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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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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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In Vitro and In Vivo Delivery of Magnetic Nanoparticle Hyperthermia Using a Custom-Built Delivery System
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Engineering Core-Shell Structures of Magnetic Ferrite Nanoparticles for High Hyperthermia Performance.

Mohamed S A Darwish1,2, Hohyeon Kim1, Hwangjae Lee3

  • 1School of Integrated Technology, Gwangju Institute of Science and Technology, Gwangju 61005, Korea.

Nanomaterials (Basel, Switzerland)
|May 28, 2020
PubMed
Summary

Magnetic ferrite nanoparticles (MFNs) with enhanced specific loss power (SLP) were developed using core-shell structures for hyperthermia. The mag@zcf1 MFN achieved the highest SLP, demonstrating improved heating efficiency for potential cancer treatments.

Keywords:
core-shellhyperthermiamagnetic ferrite nanoparticlesmodified co-precipitation

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biomedical Engineering

Background:

  • Magnetic ferrite nanoparticles (MFNs) are crucial for hyperthermia cancer therapy due to their heating capabilities.
  • Conventional MFNs often exhibit low specific loss power (SLP), limiting their therapeutic efficacy.
  • Enhancing SLP is essential for improving MFN performance in hyperthermia applications.

Purpose of the Study:

  • To increase the specific loss power (SLP) of magnetic ferrite nanoparticles (MFNs) by engineering core-shell structures.
  • To investigate the impact of composition and dimensions on the hyperthermia performance of MFNs.
  • To compare the efficacy of novel core-shell MFNs against commercial nanoparticles.

Main Methods:

  • Synthesis of core ferrite nanoparticles: magnetite (mag), cobalt ferrite (cf), and zinc cobalt ferrite (zcf).
  • Fabrication of eight bi-magnetic core-shell MFNs using a modified controlled co-precipitation method.
  • Evaluation of SLP values under varying magnetic field strengths and frequencies, adhering to safety limits.

Main Results:

  • The mag@zcf1 core-shell MFN exhibited the highest SLP (379.2 W/gmetal) at 50 kA/m and 97 kHz.
  • The cf@mag1 core-shell MFN showed the lowest SLP (1.7 W/gmetal) at 40 kA/m and 97 kHz.
  • Magnetic properties and shell thickness significantly influence heating efficiency and hyperthermia performance.

Conclusions:

  • Engineered core-shell structures significantly enhance the specific loss power (SLP) of magnetic ferrite nanoparticles.
  • The mag@zcf1 composition demonstrates superior heating efficiency, making it a promising candidate for hyperthermia.
  • Tailoring MFN composition and dimensions is a viable strategy for optimizing hyperthermia treatment efficacy.