介绍了一种基于正硅酸乙酯(TEOS)的疏水SiO2气凝胶的制备及其表征方法.结果表明,最后制备的气凝胶具有一定塑性,可进行机械加工.
The stiffness and hydrophobicity of teteraehoxysilane(TEOS)-based silica aerogels were characterized.The 2-step TEOS-based alcogels were made from TEOS,ethanol(EtOH),water(H2O),hydrochloric acid(HCI)and ammonia(NH4OH)in the total molar ratio of 1:(2～10):5:9.7×10-4:(1.2 ×10-3～2.2 ×10-3).We disclosed how the strength and stiffness of a wet gel can be improved by aging in a mixed solution of water/ethanol(10 vol%)at 40℃ for 24 h and how this influence the aerogels'properties.The linear shrinkage during supercritical drying was reduced from 12.5%to 2.3%by aging the water/ethanol washed gel in TEOS/ethanol and HDMSA/ethanol solution,respectively.
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