Figure 2. Characteristics of the formulated A-SA-Gel
hydrogel and the 3D printed scaffolds from the hydrogel: (A) The
viscosity of the hydrogel that has a shear thinning behavior. (B)
The modulus of the crosslinked hydrogel that has a higher storage
modulus than that of loss modulus. (C-D) Photograph of the 3D printed
hydrogel scaffold (top view) and its side view. (E) SEM micrographs of
the top view of the printed scaffold (white dotted line indicate
the different layers of the scaffolding system, scale bars: 500
μm), (F-G) corresponding magnification of C (scale bars: F=500μm,
G=250μm), (H) the filaments of different layers of the scaffold (scale
bars:250μm), (I) cross-sections morphology of the scaffold (scale
bars:250μm), (J) a close view of morphology of the scaffold (scale
bars:50μm), and (K-M) SEM images of the surface of a single printed
filament (scale bars:
K=250 μm,L=100μm,M=25μm).