Long-Time Dynamics of
Confined Water Molecules Probed by <sup>2</sup>H NMR Multiquanta Relaxometry:
An Application to Dense Clay Sediments
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Abstract
The structural and dynamical properties of water molecules
confined within dense clay sediment are investigated by <sup>2</sup>H NMR spectroscopy and multiquanta relaxometry. The relative contribution
of both quadrupolar and paramagnetic NMR relaxation mechanisms is
evaluated by carefully analyzing the variation of <sup>2</sup>H multiquanta
NMR relaxation rates as a function of the orientation of the clay
sediment within the static magnetic field. The same analysis is successfully
applied to <sup>2</sup>H multiquanta NMR spin-locking relaxation measurements,
significantly increasing the probed dynamical range. That procedure
leads to an accurate determination of the average residence time of
the water molecule confined within the interlamellar space of the
clay lamellae