Mh. Sousa et al., New electric double-layered magnetic fluids based on copper, nickel, and zinc ferrite nanostructures, J PHYS CH B, 105(6), 2001, pp. 1168-1175
We report on stable colloidal aqueous suspensions of magnetic nanostructure
s made of copper, nickel, and zinc ferrites. These magnetic fluids could re
present a new alternative for biological applications. The basic steps of t
he nanoparticles synthesis, their chemical surface treatment, and their pep
tization in a stable colloidal sol are given. Their chemical composition is
carefully checked, and X-ray diffraction patterns provide both their mean
size and a structural characterization. Magnetization results obtained at 3
00 K are presented and discussed.