Accession Number:

ADA516324

Title:

Synthesis, Characterization, and Magnetism of Dendrimer Encapsulated Co Nanoparticles

Descriptive Note:

Research paper

Corporate Author:

TEXAS A AND M UNIV COLLEGE STATION DEPT OF CHEMISTRY

Personal Author(s):

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

Report Date:

2005-01-01

Pagination or Media Count:

6.0

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.

Descriptors:

• *DENDRIMERS
• *MAGNETIC PROPERTIES
• *NANOPARTICLES
• *COBALT
• *SYNTHESIS(CHEMISTRY)
• HYSTERESIS
• PARAMAGNETISM
• ANAEROBIC PROCESSES
• ORGANIC SOLVENTS
• AMINES
• REDUCTION
• TRANSITION METALS
• PARTICLE SIZE
• SOLUBILITY

Subject Categories:

• Inorganic Chemistry
• Physical Chemistry
• Polymer Chemistry
• Metallurgy and Metallography
• Electricity and Magnetism

Distribution Statement:

APPROVED FOR PUBLIC RELEASE