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. 2018 Aug;13(8):1455–1464. doi: 10.4103/1673-5374.235303

Figure 2.

Figure 2

Physicochemical properties of scaffolds.

(A) Fourier transform infrared spectra of composites: (a) PPy; (b) 3D-printed SF treated with ethanol; (c) PPy-coated 3D-printed SF; (d) Py. Dotted lines represent characteristic peaks. (B) Electrical conductivity of different 3D bioprinted aligned SF scaffolds. Aligned PPy/SF scaffolds of varying diameters and distances (a1–b3): a1-80/500, a2-120/500, a3-180/500, b1-80/700, b2-120/700, and b3-180/700. Composite PPy/SF scaffolds with varying diameters and distances (a1’–b3’): a1’-80/500, a2’-120/500, a3’-180/500, b1’-80/700, b2’-120/700, and b3’-180/700. The number in front of the slash represents the diameter of PPy/SF scaffolds, while the number behind the slash represents the distance between channels of PPy/SF scaffolds. Data represent mean ± SEM. An unpaired two-tailed Student's t-test was used to evaluate comparisons between two groups. For multiple-group comparisons, one-way analysis of variance with Bonferroni's post hoc test was performed to estimate differences among group means. All experiments were carried out in triplicate. SF: Silk fibroin; PPy: polypyrrole; 3D: three-dimensional.