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- W2329338066 abstract "The behavior of different nanoporous grafted silicas (−Si(CH3)2R) under ionizing radiation is investigated as a function of the chemical nature of the grafting. The structure and reactivity of the grafting after irradiation is characterized by solid-state NMR spectroscopy. The chemical reactivity is also investigated by mass spectrometry gas analysis . The major gases detected after irradiation are H2 and/or CH4. Different types of behaviors under ionizing radiation are depicted as a function of R. When R contains an aromatic ring or is the cyclopentadienyl moiety, then the overall measured radiolytic yields are low and CH4 is the major gas detected. The aromatic ring acts as an efficient energy trap. When R contains an alkyl chain with a −CN ending, the major gas detected is dihydrogen due to the lysis of the −CH(H) bond, but it is also shown that the −CN group acts as an energy trap, even if it is of course less efficient than an aromatic ring. When R consists of a long alkyl chain, an efficient energy transfer occurs at the interface and leads to a significant H2 production due to the lysis of the −CH(H)– bond. Lastly, when R is small (a methyl or an ethyl group), the situation is different and the Si–C bond is preferentially cleaved over the C–H bond." @default.
- W2329338066 created "2016-06-24" @default.
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- W2329338066 date "2013-10-24" @default.
- W2329338066 modified "2023-10-13" @default.
- W2329338066 title "Influence of the Nature of Self-Assembled Monolayers on Their Reactivity under Ionizing Radiation: A Solid-State NMR Study" @default.
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- W2329338066 doi "https://doi.org/10.1021/jp4056335" @default.
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