Fig. 2

Characterization of the Eu-MOF/GelMA composite hydrogel. A Preparation of the Eu-MOF/GelMA composite hydrogel block. B Fluorescence images and 3D reconstructions of the CT images of the Eu-MOF/GelMA composite hydrogel with Eu-MOF concentrations ranging from 0 to 20 mg/mL. The corresponding fluorescence intensities and CT values are given in the plots below the images. C Compressive load-compressive displacement curve of the Eu-MOF/GelMA composite hydrogel with an Eu-MOF concentration of 20 mg/mL. D Relative cell viability determined by a CCK-8 assay of HFL1 cells incubated with different concentrations of the Eu-MOF for 24 h