The excess amount of oleic acid must be added to synthesize the bilayer oleic acid-coated Fe3O4 nanoparticles by onestep
method. To know the evolution of surface structure during removing the residual oleic acid by ethanol washing, the
surface structure of bilayer oleic acid-coated Fe3O4 nanoparticles synthesized by one-step method was studied using
TEM, FTIR and TGA with washing times. The results showed that after five times washing, the bilayer oleic acid-coated
structure still remained; after twenty times washing, the bilayer oleic acid-coated structure evolved into the single layer
one.
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