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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
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A solenoid is a conducting wire coated with an insulating material, wound tightly in the form of a helical coil. The magnetic field due to a solenoid is the vector sum of the magnetic fields due to its individual turns. Therefore, for an ideal solenoid, the magnetic field within the solenoid is directly proportional to the number of turns per unit length and the current. Conversely, the magnetic field outside the solenoid is zero.
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If a magnetic field is sustained, there must be a current in a closed circuit or loop, implying some energy has been spent in creating the field. If this energy is not dissipated via the circuit's resistance, it is stored in the field.
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Electropermanent magnets for variable-field NMR.

Chad Ropp1, Cheng Chen2, Mason Greer2

  • 1Weinberg Medical Physics, 12156 Parklawn Dr, Rockville, MD 20852, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|April 27, 2019
PubMed
Summary
This summary is machine-generated.

A novel variable-field Nuclear Magnetic Resonance (NMR) system uses tunable magnetic fields to differentiate dairy products. This low-cost technique analyzes proton relaxation, offering new possibilities for magnetic resonance imaging.

Keywords:
dispersionBroadbandElectropermanent magnetVariable field NMR

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Area of Science:

  • Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Materials Science
  • Food Science

Background:

  • Traditional Nuclear Magnetic Resonance (NMR) often requires fixed magnetic fields or complex field-cycling systems.
  • Understanding molecular dynamics through magnetic field dependence is crucial for material characterization.
  • Differentiating complex biological matrices like dairy products requires sensitive analytical techniques.

Purpose of the Study:

  • To develop and demonstrate a dynamically tunable B0 field system for variable-field NMR.
  • To assess the feasibility of this system for discriminating between different dairy products.
  • To explore the potential of variable-field NMR for novel magnetic resonance imaging applications.

Main Methods:

  • Utilized an array of electropermanent AlNiCo-5 magnets with individually programmed magnetizations via pulse-power control to create a tunable B0 field.
  • Employed an ultra-broadband front-end for efficient power transmission across a wide frequency range, eliminating the need for probe tuning.
  • Conducted T1-T2 correlation measurements at variable B0 field strengths (0.5-2 MHz) to analyze proton spin-lattice relaxation.

Main Results:

  • Successfully demonstrated the capability to vary the magnetic field strength for field-dispersion measurements.
  • Achieved discrimination between different dairy products based on their T1-T2 correlation spectra.
  • Observed variations in the frequency dependence of proton spin-lattice relaxation, correlated with the degree of protein hydration in the dairy products.

Conclusions:

  • The developed dynamically tunable B0 field NMR system offers a low-cost alternative to fast field-cycling NMR.
  • This technique effectively differentiates dairy products by analyzing field-dependent relaxation properties.
  • The approach holds promise for advancing contrast mechanisms and spatial encoding in magnetic resonance imaging.