fig4

Figure 4. Wettability analysis of epoxy resin on CF monofilaments: (A) optical micrographs (OM) schematic representations of the droplet profiles and surface curvature; (B) static contact angles measured by the tangent method, with data presented as mean ± standard deviation (ten droplet profiles for each sample group); (C) droplets height versus length for contact-angle determination; (D) quantitative evaluation of wettability through functional correlation analysis. CF: Carbon fiber; GO-CNT: graphene oxide-carbon nanotube; CA: contact angle.