Artículo
Synthesis and characterization of nanometric magnetite coated by oleic acid and the surfactant CTAB
Autor
ALMAZAN CELIS, JONATHAN; 628729
OLEA MEJIA, OSCAR FERNANDO; 170933
CABRAL PRIETO, AGUSTIN; 8534
GARCIA SOSA, IRMA MARIA ENGRACIA; 123150
DERAT, RAUL;#0000-0001-5777-1648
Baggio Saitovitch, Elisa;#0000-0003-4082-8585
Alzamora Camarena, Mariella;#0000-0002-1198-7168
ALMAZAN CELIS, JONATHAN
OLEA MEJIA, OSCAR FERNANDO
CABRAL PRIETO, AGUSTIN
GARCIA SOSA, IRMA MARIA ENGRACIA
DERAT, RAUL
Baggio Saitovitch, Elisa
Alzamora Camarena, Mariella
Institución
Resumen
For the intermediate and largest particles a mixture of magnetite and maghemite phases were produced as the saturation magnetization values of MS ∼ 60 emu/g indicated; these values were measured for most samples, independently of the coating surfactant concentration, and according to the ZFC-FC curves the blocking temperatures were 225K and 275K for the smallest and largest magnetite nanoparticles, respectively. The synthesis method was highly reproducible. Nanometric magnetite (nm-Fe3O4) particles were prepared by the reverse co-precipitation synthesis method, obtaining particle sizes that ranged from 4 to 8.5 nm. In their synthesis, the concentration of iron salts of ferric nitrate, Fe(NO3)3⋅9H2O, and ferrous sulfate, FeSO4⋅7H2O, were varied relative to the chemical reaction volume and by using different surfactants such as oleic acid (OA) and hexadecyltrimethylammonium bromide (CTAB). The nm-Fe3O4 particles were characterized by transmission electron microscopy (TEM), Mössbauer spectroscopy (MS), magnetic and X-ray diffraction (XRD) measurements.