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SEM images of fracture surfaces of cured composite made from impregnating CNFs in (a) epoxy/acetone solution at a ratio of 3:1 (low resolution); (b) epoxy/acetone solution at a ratio of 3:1 (high resolution); (c) epoxy/acetone solution at a ratio of 1:3 (low resolution); and (d) epoxy/acetone solution at a ratio of 1:3 (high resolution).
