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Related Concept Videos

Ferromagnetism01:31

Ferromagnetism

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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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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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Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

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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,...
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Updated: Feb 17, 2026

Manganese Oxide Nanoparticle Synthesis by Thermal Decomposition of ManganeseII Acetylacetonate
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Printable and Antiferromagnetic Mn(OH)2@Te-O Core-Shell Nanosheets.

Fang Yuan1, Jiaze Xie1, Ratnadwip Singha2

  • 1Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States.

Chemistry of Materials : a Publication of the American Chemical Society
|February 16, 2026
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Summary

Researchers developed a one-step method to create core-shell nanosheets from air-sensitive materials. This novel process yields stable, functional magnetic and electronic nanosheets for various applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Core-shell nanomaterials offer tunable properties and integrated functionalities.
  • Synthesizing core-shell nanosheets is challenging due to control over growth and interfaces.
  • Air-sensitive compounds complicate nanomaterial fabrication.

Purpose of the Study:

  • To develop a facile, one-step method for producing core-shell nanosheets.
  • To synthesize core-shell nanosheets from the air-sensitive Li1+xMnTe2.
  • To characterize the structure, stability, and properties of the resulting nanosheets.

Main Methods:

  • One-step chemical exfoliation via sonication in water.
  • Characterization using Powder X-ray Diffraction (PXRD), SEM-EDX, ICP-OES, and TEM.
  • Magnetic and electrical transport measurements.

Main Results:

  • Formation of few-layer crystalline Mn-(OH)2 cores encapsulated by amorphous Te-O shells.
  • Stable nanosheet suspension in air for over 31 days.
  • Antiferromagnetic ordering observed in restacked nanosheets.
  • Uniform film deposition on various substrates with room temperature resistance in the megaohm range.

Conclusions:

  • Chemical exfoliation is an effective approach for creating core-shell nanosheets.
  • The synthesized nanosheets possess both magnetic and electronic functionalities.
  • This method simplifies the production of complex nanomaterials from sensitive precursors.