NMR relaxation in porous materials at zero and ultralow magnetic fields

• Published in: Journal of magnetic resonance (1997) 2018-12, Vol.297, p.1-8
• Main Authors: Tayler, Michael C.D., Ward-Williams, Jordan, Gladden, Lynn F.
• Format: Article
• Language: English
• Subjects: Fast field cycling; Nuclear magnetic resonance (NMR) relaxation; Porous materials; Zero-field NMR
• ISSN: 1090-7807; 1096-0856
• DOI: 10.1016/j.jmr.2018.09.014

[Display omitted] •NMR spectroscopy and relaxation measurements for liquids imbibed into porous silica, in the field range nT to mT.•High-resolution NMR of specific chemicals in the porous medium via zero-field NMR.•Comparison between ultralow-field instrument and commercial fast-field cycling NMR relaxometry instrument. NMR detection in the ultralow-field regime (below 10 μT) was used to measure the nuclear spin relaxation rates of liquids imbibed into silica pellets with mean pore diameters in the 10–50 nm range. Heptane, formic acid and acetic acid were studied and relaxation rate data were compared with a conventional field-cycling NMR technique. Detection of 1H-13C spin coupling NMR signals at zero field (∼0.1 nT) allowed spectroscopic identification of molecules inside the porous material and unambiguous measurements of the chemistry-specific relaxation rates in liquid mixtures. In the case of molecules that contain 1H and 13C, spin-singlet state relaxation can provide additional information about the dynamics. Applications and future improvements to the methodology are discussed.