Fig. 1From: Nanodiamond enhanced mechanical and biological properties of extrudable gelatin hydrogel cross-linked with tannic acid and ferrous sulphateScheme for the dispersion and subsequent 3D printing of the nanocomposite gelatin hydrogel. Homogeneous mixture of gelatin and NDs was obtained by the twin screw extruder (TSE), then TA and FS were added and stirred for 15 min. Finally, the ND-dispersed gelatin was kept undisturbed for 1 h gelation before extrusion-based 3D printingBack to article page