Hydrophobic Sio2 Aerogels Prepared with Polyethoxydisiloxanes

Journal of Inorganic Materials

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Hydrophobic Sio₂ Aerogels Prepared with Polyethoxydisiloxanes

DENG Zhong-Sheng¹; WEI Jian-Dong¹; Wu Ai-Mei²; BAO Yu-Ping¹; WANG Jue¹; SHEN Jun¹; ZHOU Bin¹; CHEN Ling-Yan ¹

1. Pohl Institute of Solid State Physics; Tongji University; Shanghai 200092; China; 2. Shanghai Institute of Chemical Engineering; Shanghai 200062; China

Received:1999-05-10 Revised:1999-05-26 Published:2000-04-20 Online:2000-04-20

Abstract

Abstract: Hydrophobic SiO₂ aerogels were produced by the surface modification of alcogels prepared via sol-gel process using polyethoxydisiloxanes (E-40) as
the precursor and followed by ethanol supercritical drying. The structure of the modified silica aerogels was a silica matrix produced by hydrolysis and
condensation of polyethoxydisiloxanes. Si-CH₃ was modified on the surface of the silica matrix. The pore size decreased from 23.1nm to 18.2nm, the
specific surface area increased from 477 m²·g^-1 to 563 m²·g^-1 and the water vapor adsorption decreased from 0.04 to 0.0012(weight ratio)
after the surface modification of silica aerogels. The existence of Si-CH₃ was observed using infrared spectra.

Key words: hydrophobic, SiO₂ aerogel, sol-gel, surface modification, super critical drying

CLC Number:

TM285

DENG Zhong-Sheng,WEI Jian-Dong,Wu Ai-Mei,BAO Yu-Ping,WANG Jue,SHEN Jun,ZHOU Bin,CHEN Ling-Yan. Hydrophobic Sio₂ Aerogels Prepared with Polyethoxydisiloxanes[J]. Journal of Inorganic Materials.

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Hydrophobic Sio₂ Aerogels Prepared with Polyethoxydisiloxanes

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