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Ozone Reaction with Carbon Nanostructures 1: Reaction Between Solid C60 and C70 Fullerenes and Ozone

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The exposure of powdered crystals of C60 and C70 fullerenes to ozone with an O3/O2 ratio of 9.7% w/w causes their immediate oxidation. The FT-IR spectroscopy shows the formation of CO2 and the accelerated disappearance of ozone. The infrared spectra of crystalline C60 and C70 powders that were exposed to ozone show absorption bands indicating that oxidation was accompanied by formation of α,β-unsaturated carboxylic groups, aldehyde and other ketonic moieties. The spontaneous decay of O3 in the O3/O2 atmosphere monitored by FT-IR spectroscopy was found to follow a pseudofirst order kinetic law with k 0 = 6.9 × 10−5 S−1. When powdered C60 is present in the system a k C60(1) = 2.0 × 10−4 S−1; k C70(1) = 1.4 × 10−;4 S−1 for C70. The accelerated disappearance of O3is due to its adsorption/reaction with the powdered fullerenes. After about ∼1000 s the reaction enters in a second step wherein the disappearance of O3 slows down significantly due to the lack of further reaction sites on the powdered fullerene surfaces and due to accumulated CO2in the gas phase which exerts an inhibitory effect in the ozone spontaneous decomposition.
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Document Type: Research Article

Publication date: April 1, 2007

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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