Abstract
Hierarchically porous carbon monoliths with high specific surface area have been prepared via a nano-phase extraction technique from carbon/silica composites which had been prepared from arylene-bridged polysilsesquioxanes. The nano-sized silica phase developed in the composite has been removed to increase micropores, resulting in a similar effect to thermal activation of carbons. The conventional thermal activation processes using CO2 and water vapor have suffered from structural heterogeneity between the inner and outer parts of the monoliths due to the difference in the degree of exposure to the activating gas. However, the carbon monoliths obtained by a nano-phase extraction technique are expected to possess homogeneously distributed micropores. The changes of the pore characteristics through the synthesis process by the nitrogen adsorption–desorption method and mercury porosimetry. In particular, the growth of silica phase in carbon/silica composites at different temperatures has been characterized by the micropore analysis using the Horváth–Kawazoe method.
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Hasegawa, G. (2013). Hierarchically Porous Carbon Monoliths with High Surface Area from Arylene-Bridged Polysilsesquioxanes Without Thermal Activation Process. In: Studies on Porous Monolithic Materials Prepared via Sol–Gel Processes. Springer Theses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54198-1_12
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