Abstract
Pulsed field gradient (PFG) NMR at high magnetic field was used to study microscopic diffusion of dimethyl methyl phosphonate (DMMP), a common chemical warfare agent (CWA) simulant, and water in Nafion membranes. PFG NMR measurements were performed for a broad range of molecular displacements. The self-diffusivities were measured as a function of the DMMP concentration for several fixed water concentrations. The measured data suggest that DMMP and water diffuse in different regions of Nafion. While water mostly diffuses in hydrophilic regions of the membrane, viz. water channels, DMMP diffusion is mostly limited to interfacial perfluoroether regions between these water channels and the semi-crystalline matrix.
| Original language | English |
|---|---|
| Pages (from-to) | 1741-1747 |
| Number of pages | 7 |
| Journal | Chemie-Ingenieur-Technik |
| Volume | 95 |
| Issue number | 11 |
| DOIs | |
| State | Published - Nov 2023 |
| Externally published | Yes |
Funding
This research has been made possible by NSF awards CBET-1836551 and CBET-1836556. A portion of this work was performed in the McKnight Brain Institute at the National High Magnetic Field Laboratory's Advanced Magnetic Resonance Imaging and Spectroscopy (AMRIS) Facility, which is supported by National Science Foundation Cooperative Agreement no. DMR-1644779 and the State of Florida. This work was supported in part by an NIH award, S10RR031637, for magnetic resonance instrumentation. This research has been made possible by NSF awards CBET‐1836551 and CBET‐1836556. A portion of this work was performed in the McKnight Brain Institute at the National High Magnetic Field Laboratory's Advanced Magnetic Resonance Imaging and Spectroscopy (AMRIS) Facility, which is supported by National Science Foundation Cooperative Agreement no. DMR‐1644779 and the State of Florida. This work was supported in part by an NIH award, S10RR031637, for magnetic resonance instrumentation.
Keywords
- Chemical warfare agents
- Diffusion
- Ionomers
- Nafion
- PFG NMR