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Colors and Magnetism

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.

Diamagnetism

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.

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Cell Labeling and Targeting with Superparamagnetic Iron Oxide Nanoparticles

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Published on: October 19, 2015

Lanthanide(III)-doped magnetite nanoparticles.

Channa R De Silva¹, Steve Smith, Inbo Shim

¹Department of Chemistry, University of Arizona, Tucson, Arizona 85721, USA.

Journal of the American Chemical Society

|April 17, 2009

Summary

This summary is machine-generated.

Lanthanide-doped magnetite nanoparticles synthesized via thermal decomposition exhibit unique room-temperature ferromagnetism. This behavior differs significantly from undoped magnetite and nanoparticles made by coprecipitation.

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Area of Science:

Materials Science
Nanotechnology
Solid State Physics

Background:

Magnetite nanoparticles are widely studied for their magnetic properties.
Controlling nanoparticle synthesis is crucial for tuning magnetic behavior.
Lanthanide doping offers a route to modify magnetic characteristics.

Purpose of the Study:

To synthesize nearly monodisperse lanthanide-doped magnetite nanoparticles.
To investigate the magnetic properties of these novel nanoparticles.
To compare their magnetic behavior with undoped and coprecipitated counterparts.

Main Methods:

Thermal decomposition of metal acetylacetonate precursors (Fe(acac)3 and Ln(acac)3) in the presence of surfactants.
Lanthanide doping with samarium (Sm), europium (Eu), and gadolinium (Gd).
Magnetic property characterization, including measurements at room temperature.

Main Results:

Successful synthesis of nearly monodisperse lanthanide-doped magnetite nanoparticles.
Observation of room-temperature ferromagnetic behavior in the doped nanoparticles.
Demonstration of distinct magnetic properties compared to undoped magnetite and coprecipitated nanoparticles.

Conclusions:

Thermal decomposition is an effective method for producing monodisperse lanthanide-doped magnetite nanoparticles.
Lanthanide doping significantly alters the magnetic properties of magnetite nanoparticles.
The observed ferromagnetism presents opportunities for advanced magnetic applications.