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- W2077999281 abstract "Transparent, flexible, and luminescent Eu3+-doped siloxane−poly(ethylene glycol) (PEG) nanocomposites have been obtained by the sol−gel process. The inorganic (siloxane) and organic PEG phases are usually linked by weak bonds (hydrogen bonds or van der Waals forces), and small-angle X-ray scattering (SAXS) measurements suggest that the structure of these materials consists of fractal siloxane aggregates embedded in the PEG matrix. For low Eu3+ contents, n = 300 and n = 80, the aggregates are small and isolated and their fractal dimensions are 2.1 and 1.7, respectively. These values are close to those expected for gelation mechanisms consisting of reaction-limited cluster−cluster aggregation (RLCCA) and diffusion-limited cluster−cluster aggregation (DLCCA). For high Eu3+ content, SAXS results are consistent with a two-level structure: a primary level of siloxane aggregates and a second level, much larger, formed by the coalescence of the primary ones. The observed increase in the glass transition temperature for increasing Eu3+ content is consistent with the structural model derived from SAXS measurements. Extended X-ray absorption fine structure (EXAFS) and luminescence spectroscopy measurements indicate that under the experimental conditions utilized here Eu3+ ions do not strongly interact with the polymeric phase." @default.
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- W2077999281 date "2001-08-30" @default.
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- W2077999281 title "Structure and Luminescence of Eu<sup>3+</sup>-Doped Class I Siloxane−Poly(ethylene glycol) Hybrids" @default.
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- W2077999281 doi "https://doi.org/10.1021/cm0012320" @default.
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