Journal of Porous Materials

, Volume 2, Issue 3, pp 245–252 | Cite as

High surface area SiC/silicon oxycarbide glasses prepared from phenyltrimethoxysilane-tetramethoxysilane gels

  • Chunling Liu
  • Hanxi Z. Chen
  • Sridhar Komarneni
  • Carlo G. Pantano
Article

Abstract

Phenyltrimethoxysilane (PhTMS) was hydrolyzed or cohydrolyzed with tetramethoxysilane (TMOS) to make aerogels and xerogels. Porous SiC/silicon oxycarbide glasses were prepared by further pyrolyzing these gels in inert atmosphere up to 1500°C. The pore structure and chemical nature were studied by nitrogen and water sorption measurement, chemical analysis, X-ray diffraction and scanning electron microscopy. It has been found that the addition of PhTMS into TMOS gels decreased the surface area and porosity of TMOS gels, but enhanced their hydrophobicity and thermal stability. Pyrolyzing 25 mole% PhTMS-75 mole% TMOS aerogel in argon resulted in porous silicon oxycarbide glass which has a surface area of 581 m2/g at 1000°C. Pyrolyzing pure PhTMS gels at 1400°–1500°C produced porous SiC/C/silicon oxycarbide composites having surface areas in the range of 400–500 m2/g.

Keywords

aerogels xerogels oxycarbide SiC high surface area 

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Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • Chunling Liu
    • 1
  • Hanxi Z. Chen
    • 2
  • Sridhar Komarneni
    • 3
  • Carlo G. Pantano
    • 4
  1. 1.Intercollege Materials Research LaboratoryPennsylvania State UniversityUniversity Park
  2. 2.Department of Materials Science and EngineeringPennsylvania State UniversityUniversity Park
  3. 3.Intercollege Materials Research LaboratoryPennsylvania State UniversityUniversity Park
  4. 4.Department of Materials Science and EngineeringPennsylvania State UniversityUniversity Park

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