New generation diffusion probe

  • Summary

NM200012E

The new generation diffusion probe is a probe specialized for diffusion applications which requires a large magnetic field gradient. By improving the design around the coil, the recovery time after the field gradient pulse has been significantly shortened compared to the conventional model. This probe is best for analyses of dynamics of high molecular weight polymer solutions with a small diffusion coefficient, nuclei with a small gyromagnetic ratio, and ions in solid electrolytes, which have been actively developed in recent years.

高勾配磁場印加プローブ
Specification
Maximum magnetic field gradient 1200G/cm @ 30A
2000G/cm @ 50A
Sample tube diameter 5 mm
Available Nuclei 1H, 19F, 31P~7Li, 11B~17O,15N
NMR lock 2H
FG polarization Bipolar
VT range -70~120°C
Auto Tune Available

Analytical example 1
Li ion dynamics in polymer solid electrolytes.

The diffusion behavior of Li ions changes significantly depending on the difference in the higher-order structure of the polymer electrolyte.
From the diffusion time (Δ) dependence of the diffusion plot, the uniformity of the diffusion motion can be investigated.

Method: 7Li Stimulated Echo
Sample: Polyketone solid electrolyte (crystalline, amorphous)

Amorphous
Stejskal-Tanner diffusion plot with various diffusion time
Stejskal-Tanner diffusion plot with various diffusion time
No diffusion time dependence
→ Homogeneous diffusion

Diffusion time coefficient (Δ=500ms)
DLi = 5.6 × 10-11 [m2/s]
Crystalline
Stejskal-Tanner diffusion plot with various diffusion time
Stejskal-Tanner diffusion plot with various diffusion time
Diffusion time dependence
→Restricted diffusion
Diffusion time coefficient (Δ=500ms)
DLi = 0.4 × 10-11 [m2/s]

Yoshino et al. JEOL NEWS vol.38
Courtesy of Asahi Kasei Corporation

Analytical example 2
Li ion dynamics in inorganic oxide solid electrolytes.

It is also possible to analyze the diffusion behavior of Li ions in inorganic solid electrolytes with a small diffusion coefficient. The activation energy of diffusion motion can be calculated from the temperature dependence of the diffusion coefficient.

Method: 7Li Stimulated Echo
Sample: LLTZO (Single Crystal, Powder)

Stejskal-Tanner diffusion plot at various temperatures.
Stejskal-Tanner diffusion plot at various temperatures.
Activation energy of diffusion motion.
Activation energy of diffusion motion.
(An Arrhenius plot of diffusion coefficient)

Courtesy of Dr. Naoaki Kuwata (NIMS)
Dr. Junji Akimoto (AIST)

Please see the PDF file for the additional information.
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