fig3

Figure 3. Gross appearances (A) and SEM images (B) of agarose and agarose/Fe3O4 hydrogels with different concentrations of citrate-modified Fe3O4 NPs. Gross appearances (C) and SEM images (D) of gelatin and gelatin/Fe3O4 porous scaffold with different concentrations of citrate-modified Fe3O4 NPs.