Low-field single-sided NMR for one-shot 1D-mapping: Application to membranes

Many single-sided permanent magnet NMR systems have been proposed over the years allowing for 1D proton-density profiling, diffusion measurements and relaxometry. In this manuscript we make use of a recently published unilateral magnet for low-field NMR exhibiting an extremely uniform magnetic field gradient with moderate strength and cylindrical symmetry, allowing for a well-defined sweet spot. Combined with a goniometer, our system is used to characterize precisely the uniformity of its gradient and to achieve micrometric precision 1D profiling, as well as spatially localized relaxometry and diffusometry on thick (similar to 150 pm) membrane samples. Profiling with this magnet did not require repositioning of the samples with respect to the 1D tomograph. (C) 2017 Elsevier Inc. All rights reserved.