Thermal diffusivity and nuclear spin relaxation: A continuous wave free precession NMR study

Continuous wave free precession (CWFP) nuclear magnetic resonance is capable of yielding quantitative and easily obtainable information concerning the kinetics of processes that change the relaxation rates of the nuclear spins through the action of some external agent. In the present application, he...

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Bibliographic Details
Published in:Journal of magnetic resonance (1997) 2006-07, Vol.181 (1), p.29-34
Main Authors: Venâncio, Tiago, Engelsberg, Mario, Azeredo, Rodrigo B.V., Colnago, Luiz A.
Format: Article
Language:English
Subjects:
CWFP
Freezing
Natural polymer
SSFP
Thermal diffusivity
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Summary:Continuous wave free precession (CWFP) nuclear magnetic resonance is capable of yielding quantitative and easily obtainable information concerning the kinetics of processes that change the relaxation rates of the nuclear spins through the action of some external agent. In the present application, heat flow from a natural rubber sample to a liquid nitrogen thermal bath caused a large temperature gradient leading to a non-equilibrium temperature distribution. The ensuing local changes in the relaxation rates could be monitored by the decay of the CWFP signals and, from the decays, it was possible to ascertain the prevalence of a diffusive process and to obtain an average value for the thermal diffusivity.
ISSN:1090-7807
1096-0856
DOI:10.1016/j.jmr.2006.03.011