Accession Number:

AD1071153

Title:

Novel multi-ferroic nanoparticle-based stretchable composite metamaterials with enhanced magneto dielectric performance

Descriptive Note:

Technical Report,31 Jul 2017,30 Jul 2018

Corporate Author:

SEOUL NATIONAL UNIVERSITY Seoul Korea, South

Personal Author(s):

Report Date:

2019-03-14

Pagination or Media Count:

33.0

Abstract:

Traditional magnetite nanoparticles have a saturation magnetization between 45 emug and 55 emug due to surface and volume spincanting and defects. However, it has been recently demonstrated that it is possible to improve the saturation magnetization of magnetite nanoparticles by their collective oriented organization in a single nanostructure. The team synthesized corona-shaped magnetite nanostructures that acquire collective assembly during synthesis. Stretchable magneto-dielectric composites were prepared using collectively assembled iron oxide nanostructures as fillers in an elastomer polydimethylsiloxane matrix. The resulting composites can be stretched up to 165 strain before failure due to good adhesion between the elastomer and citrate-capped raspberry-shaped nanostructures. A magnetically recoverable photocatalyst was prepared by supporting TiO2 nanoparticles on superparamagnetic raspberry-shaped nanocomposite comprised of a iron oxide nanocluster corefibrous silica shell. In addition, using raspberry-shaped iron oxides nanoparticles as core material, a carbon nanoshell was further coated by facile methods. It was demonstrated that raspberry shaped magnetite nanostructures are very interesting and even key elements to fabricate flexible materials with low dielectric loss, high permittivity and permeability values at radio frequencies 1 MHz- 1 GHz. The permeability values achieved by composites made from collectively assembled corona magnetite nanoparticles are significantly higher than the existing magnetite-polymer composites and magnetite-PDMS composites. Additionally, the composites prepared with collectively assembled corona magnetite nanoparticles exhibit an extraordinary magnetic resonance, which changes with the particle size of magnetite nanoparticles. In contrast to these interesting and promising properties of the composites, the composites

Subject Categories:

  • Laminates and Composite Materials
  • Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE