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

Journal of Magnetic Resonance
Tiago VenâncioLuiz Alberto Colnago

Abstract

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.

References

Jun 1, 1991·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·C E CarneyS Patz
Jan 1, 1987·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·R C Hawkes, S Patz
Jun 17, 2000·Analytical Chemistry· Bagueira de Vasconcelos AzeredM Engelsberg
Jul 20, 2001·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·R B de Vasconcellos AzeredoL A Colnago

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