Fig. 2From: Polymer coated gold-ferric oxide superparamagnetic nanoparticles for theranostic applicationsSurface zeta potential of a Au–Fe3O4, and b PLL–Au–Fe3O4 NPs in water, PBS, RPMI 1640 cell culture medium and PBS containing 10% FBS. Three colored (red, green and blue) lines indicate three replicates from three independent experiments. Multiple peaks in Au–Fe3O4 (a) indicate their aggregation behavior that disappears after PLL coating (b)Back to article page