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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Zidki, Tomer Meyerstein, Dan Zilbermann, Israel Oster-golberg, Olga Yardeni, Guy Cohen, Haim Bar-ziv, Ronen |
| Description | Author Affiliation: Bar-Ziv R ( Chemistry Dept., Ben-Gurion University of the Negev, Beer-Sheva, Israel.) |
| Abstract | Methyl radicals react in fast reactions, with rate constants $k>1×10^{8} M^{−1} s^{−1},$ with $Au^{0},$ $Ag^{0}$ and $TiO_{2}$ nanoparticles (NPs) dispersed in aqueous solutions to form intermediates, $(NP)(CH_{3})_{n},$ in which the methyl groups are covalently bound to the NPs. These intermediates decompose to form ethane. As n≥2 is required for the formation of $C_{2}H_{6},$ the minimal lifetime (τ) of the methyls bound to the NPs, $(NP)CH_{3},$ can be estimated from the rate of production of the $CH_{3}^{.}$ radicals and the NPs concentration. The results obtained in this study, using a very low dose rate γ-source for $NP=Ag^{0},$ $Au^{0},$ and $TiO_{2}$ point out that τ of these intermediates is surprisingly long, for example, ≥8 and ≥188 sec for silver and gold, respectively. These data point out that the NPC bond dissociation energies are $≥70 kJ mol^{−1}.$ Under low rates of production of $CH_{3}^{.},$ that is, when the rate of formation of ethane is very low, other reactions may occur, consequently the mechanism proposed is “broken”. This is observed in the present study only for $TiO_{2}$ NPs. These results have to be considered whenever alkyl radicals are formed near surfaces. Furthermore, the results point out that the rate of reaction of methyl radicals with $(NP)(CH_{3})_{n}$ depends on n, that is, the number of methyl radicals bound to the NPs affect the properties of the NPs. |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 15 |
| Volume Number | 18 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2012-04-10 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Alkanes Chemistry Metal Nanoparticles Methane Analogs & Derivatives Nanoparticles Molecular Structure Research Support, Non-U.S. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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