Fig. 2
From: Tiny Rare-Earth Fluoride Nanoparticles Activate Tumour Cell Growth via Electrical Polar Interactions
AFM digital (x, y) size histograms of RE-NPs. (a1–d1) PrF3 (2 × 2 μm2) and LaF3 (1 × 1 μm2) NPs in DMEM+FBS suspensions. (a2–d2) (x, y) size histograms of mean equal circle area diameter \( \left(\overline{d}\right) \) of RE-NPs. (a3–d3) (x, y) size histograms of Feret area diameters \( \left(\overline{\ F.D.}\right) \) of RE-NPs. (a4–d4) Feret angle (F.A.) histograms relative to the x-axis. RE-NPs were oriented along two main directions between ±(44–60°)