Journal
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
Volume 15, Issue 2, Pages 156-166Publisher
SPRINGER
DOI: 10.1007/s10450-009-9165-x
Keywords
Nitrogen adsorption; SBA-15; Micelle-templated material; Cylindrical pore
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Funding
- Dean of Science and Engineering
- CSI/CUNY
- New York State Office of Science, Technology and Academic Research (NYSTAR)
- National Science Foundation [DMR-0225180]
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Poly(ethylene oxide)-poly(methyl acrylate) diblock copolymers with narrow molecular weight distributions were synthesized using atom transfer radical polymerization. The copolymers were used as micellar templates for the synthesis of mesoporous silicas. The products were characterized using small-angle X-ray scattering, transmission electron microscopy (TEM) and nitrogen adsorption. The obtained silicas exhibited two-dimensional hexagonal structures of cylindrical mesopores, and thus can be classified as SBA-15 silicas. In some cases, the size of ordered domains was very small. The (100) interplanar spacings were 13-17 nm, depending on the size of the diblock copolymer used and on the synthesis conditions. Nitrogen adsorption showed that the silicas exhibited specific surface areas of 350-800 m(2) g(-1), pore volumes similar to 1 cm(3) g(-1), and narrow pore size distributions. The BJH (nominal) pore diameters were up to similar to 20 nm, but actual diameters of cylindrical pores are expected to be somewhat smaller. In many cases, the mesopores exhibited constrictions.
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