Magic Angle Gradient (MAG) Coil
For gradient spectroscopy and diffusion
- Ultra-high gradients
- 400 G/cm PFG at 14 T
- Exceptional recovery
- High resolution
- Wide VT range
- Compatible with NB or WB Probes
- Spinning speeds for probes with MAG Coils:
- 22 kHz MAS for 3 mm
- 18 kHz MAS for 4 mm
Results obtained with a Doty 4 mm 1H/19F/X MAS/MAG NMR probe
Directed along the magic angle, a pulsed field gradient of 230 G cm-1 (with 10 Amps) permitted the measurement of a diffusion coefficient for F- using a Doty 4 mm 1H/19F/X MAS/MAG NMR probe (400 MHz 1H) and 19F PGSE magic angle spinning NMR spectroscopy.
The self-diffusion coefficient for F- at 40 oC in a polymeric fluoride ion conductor was measured to be in the 2 10-10 – 4 10-10 m2 s-1 range depending on the type of material.1 One illustrative PGSE decay curve is reported in the Figure to the right/above (recorded with a diffusion time of 30 ms). Overall, the self-diffusion coefficients obtained by NMR spectroscopy were in good agreement with those calculated from impedance spectroscopy data using the Nernst–Einstein equation.
(1) Pasquini L, Ziarelli F, Viel S, Di Vona ML, Knauth P., ChemPhysChem. 2015, 17, 363. Fluoride-ion-conducting Polymers: Ionic Conductivity and Fluoride Ion Diffusion Coefficient in Quaternized Polysulfones.
Special thanks to:
Dr. F. Ziarelli (Aix-Marseille Université, Centrale Marseille, CNRS, Spectropole)
Prof. Dr. S. Viel (Aix-Marseille Université, CNRS, ICR (UMR 7273) & Institut Universitaire de France).
Low-E Inverse-Detected MAS-MAG Applications