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Citation: WU Li-Na, HUANG Yu-Dong, WANG Zhi-Jiang, LIU Li. Preparation and Characterization of Monolithic Silica Fiber/Al₂O₃ Aerogel Composites by Non-Supercritical Drying[J]. Acta Physico-Chimica Sinica, ;2010, 26(06): 1717-1721. doi: 10.3866/PKU.WHXB20100629 shu

Preparation and Characterization of Monolithic Silica Fiber/Al₂O₃ Aerogel Composites by Non-Supercritical Drying

1.
School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001, P. R. China

Received Date: 6 January 2010
Available Online: 4 May 2010

Low-density alumina aerogel/silica fiber composites were prepared by sol-gel technology and an atmospheric pressure drying method with N,N'-dimethylformamide (DMF) as a drying control chemical additive. The variation of pore structure and specific surface area were compared with alumina aerogel without adding silica fiber based on the nitrogen adsorption-desorption method. The changes in phase structure during the heating process were characterized by X-ray diffraction. The micro-morphology of the alumina aerogel and its composites were studied in detail by scanning electron microscopy and transmission electron microscopy. The influence of DMF on the aerogel matrix is discussed. We found that the fabricated bulk composites are a close combination between alumina aerogel and silica fiber. The silica fiber improves the phase transition temperature of the alumina aerogel. An appropriate amount of DMF is helpful for the formation of a uniformgel network, thus decreasing the drying shrinkage pressure.
- Composite,
- Silica fiber/alumina aerogel,
- Non-supercritical drying,
- Drying control chemical additive
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沈阳化工大学材料科学与工程学院沈阳 110142

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Preparation and Characterization of Monolithic Silica Fiber/Al2O3 Aerogel Composites by Non-Supercritical Drying

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通讯作者: 陈斌, bchen63@163.com

Preparation and Characterization of Monolithic Silica Fiber/Al₂O₃ Aerogel Composites by Non-Supercritical Drying