Multitechnique size determination of Fe/FeOxide@NaCit magnetic nanoparticles after magnetic separation.

L.J. MENDOZA HERRERA; M. B. FERNÁNDEZ VAN RAAP; G. A, MUÑOZ; D.MURACA; F. H. SÁNCHEZ; I. BRUVERA; D. F. CORAL

Campinas

Otro; LNLS 28th Annual Users? Meeting (RAU); 2018

CNPEM

Colloids of Fe/FeOxide@NaCit were prepared by a combined route of mechanochemistry + chemical coprecipitation + electrostatic stabilization. The obtained nanomaterial presents a high magnetic response characterized by a saturation magnetization up to 130 Am2/kgFe, long stability of more than two years, and biocompatibility confirmed by MTT essays which gave viability values of 80%. These materials are excellent candidates for several biomedical applications. In this work we present size characterizations of different fractions of the colloid obtained by magnetic separation. The separation process was performed using an ad hoc multi chamber prototype holding two NdFeB permanent magnets (Fig. 1). The size distributions of the resulting fractions were characterized by TEM, SAXS and a nobel optical method based in UV-Vis spectroscopy. The results of these three techniques are compared, finding consistent concordance and complementary information.