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Related Concept Videos

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
Ferromagnetism01:31

Ferromagnetism

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...
Diamagnetism01:26

Diamagnetism

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.
Paramagnetism01:30

Paramagnetism

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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Related Experiment Video

Updated: Jul 3, 2026

Biofunctionalization of Magnetic Nanomaterials
06:40

Biofunctionalization of Magnetic Nanomaterials

Published on: July 16, 2020

Magnetic nanoparticles with core/shell structures.

W Liu1, W Zhong, Y W Du

  • 1College of Science, South China Agriculture University, Guangzhou 510642, PR China.

Journal of Nanoscience and Nanotechnology
|August 7, 2008
PubMed
Summary
This summary is machine-generated.

This review covers advances in core/shell magnetic nanoparticles, highlighting their unique properties and diverse applications. These functional materials offer tailored magnetic characteristics for novel uses.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Core/shell magnetic nanoparticles are functional materials with unique magnetic properties.
  • Tailored dimensions and compositions enable control over material characteristics.
  • These nanoparticles are crucial for developing advanced technological applications.

Purpose of the Study:

  • To review recent advances in the preparation and characterization of core/shell magnetic nanoparticles.
  • To present unique properties and self-assembly behaviors of these materials.
  • To demonstrate the integration of synthesis, characterization, and applications.

Main Methods:

  • Focus on core/shell structures with nonmagnetic, antiferromagnetic, or ferro/ferri-magnetic shells.
  • Characterization of microstructural evolution and control.
  • Exploration of unique properties and self-assembly.

Main Results:

  • Shell layers serve diverse and critical functions in core/shell magnetic nanoparticles.
  • Successful synthesis and characterization of various core/shell magnetic structures.
  • Demonstration of novel applications arising from tailored magnetic properties.

Conclusions:

  • Core/shell magnetic nanoparticles represent a significant advancement in functional materials.
  • The controlled synthesis and understanding of these materials unlock new physical phenomena.
  • These nanoparticles offer a broad spectrum of novel applications across various fields.