A new type of sample tube for reducing convection effects in PGSE-NMR measurements of self-diffusion coefficients of liquid samples

Pulsed-Field Gradient NMR Self Diffusion and Ionic Conductivity Measurements for Liquid Electrolytes Containing LiBF4 and Propylene Carbonate

“…A new type of NMR tube has been devised elsewhere [39] to avoid this problem, however here standard NMR tubes were used. Arrhenius plots for the diffusion are shown in figure 3, which involves plotting the natural log of the diffusion values against the inverse of temperature.…”

Improving the accuracy of pulsed field gradient NMR diffusion experiments: Correction for gradient non-uniformity

“…One drastic measure to reduce the effects of non-uniformity is to use either slice selection [4,29,30] or a very short sample [31][32][33] to restrict the signals measured to a small volume over which the field gradient variation is small. Unfortunately both involve a major sacrifice in signal-to-noise ratio, as well as introducing problems where the diffusion distance is not small compared to the slice thickness, and their use is probably best limited to experiments where the analysis method used requires strict adherence to the exponential attenuation as a function of gradient squared seen in Eq.…”

Assessment of diffusion coefficients of general solvents by PFG-NMR: Investigation of the sources error

“…Thus, in order to prevent these effects using normal NMR, we used a Shigemi symmetrical NMR tube which acts as a thermal insulating system and increases both accuracy and reproducibility of the diffusion measurements by reducing the chance of convection in the sample. It consisted of the same or similar magnetic susceptibility matched glass to solvents [51]. Furthermore, we limited the height of the sample to 2 mm for all measurements to reduce the convection effect.…”