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Related Concept Videos

Paramagnetism01:30

Paramagnetism

2.8K
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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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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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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Boosting Magnetoelectric Effect in Polymer-Based Nanocomposites.

Alexander Omelyanchik1,2, Valentina Antipova1, Christina Gritsenko1

  • 1REC Smart Materials and Biomedical Applications, Immanuel Kant Baltic Federal University, 236041 Kaliningrad, Russia.

Nanomaterials (Basel, Switzerland)
|April 30, 2021
PubMed
Summary

Researchers enhanced magnetoelectric composites using nanoparticle alignment and piezoelectric additives. This significantly boosted the magnetoelectric voltage coefficient, showing promise for advanced sensors and bioactive surfaces.

Keywords:
PVDFPVDF-TrFEbarium titanatecobalt ferritemagnetoelectric effectmultiferroicsnanoparticles

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Polymer-based magnetoelectric composites are key for sensors, energy harvesting, and biomedical devices.
  • Current research aims to improve magnetoelectric transformation efficiency.
  • Magnetoelectric materials offer potential for novel applications due to their unique properties.

Purpose of the Study:

  • To enhance the magnetoelectric voltage coefficient (αME) in polymer-based composites.
  • To explore novel strategies for arranging magnetic nanoparticles within polymer matrices.
  • To investigate the impact of multi-component systems on magnetoelectric properties.

Main Methods:

  • Arrangement of magnetic nanoparticle clusters using an external magnetic field in PVDF and PFVD-TrFE matrices.
  • Development of three-component composites incorporating piezoelectric BaTiO3 particles.
  • Characterization of the magnetoelectric voltage coefficient (αME) of the developed composites.

Main Results:

  • Achieved an increase in αME from ~5 mV/cm·Oe (random CoFe2O4 in PVDF) to ~18.5 mV/cm·Oe (magnetic particles in PVDF-TrFE with 5%wt piezoelectric particles).
  • Demonstrated effective nanoparticle alignment strategies for enhanced magnetoelectric performance.
  • Validated the use of three-component systems for superior magnetoelectric coupling.

Conclusions:

  • The proposed strategies significantly enhance the magnetoelectric voltage coefficient in polymer composites.
  • Aligned magnetic nanoparticles and piezoelectric additives are effective for improving magnetoelectric materials.
  • Developed materials show potential for bioactive surface applications, as demonstrated with neural crest stem cell cultures.