Premium
Magnetite/Polymer Composite Particles Prepared by Molecular Assembling Followed by In‐Situ Magnetite Formation
Author(s) -
Yamagata Mika,
Abe Masanori,
Handa Hiroshi,
Kawaguchi Haruma
Publication year - 2006
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200651350
Subject(s) - magnetite , superparamagnetism , polymer , materials science , iron oxide , chemical engineering , copolymer , composite number , ethylene oxide , polymerization , polymer chemistry , ferrous , aqueous solution , radical polymerization , ferric , chemistry , magnetization , composite material , organic chemistry , metallurgy , physics , quantum mechanics , magnetic field , engineering
Magnetic nano‐particles composed of superparamagnetic iron oxide in the core and hydrophilic polymer in the shell were prepared for the use of MRI contrast agents. Ferric and ferrous ions were added to an aqueous solution of block copolymer, poly(ethylene oxide)‐block‐poly(glycelol methacrylate‐co‐acrylic acid), which was prepared by living radical polymerization using iniferter. After iron ions‐polymer complex formation, the pH of the solution was raised to 11 to get magnetite nanoparticles which were encapsulated with polymer. Use of the polymer having the molecular weight of ca. 10,000 and the 100 × AAc/GLM of 1–10 and incubation of the mixture of iron ions and water‐soluble polymers at a moderate temperature resulted in the formation of favorable composite particles of 10–20 nm in diameter. The saturation magnetization and other instrumental analysis of composite particles suggested that the iron oxide formed in the above‐mentioned procedure was magnetite.