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. 2020 Jun 30;21(13):4697. doi: 10.3390/ijms21134697

Figure 5.

Figure 5

(a) 2H NMR spectra recorded during the recovery of the residual quadrupolar splitting νQ after a 90° rotation of a previously equilibrated clay sample; (b) Concentration variations of the limiting equilibrium residual quadrupolar splitting νQ measured at B0 = 2.351 and 8.465 Tesla for the Size2 clay samples and at B0 = 8.465 Tesla for the Size3 clay samples. Additional measurements are performed at B0 = 8.465 Tesla for the Size2 samples in the presence of salt (I = 10−4 M); (c) Determination of the various components of self-diffusion tensor D of the water molecules in the Size2 clay sample (c = 21.5 g/L) measured by the 2H NMR PGSE method at B0 = 2.351 Tesla. The PGSE measurements are performed after equilibration of the clay platelet orientation in the static magnetic field B0 parallel to the e→z director; (d) Concentration variation of the characteristic time tc measured at B0 = 2.351 and 8.465 Tesla for the Size2 clay samples. Reprinted with permission from [49]. Copyright (2010) American Chemical Society.