Fig. 2

Characteration of the 3D hydrogel/nanofiber composite scaffolds. A Optical images (a₁–a₃), SEM images (low-magnification, b₁-b₃; High-magnification, c₁–c₃), TEM images (d₁–d₃) and water contact angle (e₁–e₃) for the three kinds of scaffolds: PT-P (a₁–e₁); PT-P/GM (a₂–e₂); 3D-PT-P/GM (a₃–e₃). B SEM images for the cross section of the three kinds of scaffolds: PT-P (a₁–b₁); PT-P/GM (a₂–b₂); 3D-PT-P/GM (a₃–b₃). C FTIR spectra of PDLLA, GelMA, PT-P/GM