Cs-133 Nuclear Magnetic Resonance Relaxometry as a Probe of the Mobility of Cesium Cations Confined within Dense Clay Sediments
P Porion and F Warmont and AM Faugere and AL Rollet and E Dubois and V Marry and LJ Michot and A Delville, JOURNAL OF PHYSICAL CHEMISTRY C, 119, 15360-15372 (2015).
Cs-133 nuclear magnetic resonance is used to quantify the mobility of cesium counterions confined within the interlamellar space of synthetic Hectorite clay under controlled hydration conditions. The degree of lamellae ordering within the macroscopic clay sediment is determined by analyzing the variation of the Cs-133 NMR spectra as a function of the sample orientation in the static magnetic field. Furthermore, a detailed analysis of the Cs-133 NMR spectra allows one to determine the order of magnitude of the quadrupolar and heteronuclear dipolar couplings monitoring the NMR. relaxation of the cesium cations confined within clay sediments. Finally, a lower limit to the average residence time of the cesium cations within the clay interlamellar space is determined by using 133Cs NMR relaxation measurements under spin-locking conditions.
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