Super thermal insulating SiO2 cryogels prepared by vacuum freeze drying

Lifen Su, Lei Miao, Gang Xu, Sakae Tanemura

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)

Abstract

Traditionally, silica aerogels with low thermal conductivity are prepared by supercritical drying, however, the process is expensive and hazardous due to it run in autoclaves. In order to overcome these disadvantages, a cheaper and safer process, drying at ambient pressure has been developed for decades, but tedious repetitive gel washing and solvent exchange steps are involved. Therefore, in the present study, a novel vacuum freeze-drying was utilized to prepare the super thermal insulating SiO2 cryogels. The wet gels were synthesized via acid-base catalysis using tetraethoxysilane (TEOS) as a silica precursor and ethanol as a solvent. After vacuum freeze drying, nanoporous SiO2 cryogels with low density in the range of 0.08-0.15 g/cm 3 were obtained.

Original languageEnglish
Title of host publicationChinese Ceramics Communications
PublisherTrans Tech Publications
Pages851-854
Number of pages4
Edition1
ISBN (Print)0878492755, 9780878492756
Publication statusPublished - 2010
Externally publishedYes
Event6th China International Conference on High-Performance Ceramics, CICC-6 - Harbin, China
Duration: 2009 Aug 162009 Aug 19

Publication series

NameAdvanced Materials Research
Number1
Volume105-106
ISSN (Print)1022-6680

Conference

Conference6th China International Conference on High-Performance Ceramics, CICC-6
CountryChina
CityHarbin
Period09/8/1609/8/19

Keywords

  • Sio cryogels
  • Super thermal insulating
  • Vacuum freeze-drying

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Su, L., Miao, L., Xu, G., & Tanemura, S. (2010). Super thermal insulating SiO2 cryogels prepared by vacuum freeze drying. In Chinese Ceramics Communications (1 ed., pp. 851-854). (Advanced Materials Research; Vol. 105-106, No. 1). Trans Tech Publications.