A new route to monolithic macroporous SiC/C composites from biphenylene-bridged polysilsesquioxane gels

Joji Hasegawa, Kazuyoshi Kanamori, Kazuki Nakanishi, Teiichi Hanada

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

Macroporous polysilsesquioxane monoliths have been synthesized from biphenylene-bridged alkoxysilane via the sol-gel transition and concurrent phase separation both induced by the polycondensation reaction. The obtained polysilsesquioxane gels have been subsequently converted to macroporous SiC/C composites by the carbothermal reduction. The SiC/C monoliths thus obtained involve no visible cracks and their porosity reaches as high as >90%. In addition, according to the nitrogen adsorption-desorption measurement results, the micro- and mesopore characteristics of the samples did not undergo a significant change during the carbothermal reduction and the SiC/C composites have large specific surface areas owing to the microporous carbons in the skeletons. These composites therefore are more suitable for the applications to gas storage and catalyst supports compared to pure SiC.

Original languageEnglish
Pages (from-to)2541-2547
Number of pages7
JournalChemistry of Materials
Volume22
Issue number8
DOIs
Publication statusPublished - Apr 27 2010
Externally publishedYes

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Carbothermal reduction
Gels
Composite materials
Polycondensation
Catalyst supports
Specific surface area
Phase separation
Sol-gels
Desorption
Nitrogen
Carbon
Porosity
Cracks
Adsorption
polysilsesquioxane

All Science Journal Classification (ASJC) codes

  • Materials Chemistry
  • Chemical Engineering(all)
  • Chemistry(all)

Cite this

A new route to monolithic macroporous SiC/C composites from biphenylene-bridged polysilsesquioxane gels. / Hasegawa, Joji; Kanamori, Kazuyoshi; Nakanishi, Kazuki; Hanada, Teiichi.

In: Chemistry of Materials, Vol. 22, No. 8, 27.04.2010, p. 2541-2547.

Research output: Contribution to journalArticle

Hasegawa, Joji ; Kanamori, Kazuyoshi ; Nakanishi, Kazuki ; Hanada, Teiichi. / A new route to monolithic macroporous SiC/C composites from biphenylene-bridged polysilsesquioxane gels. In: Chemistry of Materials. 2010 ; Vol. 22, No. 8. pp. 2541-2547.
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