caa a22 4500 477091725 CHVBK 20180405111516.0 cr unu---uuuuu 170330e19960901xx s 000 0 eng 10.1007/BF00488115 doi (NATIONALLICENCE)springer-10.1007/BF00488115 High surface area SiC/silicon oxycarbide glasses prepared from phenyltrimethoxysilane-tetramethoxysilane gels [Elektronische Daten] [Chunling Liu, Hanxi Chen, Sridhar Komarneni, Carlo Pantano] 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. Kluwer Academic Publishers, 1996 aerogels nationallicence xerogels nationallicence oxycarbide nationallicence SiC nationallicence high surface area nationallicence Liu Chunling Intercollege Materials Research Laboratory, Pennsylvania State University, 16802, University Park, Pennsylvania aut Chen Hanxi Department of Materials Science and Engineering, Pennsylvania State University, 16802, University Park, Pennsylvania aut Komarneni Sridhar Intercollege Materials Research Laboratory, Pennsylvania State University, 16802, University Park, Pennsylvania aut Pantano Carlo Department of Materials Science and Engineering, Pennsylvania State University, 16802, University Park, Pennsylvania aut Journal of Porous Materials Springer Netherlands 2/3(1996-09-01), 245-252 1380-2224 2:3<245 1996 2 10934 https://doi.org/10.1007/BF00488115 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00488115 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Liu Chunling Intercollege Materials Research Laboratory, Pennsylvania State University, 16802, University Park, Pennsylvania aut NATIONALLICENCE 700 1- Chen Hanxi Department of Materials Science and Engineering, Pennsylvania State University, 16802, University Park, Pennsylvania aut NATIONALLICENCE 700 1- Komarneni Sridhar Intercollege Materials Research Laboratory, Pennsylvania State University, 16802, University Park, Pennsylvania aut NATIONALLICENCE 700 1- Pantano Carlo Department of Materials Science and Engineering, Pennsylvania State University, 16802, University Park, Pennsylvania aut NATIONALLICENCE 773 0- Journal of Porous Materials Springer Netherlands 2/3(1996-09-01), 245-252 1380-2224 2:3<245 1996 2 10934 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer