Fig. 4

Sedimentation profile evaluation for NP stock dispersions. Sedimentation profiles of 25 mM ZnO stock dispersions (pH = 7.3) for a 2-h time period. a nZnO, nZnO – FBS^dried, nZnO – FBS^washed, and nZnO – FBS stock dispersions in various biologically relevant solutions. b Sedimentation histograms for 0, 0.5, 1.0, 1.5, and 2.0-h time points for nZnO – FBS^dried, nZnO – FBS^washed, and nZnO – FBS stock dispersions in PBS and nanopure water