Figure 2

Surface morphological and topographical images of PLGA, GO-PLGA, PLGA-Col, and GO-PLGA-Col fibre matrices. (A) FESEM images and (B) AFM images of PLGA, GO-PLGA, PLGA-Col, and GO-PLGA-Col fibre matrices. All photographs shown in this figure are representative of six independent experiments with similar results. (C) Correlation between fibre diameter of matrices and their surface roughness (R _a). The different letters in (C) denote the significant differences between each experimental group, p < 0.05. If two groups have the same single letter (a, b), there is no significant difference between them.