Figure 4

Scanning electron micrographs of (A1-1 mm and A2-10 µm) CRU before release and (B1-1 mm and B2-10 µm) CRU after release.

Scanning electron micrographs of (A1-1 mm and A2-10 µm) CRU before release and (B1-1 mm and B2-10 µm) CRU after release.