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FE-SEM images of epoxy-based composites containing MPCF-rGO hybrid fillers of MPCF length (6 mm) and different rGO contents (0 to 3 wt%). The total loading amounts of only MPCF or MPCF-rGO hybrid fillers in the epoxy-based composites were adjusted to 50 wt%: MPCF:rGO weight ratios of (a) 50:0, (b) 49:1, (c) 48:2, and (d) 47:3.
