Dynamics of ethylammonium nitrate near PTFE surface
| Autor: | Andrei Filippov, Oleg I. Gnezdilov, Oleg N. Antzutkin |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Diffusion Biomedical Engineering Biophysics Analytical chemistry NMR tube Ionic Liquids Spectral line Ion Quaternary Ammonium Compounds chemistry.chemical_compound chemistry Ionic liquid Proton NMR Radiology Nuclear Medicine and imaging Ethylammonium nitrate Pulsed field gradient Polytetrafluoroethylene |
| Zdroj: | Magnetic resonance imaging. 85 |
| ISSN: | 1873-5894 |
| Popis: | Self-diffusion of ions in the protic ionic liquid ethylammonium nitrate (EAN) was studied by 1H NMR pulsed field gradient techniques between 294 and 393 K in the presence of a PTFE insert in a 5-mm NMR tube. At all temperatures, the bulk diffusion of ions (measured by 1H and 15N NMR) can be described by a unique diffusion coefficient. The presence of solid hydrophobic surfaces of PTFE induces regions of EAN in their vicinity, where diffusion of ions, both cations and anions, is reduced compared to the bulk values. An additional line-shape analysis in 1H NMR spectra showed that local mobility of ethylammonium cations in the surface layers near PTFE is also reduced. |
| Databáze: | OpenAIRE |
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