Low-cost, pseudo-Halbach dipole magnets for NMR

[Display omitted] •Strong, low-homogeneity magnets constructed using low-cost materials and simple engineering.•Apply in NMR experiments where field strength is a priority over uniformity, e.g. prepolarization.•Demonstrated use of the magnet in zero-field NMR spectroscopy. We present designs for com...

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Bibliographic Details
Published in:Journal of magnetic resonance (1997) 2017-04, Vol.277, p.143-148
Main Authors: Tayler, Michael C.D., Sakellariou, Dimitrios
Format: Article
Language:English
Subjects:
Chemical Sciences
Low-field NMR
Material chemistry
Nuclear magnetic resonance (NMR)
Permanent magnets
Zero-field NMR
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Summary:[Display omitted] •Strong, low-homogeneity magnets constructed using low-cost materials and simple engineering.•Apply in NMR experiments where field strength is a priority over uniformity, e.g. prepolarization.•Demonstrated use of the magnet in zero-field NMR spectroscopy. We present designs for compact, inexpensive and strong dipole permanent magnets aimed primarily at magnetic resonance applications where prepolarization and detection occur at different locations. Low-homogeneity magnets with a 7.5mm bore size and field up to nearly 2T are constructed using low-cost starting materials, standard workshop tools and only few hours of labor – an achievable project for a student or postdoc with spare time. As an application example we show how our magnet was used to polarize the nuclear spins in approximately 1mL of pure [13C]-methanol prior to detection of its high-resolution NMR spectrum at zero field (measurement field below 10-10T), where signals appear at multiples of the carbon-hydrogen spin-spin coupling frequency 1JCH=140.7(1)Hz.
ISSN:1090-7807
1096-0856
DOI:10.1016/j.jmr.2017.03.001