Fig. 4From: Enhanced thermal conductivity of waste sawdust-based composite phase change materials with expanded graphite for thermal energy storageSEM photographs of the a waste sawdust (×100), b waste sawdust (×500), c waste sawdust (×800), d CPCMs-1 (×800), e CPCMs-2 (×800), f CPCMs-3 (×800), g CPCMs-4 (×100), h CPCMs-4 (×500), and i CPCMs-4 (×800)Back to article page