Nanocomposite aerogels: The SiO_2–Al_2O_3 system

Nanocomposite aerogels: The SiO_2–Al_2O_3 system
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纳米复合气凝胶:SiO_2–Al_2O_3 体系

DOI:
10.1557/jmr.1993.3163
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发表时间:
1993
影响因子:
2.7
通讯作者:
E. Breval
E. Breval
中科院分区:
材料科学4区
文献类型:
--
作者:
S. Komarneni;R. Roy;U. Selvaraj;P. Malla;E. Breval

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采用不同的技术制备了两种铝硅酸盐组成的单块纳米复合气凝胶,并对其进行了表征。结果表明,与单组分气凝胶不同,通过在1000 °C下加热,可以在上述纳米复合气凝胶中保持高表面积和中孔性。作为第二相的氧化铝的存在阻止了它们的致密化,这导致在1000 °C热处理后,表面积为500-600 m^2/g,中孔直径约为5-6 nm。这些新型纳米复合气凝胶有望在高温下应用于分离、绝缘、催化等领域。
Monolithic nanocomposite aerogels of two aluminosilicate compositions have been prepared and characterized by different techniques. The results show that high surface area and mesoporosity can be preserved in the above nanocomposite aerogels by heating at 1000 °C, unlike the single component aerogels. The presence of alumina as a second phase prevented their densification which resulted in surface areas on the order of 500–600 m^2/g and mesopores of about 5–6 nm in diameter after heat treatment at 1000 °C. These novel nanocomposite aerogels are expected to find applications at high-temperatures in separations, insulation, catalysis, etc.
S.Yamanaka:“功能层状纳米复合材料的设计与合成”AmllCeram.Soc.Bull。
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