Supercritical fluid technology of nanoparticle coating for new ceramic materials

J Nanosci Nanotechnol. 2005 Jun;5(6):980-3. doi: 10.1166/jnn.2005.147.

Abstract

This work highlights, for the first time, the coating of ferroelectric nanoparticles with a chemical fluid deposition process in supercritical fluids. BaTiO3 nanoparticles of about 50 nm are coated with a shell of a few nanometers of amorphous alumina and can be recovered as a dry powder for processing. The sintering of these core-shell nanoparticles gives access to a ceramic material with very interesting ferroelectric properties, in particular, dielectric losses below 1%.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adsorption
  • Aluminum Oxide / analysis
  • Aluminum Oxide / chemistry*
  • Barium Compounds / analysis
  • Barium Compounds / chemistry*
  • Ceramics / analysis
  • Ceramics / chemistry
  • Chromatography, Supercritical Fluid / methods*
  • Crystallization / methods
  • Ferric Compounds / analysis
  • Ferric Compounds / chemistry*
  • Magnetics*
  • Materials Testing
  • Nanotechnology / methods*
  • Nanotubes / analysis
  • Nanotubes / chemistry*
  • Nanotubes / ultrastructure*
  • Particle Size
  • Titanium / analysis
  • Titanium / chemistry*

Substances

  • Barium Compounds
  • Ferric Compounds
  • barium titanate(IV)
  • ferrite
  • Titanium
  • Aluminum Oxide