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Hydrophobic Silica Aerogels Prepared by Sol-gel One-step Solvent Exchange and Surface Modification Process

OU Ye-xiu

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Abstract

In this paper,a new method to produce hydropbic silica aerogels was introduced.SiO2 alcogels were prepared by tetraethoxysilane(TEOS) via the two-step acid-base sol-gel process,then the solvent was exchanged and the surface was modified by ethanol/hexmethyldisilazane/hexane,and finally dried at the ambient pressure.The structure,appearance and properties of the silica aerogels have been investigated by FTIR,XRD,TG-DSC,F-SEM,BET.Results showed that the one-step solvent exchange and surface modification process can reduce the time.The aerogels have a high surface area,which can be as high as 842.63 m2/g.The density of the aerogels is low(130 kg/m3),the diameter of the particle size is about 15 nm.the diameter of the pore sizes is in the range of 2～170 nm.The aerogels show an excellent hydrophobic feature.

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What this paper is about

In this paper,a new method to produce hydropbic silica aerogels was introduced.SiO2 alcogels were prepared by tetraethoxysilane(TEOS) via the two-step acid-base sol-gel process,then the solvent was exchanged and the surface was modified by ethanol/hexmethyldisilazane/hexane,and finally dried at the ambient pressure.The structure,appearance and properties of the silica aerogels have been investigated by FTIR,XRD,TG-DSC,F-SEM,BET.Results showed that the one-step solvent exchange and surface modification process can reduce the time.The aerogels have a high surface area,which can be as high as 842.63 m2/g.The density of the aerogels is low(130 kg/m3),the diameter of the particle size is about 15 nm.the diameter of the pore sizes is in the range of 2～170 nm.The aerogels show an excellent hydrophobic feature.

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Available abstract

In this paper,a new method to produce hydropbic silica aerogels was introduced.SiO2 alcogels were prepared by tetraethoxysilane(TEOS) via the two-step acid-base sol-gel process,then the solvent was exchanged and the surface was modified by ethanol/hexmethyldisilazane/hexane,and finally dried at the ambient pressure.The structure,appearance and properties of the silica aerogels have been investigated by FTIR,XRD,TG-DSC,F-SEM,BET.Results showed that the one-step solvent exchange and surface modification process can reduce the time.The aerogels have a high surface area,which can be as high as 842.63 m2/g.The density of the aerogels is low(130 kg/m3),the diameter of the particle size is about 15 nm.the diameter of the pore sizes is in the range of 2～170 nm.The aerogels show an excellent hydrophobic feature.

Key concepts: Solvent, Materials science, Chemical engineering, Sol-gel, Aerogel, Hexane, Surface modification, Fourier transform infrared spectroscopy

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Hydrophobic Silica Aerogels Prepared by Sol-gel One-step Solvent Exchange and Surface Modification Process — Research Paper | ScholarLens