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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Ferromagnetism01:31

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Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
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Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

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Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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π Electron Effects on Chemical Shift: Overview01:27

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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0,...
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)01:15

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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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Diamagnetism01:26

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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High-resolution microtesla in-situ<sup>13</sup>C NMR detection of "scaled-up" SABRE-hyperpolarization of [1-<sup>13</sup>C]pyruvate.

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LIGHT-SABRE enables efficient in-magnet catalytic hyperpolarization.

Thomas Theis1, Milton Truong2, Aaron M Coffey2

  • 1Department of Chemistry, Duke University, 124 Science Drive, Durham, NC 27708, USA.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 10, 2014
PubMed
Summary

Nuclear spin hyperpolarization using signal amplification by reversible exchange (SABRE) is improved by the new LIGHT-SABRE method. This technique reduces cost and complexity for generating hyperpolarized molecules for NMR and MRI applications.

Keywords:
HyperpolarizationMagnetic propertiesNMR and MRINMR spectroscopyParahydrogen

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Area of Science:

  • Magnetic Resonance Imaging
  • Nuclear Magnetic Resonance Spectroscopy
  • Catalysis

Background:

  • Nuclear spin hyperpolarization enhances NMR and MRI sensitivity.
  • Traditional dynamic nuclear polarization (DNP) faces scalability, cost, and apparatus challenges.
  • Signal amplification by reversible exchange (SABRE) offers an alternative but requires specific conditions.

Purpose of the Study:

  • To develop a more accessible and versatile hyperpolarization method.
  • To overcome the limitations of existing SABRE techniques.
  • To enable hyperpolarization under simpler and more general conditions.

Main Methods:

  • Demonstration of "Low-Irradiation Generation of High Tesla-SABRE" (LIGHT-SABRE).
  • Utilizes simple pulse sequences and low radiofrequency (RF) power deposition.
  • Works with parahydrogen and transition metal catalysts for hyperpolarization.

Main Results:

  • LIGHT-SABRE successfully hyperpolarizes substrates with low power deposition.
  • The method does not require sample transfer to low magnetic fields.
  • Applicable across various magnetic fields and for multiple nuclei.

Conclusions:

  • LIGHT-SABRE significantly simplifies the process of producing hyperpolarized molecules.
  • This approach has the potential to reduce the cost and complexity of hyperpolarization technologies.
  • Enables broader application of hyperpolarized NMR and MRI.