herein, we have chosen mullite nanosheets prepared successfully by chemical blowing as structural assembly units, modified on the surface of mullite nanosheets with TiO2 nanorods to reduce infrared radiation heat transfer, and prepared mullite nanosheet/TiO2 nanorod/silica composite aerogels by adding silica sols as high-temperature binder cast molding in the system. The preferred composite aerogels have good temperature resistance, and the linear shrinkage was measured to be only 2% after calcination at 1500 °C for 30 min and had a low thermal conductivity (0.0356 W·m–1·K–1 at room temperature and 0.118 W·m–1·K–1 at 1000 °C). This assembly concept pervades a strategy for developing porous aerogel materials for insulation and protection in extreme environments.
中文翻译：
用于高温隔热的莫来石纳米片/二氧化钛纳米棒/二氧化硅复合气凝胶
陶瓷气凝胶在高温隔热领域发挥着至关重要的作用。然而，显着的辐射传热限制了实际应用。本文选择化学吹制成功制备的莫来石纳米片作为结构组装单元，通过TiO 2纳米棒对莫来石纳米片表面进行修饰以减少红外辐射传热，通过添加二氧化硅制备莫来石纳米片/TiO 2纳米棒/二氧化硅复合气凝胶溶胶作为高温粘结剂浇注成型制得。优选的复合气凝胶具有良好的耐温性，在1500 ℃下煅烧30 min后测得线性收缩率仅为2%，并且具有较低的导热系数（0.0356 W·m –1 · K –1室温下为 0.118 W·m –1 ·K –1（1000 °C 下）。这种组装概念贯穿于开发用于极端环境下绝缘和保护的多孔气凝胶材料的策略。
更新日期：2023-08-31
中文翻译：
用于高温隔热的莫来石纳米片/二氧化钛纳米棒/二氧化硅复合气凝胶
陶瓷气凝胶在高温隔热领域发挥着至关重要的作用。然而，显着的辐射传热限制了实际应用。本文选择化学吹制成功制备的莫来石纳米片作为结构组装单元，通过TiO 2纳米棒对莫来石纳米片表面进行修饰以减少红外辐射传热，通过添加二氧化硅制备莫来石纳米片/TiO 2纳米棒/二氧化硅复合气凝胶溶胶作为高温粘结剂浇注成型制得。优选的复合气凝胶具有良好的耐温性，在1500 ℃下煅烧30 min后测得线性收缩率仅为2%，并且具有较低的导热系数（0.0356 W·m –1 · K –1室温下为 0.118 W·m –1 ·K –1（1000 °C 下）。这种组装概念贯穿于开发用于极端环境下绝缘和保护的多孔气凝胶材料的策略。
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