Premium
Polydimethylsiloxane‐magnetite nanoparticle complexes and dispersions in polysiloxane carrier fluids
Author(s) -
Wilson K. S.,
Goff J. D.,
Riffle J. S.,
Harris L. A.,
St Pierre T. G.
Publication year - 2005
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.572
Subject(s) - materials science , magnetite , polydimethylsiloxane , ferrofluid , nanoparticle , magnetite nanoparticles , carboxylate , chemical engineering , tetramethylammonium hydroxide , polymer , polymer chemistry , magnetic nanoparticles , nanotechnology , organic chemistry , chemistry , composite material , magnetic field , physics , quantum mechanics , engineering , metallurgy
Dispersions of sterically stabilized magnetite nanoparticles in polydimethylsiloxane (PDMS) carrier fluids have been prepared for potential biomedical applications. Trivinylsiloxy‐terminated PDMS was functionalized with mercaptoacetic acid or mercaptosuccinic acid to afford PDMS stabilizers containing either three or six carboxylic acid groups, respectively, at one chain‐end. Magnetite nanoparticles were synthesized by a chemical co‐precipitation reaction of FeCl 2 and FeCl 3 with hydroxide at pH 9–10. Subsequently, the PDMS stabilizers were adsorbed onto the magnetite nanoparticle surfaces via the carboxylate groups in an interfacial reaction at an acidic pH. The complexes were characterized with transmission electron microscopy to establish an average particle diameter of 7.4 ± SD 1.7 nm and approximately spherical shape. Complexes containing up to 67 wt% magnetite were prepared using these PDMS stabilizers, resulting in maximum saturation specific magnetizations of ∼50 emu g −1 . The polymer‐magnetite nanoparticle complexes could be dispersed in PDMS oligomers to afford polysiloxane ferrofluids. Copyright © 2005 John Wiley & Sons, Ltd.