Fig. 3
From: Tiny Rare-Earth Fluoride Nanoparticles Activate Tumour Cell Growth via Electrical Polar Interactions
TEM digital (x, y) size histograms of RE-NPs. (a1, b1) TEM images of RE-NPs. Yellow lines indicated 2D boundaries between RE-NPs. (a2, b2) (x, y) size histograms of mean equal circle area diameter \( \left(\overline{d}\right) \) of RE-NPs. (a3, b3) (x, y) size histograms of Feret area diameter \( \left(\overline{\ F.D.}\right) \) of RE-NPs. (a4, b4) Feret angle (F.A.) histograms relative to the x-axis with preferential directions at ±(44–60°). (c) Size histogram of Feret diameter of small and tiny size RE-NPs extracted from both AFM and TEM images for 4 μm2 areas