Preparation and Characterization of Silica Aerogels by Ambient Pressure Drying
YAN Qiuhui1, XIA Weidong1, LUO Jieren2, HUO Xin3
1 School of Building Services Science and Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China 2 Institute of Urban Planning and Municipal Engineering, Xi'an Polytechnic University, Xi'an 710048, China 3 Shaanxi Huaxia New Energy Technology Co., Ltd, Xi'an 710016, China
Abstract: In this dissertation, silica aerogels with super-hydrophobic were prepared via acid-base two-step modification, followed by atmospheric pressure drying process. They were synthesized with tetraethoxysilane (TEOS) as the silicon source, methyltriethoxysilane (MTES) as the precursor, ultrapure water (H2O) as the reactant, ethanol (EtOH) as solvents, hydrochloric acid (HCl) and ammonia (NH3·H2O) as catalysts. N2 adsorption-desorption test, FTIR, XRD, SEM and contact angle tests were used to characterize silica aerogels.The effect of the molar ratio of EtOH/TEOS,the molar ratio of H2O/TEOS, the pH of the sol were systematically studied for aerogel performance influences.The results indicated that the aerogels prepared with n(TEOS)∶n(MTES)∶n(EtOH)∶n(H2O)=1∶0.3∶14∶6 had the best properties. The thermal conductivity, specific surface area, average pore size, density, porosity, contact angle were 0.021 2 W/(m·K), 920 m2/g, 2—20 nm, 0.109 g/cm3, 95.05%, 158.7°, respectively.
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2020, Vol. 34 
