Synthesis, Characterization, and Magnetism of Dendrimer Encapsulated Co Nanoparticles

Abstract

Preparation and characterization of magnetic Co dendrimer-encapsulated nanoparticles (DENs) have been studied. As these materials are easily oxidized, the synthesis was carried out under anaerobic conditions in organic solvents. Using a hydrophobically modified G6-PAMAM dendrimer template, DENs consisting of 55 and 147 Co atoms were prepared using a single-phase direct reduction technique. Characterization of the DENs by UV-vis spectroscopy and transmission electron microscopy (TEM) indicated the synthesis of particles. The materials are nearly monodisperse with average particle diameters > 0.9 nm with dispersities of 0.2 nm. Magnetic studies of both sized DENs indicate that they are superparamagnetic with hysteresis-free magnetism. These resultant effects are directly correlated to the particle size, which has been shown to significantly affect their resultant behavior.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2005
Accession Number
ADA516324

Entities

People

  • Marc R Knecht
  • Marquita D. Bradshaw
  • Richard M Crooks

Organizations

  • Texas A&M University

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Chemistry
  • Dendrimers
  • Electron Microscopy
  • Materials
  • Metallic Nanoparticles
  • Metals
  • Microscopy
  • Nanoparticles
  • Organic Solvents
  • Particle Size
  • Particles
  • Polymer Chemistry
  • Polymers
  • Production Engineering
  • Spectra
  • Transition Metals
  • Transmission Electron Microscopy

Readers

  • Nanocomposite Materials Science

Technology Areas

  • Biotechnology
  • Microelectronics