2H nuclear magnetic resonance study of supercooled toluene: Slow and fast processes above and below the glass transition
- Publication type:
- Journal article
- Metadata:
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- Abstract
- <jats:p>2H-NMR spin-lattice relaxation times T1 of phenyl ring deuterated toluene have been measured as a function of temperature (75–290 K) at Larmor frequencies between 13.8 and 55.8 MHz. The results are interpreted by assuming a Cole–Davidson rotational correlation time distribution for the α process dominating T1 at temperatures down to about 20 K above the glass transition (Tg=117 K) and one further process at lower temperatures. The latter is analyzed below Tg using a model with temperature dependent librational angles ΔΦ&lt;13° and mean correlation times τ≳10−9 s. Self-diffusion coefficients are determined at temperatures down to 136 K (D=1.5×10−14 m2 s−1) using a static field gradient 1H-NMR method. The product of D and the mean rotational correlation time shows a tendency to increase at the lowest temperatures.</jats:p>
- Autoren
- G Hinze
- H Sillescu
- DOI
- 10.1063/1.470902
- eISSN
- 1089-7690
- ISSN
- 0021-9606
- Ausgabe der Veröffentlichung
- 1
- Zeitschrift
- The Journal of Chemical Physics
- Sprache
- en
- Paginierung
- 314 - 319
- Datum der Veröffentlichung
- 1996
- Status
- Published
- Herausgeber
- AIP Publishing
- Herausgeber URL
- http://dx.doi.org/10.1063/1.470902
- Datum der Datenerfassung
- 2024
- Titel
- 2H nuclear magnetic resonance study of supercooled toluene: Slow and fast processes above and below the glass transition
- Ausgabe der Zeitschrift
- 104
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