Figure 2
From: Mechano-synthesized orange TiO2 shows significant photocatalysis under visible light

TEM images of (a) P25 before milling and (b) P25 after milling with melamine. (c) HR-TEM images of (c) P25 before milling and (d) P25 after milling with melamine. Red line is a guide for eye to observe a grain boundary.