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3D freeform printing of nanocomposite hydrogels
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           Figure 2. Schematics and optical images of three-dimensional-printed scaffolds. (A) Hyaluronic acid-
           alginate (HAc-Alg) hydrogel scaffolds (perspective view, top view, and side view). (B) HAc-Alg/30 wt%
           calcium phosphate composite hydrogel scaffolds (perspective view, top view, and side view).

                        A                       B                       C











                        D                       E                       F










                        G                       H                        I












           Figure  3.  Surface  and  cross-sectional  morphologies  of  dehydrated  3D-printed  scaffolds.  (A-C)  Surface
           morphology  of  hyaluronic  acid-alginate  (HAc-Alg)  hydrogel  scaffolds.  (D-F)  Surface  morphology  of
           HAc-Alg/30 wt% calcium phosphate (CaP) composite hydrogel scaffolds. (G) Cross-sectional morphology of
           a printed HAc-Alg filament. (H and I) Cross-sectional morphology of a printed HAc-Alg/30 wt% CaP filament.

           36                          International Journal of Bioprinting (2020)–Volume 6, Issue 2
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