A family of ordered mesoporous carbons derived from mesophase pitch using ordered mesoporous silicas as templates |
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Authors: | Liang Cao Michal Kruk |
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Institution: | 1. Center for Engineered Polymeric Materials, Department of Chemistry, College of Staten Island, City University of New York, 2800 Victory Boulevard, Staten Island, NY, 10314, USA 2. Graduate Center, City University of New York, 365 Fifth Avenue, New York, NY, 10016, USA
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Abstract: | A variety of ordered mesoporous carbons (OMCs) were synthesized using ordered mesoporous silicas (OMSs) as hard templates and the mesophase pitch (MP) as a carbon precursor. The synthesis included the mixing of OMS with MP, the infiltration of OMS with MP at 450–550?°C and the carbonization of MP in OMS/MP composite followed by the dissolution of the OMS template. OMCs with structures of two-dimensional hexagonal arrays of nanorods and three-dimensional arrays of nanospheres were obtained through the replication of silica templates, including large-pore SBA-15, KIT-6, large-pore FDU-12 and SBA-16. In particular, 2-D hexagonal array of carbon nanorods (CMK-3 carbon) with (100) interplanar spacing of ~13 nm as well as an array of carbon nanospheres arranged in the face-centered cubic structure with the unit-cell parameter of 33 nm were successfully prepared. The specific surface areas of the resulting carbons were up to 400 m2/g, and the total pore volumes were up to 0.43 cm3/g, with the highest values achieved when the MP infiltration temperature was 500?°C. The OMCs exhibited narrow mesopore size distributions. As inferred from XRD, the frameworks of OMCs featured semi-graphitic structures even though moderate carbonization temperature (850?°C) was employed. |
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