Microstructure of porous media and field‐cycling nuclear magnetic relaxation spectroscopy

1994 ◽  
Vol 75 (1) ◽  
pp. 529-537 ◽  
Author(s):  
S. Stapf ◽  
R. Kimmich ◽  
J. Niess
Keyword(s):  
Porous Media ◽  
Magnetic Relaxation ◽  
Nuclear Magnetic Relaxation ◽  
Field Cycling ◽  
Nuclear Magnetic

Applying Fast-Field Cycling Nuclear Magnetic Relaxation to Petroleum Tight Sandstone Rocks

2019 ◽  
Vol 33 (2) ◽  
pp. 1016-1022 ◽  
Author(s):  
Bing Zhou ◽  
Peiqiang Yang ◽  
Gianni Ferrante ◽  
Moreno Pasin ◽  
Rebecca Steele ◽  
...  
Keyword(s):  
Magnetic Relaxation ◽  
Nuclear Magnetic Relaxation ◽  
Tight Sandstone ◽  
Field Cycling ◽  
Fast Field ◽  
Nuclear Magnetic

scholarly journals Fast-field-cycling ultralow-field nuclear magnetic relaxation dispersion

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Sven Bodenstedt ◽  
Morgan W. Mitchell ◽  
Michael C. D. Tayler
Keyword(s):  
High Resolution ◽  
Magnetic Relaxation ◽  
Magnetic Measurements ◽  
Nuclear Magnetic Relaxation ◽  
Relaxation Dispersion ◽  
Relaxation Rates ◽  
Field Range ◽  
Field Cycling ◽  
Fast Field ◽  
Nuclear Magnetic

AbstractOptically pumped magnetometers (OPMs) based on alkali-atom vapors are ultra-sensitive devices for dc and low-frequency ac magnetic measurements. Here, in combination with fast-field-cycling hardware and high-resolution spectroscopic detection, we demonstrate applicability of OPMs in quantifying nuclear magnetic relaxation phenomena. Relaxation rate dispersion across the nT to mT field range enables quantitative investigation of extremely slow molecular motion correlations in the liquid state, with time constants > 1 ms, and insight into the corresponding relaxation mechanisms. The 10-20 fT/$$\sqrt{{\rm{H}}}{\rm{z}}$$ H z sensitivity of an OPM between 10 Hz and 5.5 kHz 1H Larmor frequency suffices to detect magnetic resonance signals from ~ 0.1 mL liquid volumes imbibed in simple mesoporous materials, or inside metal tubing, following nuclear spin prepolarization adjacent to the OPM. High-resolution spectroscopic detection can resolve inter-nucleus spin-spin couplings, further widening the scope of application to chemical systems. Expected limits of the technique regarding measurement of relaxation rates above 100 s−1 are discussed.

Nuclear magnetic relaxation in porous media: The role of the mean lifetime τ(ρ,D)

1991 ◽  
Vol 44 (10) ◽  
pp. 4960-4973 ◽  
Author(s):  
David J. Wilkinson ◽  
David Linton Johnson ◽  
Lawrence M. Schwartz
Keyword(s):  
Porous Media ◽  
Magnetic Relaxation ◽  
Nuclear Magnetic Relaxation ◽  
Mean Lifetime ◽  
The Mean ◽  
Nuclear Magnetic
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