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- W2063730055 abstract "Diffraction intensity analysis of small-angle neutron scattering measurements of dry SBA-15 have been combined with nonlocal density functional theory (NLDFT) analysis of nitrogen desorption isotherms to characterize the micropore, secondary mesopore, and primary mesopore structure. The radial dependence of the scattering length density, which is sensitive to isolated surface hydroxyls, can only be modeled if the NLDFT pore size distribution is distributed relatively uniformly throughout the silica framework, not localized in a “corona” around the primary mesopores. Contrast matching-small angle neutron scattering (CM-SANS) measurements, using water, decane, tributylamine, cyclohexane, and isooctane as direct probes of the size of micropores indicate that the smallest pores in SBA-15 have diameter between 5.7 and 6.2 Å. Correlation of the minimum pore size with the onset of the micropore size distribution provides direct evidence that the shape of the smallest micropores is cylinderlike, which is consistent with their being due to unraveling of the polymer template." @default.
- W2063730055 created "2016-06-24" @default.
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- W2063730055 date "2011-08-19" @default.
- W2063730055 modified "2023-10-16" @default.
- W2063730055 title "Size and Spatial Distribution of Micropores in SBA-15 using CM-SANS" @default.
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- W2063730055 doi "https://doi.org/10.1021/cm200707y" @default.
- W2063730055 hasPublicationYear "2011" @default.
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