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Air stable Fe and FeCo magnetic fluids—synthesis and characterization
Author(s) -
Bönnemann H.,
Brand R. A.,
Brijoux W.,
Hofstadt H.W.,
Frerichs M.,
Kempter V.,
MausFriedrichs W.,
Matoussevitch N.,
Nagabhushana K. S.,
Voigts F.,
Caps V.
Publication year - 2005
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.896
Subject(s) - chemistry , x ray photoelectron spectroscopy , auger electron spectroscopy , transmission electron microscopy , magnetization , metal , magnetic nanoparticles , particle (ecology) , analytical chemistry (journal) , chemical engineering , nanoparticle , inorganic chemistry , organic chemistry , magnetic field , physics , oceanography , quantum mechanics , nuclear physics , engineering , geology
Thermolysis of Fe(CO) 5 and Co 2 (CO) 8 , dissolved in tetrahydronaphthalene, in the presence of aluminum trialkyl leads to uniform‐sized Fe or FeCo nanoparticles, respectively. Subsequent treatment with very dilute oxygen forms a shell which protects the metallic or alloyed core of the particles against further oxidation. With the help of surfactants, for instance oleic acid or cashew nut shell liquid, the particles can be peptized in organic solvents like toluene or kerosene, resulting in magnetic fluids with extraordinary magnetic properties. The saturation of magnetization, M s , of the fluids was determined by specific magnetization. The sizes and structure of the particles were investigated by transmission electron microscopy, and Moessbauer analysis showed that the core of the particles was metallic or alloyed, respectively. The particle surface termination was studied by X‐ray photoelectron spectroscopy and Auger electron spectroscopy. Copyright © 2005 John Wiley & Sons, Ltd.