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- W1984143763 abstract "The obtained spectroscopic data for absorption and scattering characteristics of nanoporous silica in the wavelength range from 0.25 to 7 μm are analyzed on the basis of the Mie theory. It is shown that aggregates of primary nanoparticles are responsible for relatively high scattering in the short-wave range from 0.25 to 1.4 μm. But the presence of the aggregates and micron-size cracks in the samples cannot explain unusual behavior of scattering in the long-wave part of the spectral range. The work is focused on understanding of strong scattering peaks observed at exactly the same wavelengths as the infrared absorption peaks of bulk silica: at λ = 2.9, 5.3, and 6.1 μm. The known physical effect of scattering by absorption is considered as a source of these scattering peaks. It means that absorption centers are assumed to be not uniformly distributed in the nanoporous matrix but collected in some micron-size regions. The estimates based on this hypothesis are supported by the fact that near-infrared absorption peaks are produced by silanol groups which may be nonuniformly distributed in the hydroxylated nanoporous silica." @default.
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- W1984143763 date "2010-01-01" @default.
- W1984143763 modified "2023-10-18" @default.
- W1984143763 title "AN EFFECT OF SCATTERING BY ABSORPTION OBSERVED IN THE NEAR-INFRARED PROPERTIES OF NANOPOROUS SILICA" @default.
- W1984143763 doi "https://doi.org/10.1615/ichmt.2010.rad-6.220" @default.
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