The Synthesis of Magnetic Core-Shell Nanoparticles by Surface-Initiated Ring-Opening Polymerization of ε-Caprolactone

✍ Scribed by Annette M. Schmidt

• Publisher: John Wiley and Sons
• Year: 2005
• Tongue: English
• Weight: 222 KB
• Volume: 26
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.200400426

✦ Synopsis

Abstract

Summary: The synthesis of core‐shell particles with a poly(ε‐caprolactone) (PCL) shell and magnetite (Fe~3~O~4~) contents of between 10 wt.‐% and 41 wt.‐% proceeds by surface‐initiated ring‐opening polymerization of ε‐caprolactone to give surface‐immobilized oligomers with $\overline M _{\rm n}$ between 1 400 g · mol^−1^ and 11 500 g · mol^−1^. The particles are dispersable in good solvents for the PCL shell. Magnetization experiments on the resulting superparamagnetic ferrofluids give a core‐size distribution with an average diameter, d~v~, of about 9.7 nm.

TEM image of Fe~3~O~4~/PCL core‐shell particles cast from CHCl~3~ dispersion.

imageTEM image of Fe~3~O~4~/PCL core‐shell particles cast from CHCl~3~ dispersion.