Fig. 5

SEM images for the as-received and RMNPs at different milling times a RawRM (0 h); b 6 h-RMNPs; c 12 h-RMNPs; d 18 h-RMNPs; e 24 h-RMNPs; f 30 h-RMNPs.

SEM images for the as-received and RMNPs at different milling times a RawRM (0 h); b 6 h-RMNPs; c 12 h-RMNPs; d 18 h-RMNPs; e 24 h-RMNPs; f 30 h-RMNPs.