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- W2000255254 abstract "The dehydroxylation behavior of two MCM-41 samples with and without C60 was monitored by infrared spectroscopy. Both samples contain isolated and hydrogen-bonded silanol groups, but with different distributions. Without C60, the hydrogen-bonded species are eliminated at elevated temperatures under vacuum whereas the isolated ones remain. Loading C60 in the MCM-41 materials greatly changes their dehydroxylation behavior. When the MCM-41:C60 weight ratio is 10:1, at about 400 °C under vacuum, the isolated silanols are reduced to a certain degree whereas the hydrogen-bonded hydroxyls become more resistant to thermal treatment by comparison with those in the parent C60-free samples. Increasing the loading amount of C60 to a MCM-41:C60 weight ratio of 10:3 results in complete removal of both isolated and hydrogen-bonded silanols, at about 350 °C. However, the two MCM-41 samples exhibit different infrared spectra at lower evacuation temperatures in the presence of C60, indicative of a discrepancy in the dehydroxylation process between them. It is postulated that during the dehydroxylation, C60 captures hydroxyls from the silanol groups of MCM-41 to form C−H and C−OH species, followed by condensation of the C−OH groups and/or combination of C−OH with C−H." @default.
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- W2000255254 date "1997-04-01" @default.
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- W2000255254 title "Infrared Study on the Dehydroxylation of C60-Loaded MCM-41" @default.
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- W2000255254 doi "https://doi.org/10.1021/la960502j" @default.
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