A Simple Elimination of the Thermal Convection Effect in NMR Diffusiometry Experiments.

ABSTRACT: Thermal convection is always present when the temperature of an NMR experiment is different from the ambient one. Most often, it falsifies the value of the diffusion coefficient determined by NMR diffusiometry using a PGSE NMR experiment. In spite of common belief, it acts not only at higher temperatures but also at temperatures lower than in the laboratory. Sodium alkyl-sulfate monomers and micelles in D₂O solvent were used as model molecules measured at T = 319 K in order to show that thermal convection sometimes remains hidden in experiments. In this paper, we demonstrate that the increase in apparent diffusion coefficient with increasing diffusion time is a definite indicator of thermal convection. Extrapolation to zero diffusion time can also be used to obtain the real diff

SUBMITTER: Nyul D 

PROVIDER: S-EPMC9573581 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature