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The Synthesis of Magnetic Core‐Shell Nanoparticles by Surface‐Initiated Ring‐Opening Polymerization of ε ‐Caprolactone
Author(s) -
Schmidt Annette M.
Publication year - 2005
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200400426
Subject(s) - superparamagnetism , caprolactone , ferrofluid , materials science , dispersion polymerization , shell (structure) , polymerization , magnetite , ring opening polymerization , polymer chemistry , chemical engineering , nanoparticle , core (optical fiber) , magnetic nanoparticles , dispersion (optics) , magnetization , composite material , nanotechnology , polymer , magnetic field , optics , physics , quantum mechanics , metallurgy , engineering
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.