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2006•Journal of University of Science and Technology BeijingRequires access

Preparation and surface modification of SiO_2 aerogel by ambient pressure drying

Xuanhui Qu

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Abstract

SiO_2 aerogel was prepared by using waterglass as the Si source,formamide as the catalyst and glycol as the drying chemical controlling additive(DCCA)via sol-gel method and ambient pressure drying. It is revealed that a certain amount of excessive formamide is favorable for preparation of the aerogel with high porosity,while more excessive glycol can deteriorate the formation of nano-porous SiO_2 aerogel net- work.Additionally,the pH value of the reaction system has a strong impact on the microstructure and properties of prepared SiO_2 aerogel.The aerogel modified with dimethyldiethoxysilane(DMDEOS)shows an excellent hydrophobic feature.The structure and properties of hydrophobic silica aerogel were analyzed by Fourier transform infrared spectra(FTIR),thermogravimetric(TG)and Differential Scanning Calorimetry(DSC).

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What this paper is about

SiO_2 aerogel was prepared by using waterglass as the Si source,formamide as the catalyst and glycol as the drying chemical controlling additive(DCCA)via sol-gel method and ambient pressure drying. It is revealed that a certain amount of excessive formamide is favorable for preparation of the aerogel with high porosity,while more excessive glycol can deteriorate the formation of nano-porous SiO_2 aerogel net- work.Additionally,the pH value of the reaction system has a strong impact on the microstructure and properties of prepared SiO_2 aerogel.The aerogel modified with dimethyldiethoxysilane(DMDEOS)shows an excellent hydrophobic feature.The structure and properties of hydrophobic silica aerogel were analyzed by Fourier transform infrared spectra(FTIR),thermogravimetric(TG)and Differential Scanning Calorimetry(DSC).

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Available abstract

SiO_2 aerogel was prepared by using waterglass as the Si source,formamide as the catalyst and glycol as the drying chemical controlling additive(DCCA)via sol-gel method and ambient pressure drying. It is revealed that a certain amount of excessive formamide is favorable for preparation of the aerogel with high porosity,while more excessive glycol can deteriorate the formation of nano-porous SiO_2 aerogel net- work.Additionally,the pH value of the reaction system has a strong impact on the microstructure and properties of prepared SiO_2 aerogel.The aerogel modified with dimethyldiethoxysilane(DMDEOS)shows an excellent hydrophobic feature.The structure and properties of hydrophobic silica aerogel were analyzed by Fourier transform infrared spectra(FTIR),thermogravimetric(TG)and Differential Scanning Calorimetry(DSC).

Key concepts: Aerogel, Formamide, Materials science, Thermogravimetric analysis, Differential scanning calorimetry, Ambient pressure, Chemical engineering, Fourier transform infrared spectroscopy

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