TY - JOUR
T1 - Synthesis of ordered mesoporous silicon oxycarbide monoliths via preceramic polymer nanocasting
AU - Yuan, Xiaoyan
AU - Jin, Helin
AU - Yan, Xingbin
AU - Cheng, Laifei
AU - Hu, Litian
AU - Xue, Qunji
PY - 2012/1
Y1 - 2012/1
N2 - Highly ordered mesoporous silicon oxycarbide (SiOC) monoliths have been synthesized using liquid poly(hydridomethylsiloxane) (PHMS) as starting preceramic polymer and mesoporous carbon CMK-3 as direct template. Monolithic SiOC-carbon composites were generated via nanocasting of PHMS into CMK-3, pressing without any additive, cross-linking at 150 °C under humid air and subsequent thermolysis at 1000 or 1200 °C under argon atmosphere. The carbon template was finally removed by the thermal treatment at 1000 °C in an ammonia atmosphere, as a result of the generation of monolithic SiOC ceramics with ordered mesoporous structures. The products were characterized by scanning electron and transmission electron microscopes, X-ray diffraction, Fourier transformation infrared spectrometer, X-ray photoelectron spectroscope and nitrogen absorption-desorption analyzer. The as-prepared SiOC monoliths exhibited crack-free, ordered 2-dimentional hexagonal p6mm symmetry with high specific surface areas. With increasing the calcination temperature, the ordered mesoporous structure was still remained and the specific surface area just had a slight reduction from 616 to 602 m2 g-1. Moreover, the porous SiOC monoliths possessed good compression strengths and anti-oxidation properties.
AB - Highly ordered mesoporous silicon oxycarbide (SiOC) monoliths have been synthesized using liquid poly(hydridomethylsiloxane) (PHMS) as starting preceramic polymer and mesoporous carbon CMK-3 as direct template. Monolithic SiOC-carbon composites were generated via nanocasting of PHMS into CMK-3, pressing without any additive, cross-linking at 150 °C under humid air and subsequent thermolysis at 1000 or 1200 °C under argon atmosphere. The carbon template was finally removed by the thermal treatment at 1000 °C in an ammonia atmosphere, as a result of the generation of monolithic SiOC ceramics with ordered mesoporous structures. The products were characterized by scanning electron and transmission electron microscopes, X-ray diffraction, Fourier transformation infrared spectrometer, X-ray photoelectron spectroscope and nitrogen absorption-desorption analyzer. The as-prepared SiOC monoliths exhibited crack-free, ordered 2-dimentional hexagonal p6mm symmetry with high specific surface areas. With increasing the calcination temperature, the ordered mesoporous structure was still remained and the specific surface area just had a slight reduction from 616 to 602 m2 g-1. Moreover, the porous SiOC monoliths possessed good compression strengths and anti-oxidation properties.
KW - Mesoporous
KW - Monolith
KW - Nanocasting
KW - Polymer-derived ceramic
KW - SiOC ceramic
UR - http://www.scopus.com/inward/record.url?scp=80052918602&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2011.06.025
DO - 10.1016/j.micromeso.2011.06.025
M3 - 文章
AN - SCOPUS:80052918602
SN - 1387-1811
VL - 147
SP - 252
EP - 258
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 1
ER -