Abstract
| Lingua originale | English |
|---|---|
| pagine (da-a) | 9-12 |
| Numero di pagine | 4 |
| Rivista | Journal of Non-Crystalline Solids |
| Volume | 361 |
| Stato di pubblicazione | Published - 2013 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Materials Chemistry
- Condensed Matter Physics
- Ceramics and Composites
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Properties of methyl radical trapped in amorphous SiO2 and in natural SiO2-clathrate Melanoflogite. / Boscaino, Roberto; Gelardi, Franco Mario; Agnello, Simonpietro; Buscarino, Gianpiero.
In: Journal of Non-Crystalline Solids, Vol. 361, 2013, pag. 9-12.Risultato della ricerca: Article
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TY - JOUR
T1 - Properties of methyl radical trapped in amorphous SiO2 and in natural SiO2-clathrate Melanoflogite
AU - Boscaino, Roberto
AU - Gelardi, Franco Mario
AU - Agnello, Simonpietro
AU - Buscarino, Gianpiero
PY - 2013
Y1 - 2013
N2 - We report an experimental investigation by electron paramagnetic resonance (EPR) on methyl radical (CH3 • ) observed in γ-ray irradiated high-purity amorphous silicon dioxide (a-SiO2) and in a polycrystalline sample of Melanophlogite, a rare natural form of SiO2-clathrate. From the analysis of the EPR spectra we estimate the correlation time of the hindered rotational motion of CH3 • molecules at T=77 K in the two different materials. This physical quantity gives a quantitative measure of the freedom of motion of CH3 • molecules trapped in the two solid systems, putting forward relevant information on the properties of the cavities/interstices inwhich the radicals are confined. In particular, our data suggest that in a-SiO2 the CH3 • molecules are trapped in interstices with diameter significantly lower than about 5.7 Å, which is the size of the smaller cavity involved in the crystalline structure of Melanophlogite.
AB - We report an experimental investigation by electron paramagnetic resonance (EPR) on methyl radical (CH3 • ) observed in γ-ray irradiated high-purity amorphous silicon dioxide (a-SiO2) and in a polycrystalline sample of Melanophlogite, a rare natural form of SiO2-clathrate. From the analysis of the EPR spectra we estimate the correlation time of the hindered rotational motion of CH3 • molecules at T=77 K in the two different materials. This physical quantity gives a quantitative measure of the freedom of motion of CH3 • molecules trapped in the two solid systems, putting forward relevant information on the properties of the cavities/interstices inwhich the radicals are confined. In particular, our data suggest that in a-SiO2 the CH3 • molecules are trapped in interstices with diameter significantly lower than about 5.7 Å, which is the size of the smaller cavity involved in the crystalline structure of Melanophlogite.
KW - Methyl radical; Electron paramagnetic resonance; Radiation effects; Clathrate; Silica
UR - http://hdl.handle.net/10447/70563
M3 - Article
VL - 361
SP - 9
EP - 12
JO - Journal of Non-Crystalline Solids
JF - Journal of Non-Crystalline Solids
SN - 0022-3093
ER -