Adsorption characterization of surfactant-templated ordered mesoporous silicas synthesized with and without hydrothermal treatment |
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Authors: | Jerzy Choma Mietek Jaroniec |
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Institution: | a Department of Chemistry, Kent State University, Kent, OH 44242, USA b Institute of Chemistry, Military Technical Academy, 00-908 Warsaw, Poland c Department of Crystallography, M. Curie-Sk?odowska University, 20031 Lublin, Poland |
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Abstract: | This work reports a systematic study of ordered mesoporous silicas (OMSs) synthesized with and without hydrothermal treatment at 373 K for a series of surfactants of different alkyl chain length (from C10 to C18). For these samples nitrogen adsorption and small angle X-ray scattering (SAXS) data were measured to characterize their adsorption and surface properties. Namely, nitrogen adsorption isotherms were used to evaluate their specific surface area, pore volume and pore size distribution, whereas SAXS data provided information about their structural ordering. It is shown that while the room temperature synthesis afforded OMS samples with cubic MCM-48 structure, an additional 5-day hydrothermal treatment of these samples at 373 K caused their transformation to MCM-41 (two-dimensional hexagonal structure) and improved their pore uniformity, which was manifested by reducing the width of pore size distribution. |
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Keywords: | Small angle X-ray scattering Ordered mesoporous silicas Nitrogen adsorption isotherms |
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