2O3 doped, Al2O3 aerogel, heat treatment, phase transition, thermal stability"/> 2O3 doped alumina aerogels with different La2O3 contents are prepared by using aluminum tri-sec-butoxide as precursor via sol-gel route combined with acetone-aniline in situ water formation (ISWF) method, followed by supercritical fluid drying. The effect of La2O3 on microstructure and thermal stability of alumina aerogels is investigated by SEM, TEM, XRD and N2 adsorption. The results show that the morphology of alumina aerogels changes from sphere like accumulated to notably sheet like stacked with the doping of La2O3. An appropriate amount of La2O3 doping can enhance the specific surface area of alumina aerogels, and the 9 mol% La2O3 doping aerogels has the largest specific surface area. In addition, the alumina crystal growth and phase transition of the aerogels upon heat treatment are effectively inhibited by La2O3 doping, which significantly improves the thermal stability of the aerogels. After heat treatment at 1200℃ for 2h, the phase of 9 mol% La2O3 doped alumina aerogel remains in the θ-Al2O3 while that of undoped one is a-Al2O3, and the specific surface area of 9 mol% La2O3 doped alumina aerogel is 86.5 m2/g which is higher than the undoped one (46 m2/g)."/>

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Fabrication and Thermal Stability of La2O3 Doped Alumina Aerogel
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Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology,Tongji University,Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology,Tongji University,Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology,Tongji University,Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology,Tongji University,Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology,Tongji University,Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology,Tongji University

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National Key Research and Development Program of China (2017YFA0204600)

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    Abstract:

    La2O3 doped alumina aerogels with different La2O3 contents are prepared by using aluminum tri-sec-butoxide as precursor via sol-gel route combined with acetone-aniline in situ water formation (ISWF) method, followed by supercritical fluid drying. The effect of La2O3 on microstructure and thermal stability of alumina aerogels is investigated by SEM, TEM, XRD and N2 adsorption. The results show that the morphology of alumina aerogels changes from sphere like accumulated to notably sheet like stacked with the doping of La2O3. An appropriate amount of La2O3 doping can enhance the specific surface area of alumina aerogels, and the 9 mol% La2O3 doping aerogels has the largest specific surface area. In addition, the alumina crystal growth and phase transition of the aerogels upon heat treatment are effectively inhibited by La2O3 doping, which significantly improves the thermal stability of the aerogels. After heat treatment at 1200℃ for 2h, the phase of 9 mol% La2O3 doped alumina aerogel remains in the θ-Al2O3 while that of undoped one is a-Al2O3, and the specific surface area of 9 mol% La2O3 doped alumina aerogel is 86.5 m2/g which is higher than the undoped one (46 m2/g).

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[Zou Wenbing, Shen Jun, Zou Liping, Wu Yu, Zu Guoqing, Wang Xiaodong. Fabrication and Thermal Stability of La2O3 Doped Alumina Aerogel[J]. Rare Metal Materials and Engineering,2018,47(S2):99~103.]
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History
  • Received:December 04,2017
  • Revised:December 04,2017
  • Adopted:February 01,2018
  • Online: November 01,2018
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