Influence of vanillic acid immobilization in Nafion membranes on intramembrane diffusion and structural properties.

ABSTRACT: Pulsed field gradient (PFG) NMR in combination with quasielastic neutron scattering (QENS) was used to investigate self-diffusion of water and acetone in Nafion membranes with and without immobilized vanillic acid (VA). Complementary characterization of these membranes was performed by small angle X-ray scattering (SAXS) and NMR relaxometry. This study was motivated by the recent data showing that an organic acid, such as VA, in Nafion can preserve its catalytic activity in the presence of water even at high intra-polymer water concentrations corresponding up to 100% ambient relative humidity. However, there is currently no clear understanding of how immobilized organic acid molecules influence the microscopic transport properties and related structural properties of Nafion. Microscopic di

SUBMITTER: Trusty B 

PROVIDER: S-EPMC9134266 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature