Fig. 2
From: Polymer coated gold-ferric oxide superparamagnetic nanoparticles for theranostic applications
Surface 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)