Journal
LANGMUIR
Volume 17, Issue 16, Pages 5093-5097Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la010421+
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Sonochemical decomposition of Fe(CO)(5) was carried out in the presence of different surfactants. The reactions give stable colloids of undecenoate, dodecyl sulfonate, and octyl phosphonate coated Fe2O3 nanoparticles of 5-16 nm in diameter. The ionic binding of the surfactants to the nanoparticle surfaces was confirmed by FTIR spectroscopy. Electron paramagnetic resonance measurements, magnetization curves, and zero-field cooled and field cooled studies indicate that the as-prepared amorphous nanoparticles are superparamagnetic. These studies show that the phosphonate-coated nanoparticles behave in a strikingly different manner from the other particles. It is proposed that the extra negative charge on the phosphonate, as compared to the carboxylate and sulfonate groups, makes it a strong bridging bidentate ligand, resulting in the formation of strong ionic bonds to the surface Fe3+ ions, which decreases the number of unpaired spins, possibly through a double superexchange mechanism through a Fe3+-O-P-O-Fe3+ pathway.
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