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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
779

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Related Experiment Video

Updated: Sep 25, 2025

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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Parallel Multichannel Assessment of Rotationally Manipulated Magnetic Nanoparticles.

Syed I Hussain1,2,3, Lamar O Mair4, Alexander J Willis5

  • 1Department of Neurosurgery, The University of Illinois at Chicago, Chicago, IL, USA.

Nanotechnology, Science and Applications
|April 26, 2022
PubMed
Summary
This summary is machine-generated.

Magnetic nanoparticles (MNPs) can be propelled by rotating magnetic fields for drug delivery. Nickel nanorods demonstrated optimal performance, effectively dispersing doxorubicin over 10.5 cm in under 30 seconds.

Keywords:
doxorubicindrug deliveryelectromagnetic fieldmagnetic drug targetingnanoparticle assayrotating fields

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Materials Science

Background:

  • Rotational manipulation of magnetic nanoparticles (MNPs) shows promise for targeted drug delivery.
  • Clinical applications require comparative studies of different MNP types for velocity, range, and drug carrying capacity.

Purpose of the Study:

  • To design and test an electric device for simultaneous, multichannel MNP evaluation using rotating magnetic fields.
  • To identify the optimal MNP for drug transport and demonstrate its efficacy with unbound therapeutic agents.

Main Methods:

  • A magnetomotive system with a three-coil electromagnetic setup and multichannel acrylic tray was constructed.
  • Five distinct MNPs were tested, measuring velocities under varying magnetic field frequencies (5-200 Hz) and heights (0-18 cm).
  • Doxorubicin was used as the therapeutic agent to assess drug dispersion capabilities.

Main Results:

  • The system achieved maximum MNP velocities of 0.9 cm/s, with a critical frequency observed at 20-30 Hz for all tested MNPs.
  • Nickel nanorods exhibited the best response relative to tray height.
  • Nickel nanorods successfully dispersed unbound doxorubicin over 10.5 cm in less than 30 seconds.

Conclusions:

  • A three-coil electromagnetic device can generate rotating magnetic fields for MNP manipulation over mesoscale distances.
  • Multichannel trays facilitate side-by-side comparison of MNPs for drug delivery suitability.
  • These findings highlight the potential of MNPs for future in vivo drug delivery applications.