To incorporate Ce into MBGNs, an adapted postimpregnation method previously reported was performed [41 ,42 ]. Briefly, the as-synthesized MBGNs were soaked in an ethanol solution of cerium nitrate (0.2M or 0.05M) at the concentration of 10 mg/mL under stirring for 24 h at different temperatures (i.e., 20, 60, and 80 °C). After the impregnation process, the treated MBGNs were washed with ethanol twice before drying at 60 °C overnight. The dried nanoparticles were then calcined in air at 680 °C for 2 h with a heating rate of 2 °C/min in a furnace. The unmodified MBGNs were also calcined at 680 °C for comparison. Fig. 1 a shows the schematic illustration of the MBGN synthesis and the postmodification process.Fig. 1 ![]()
(a) Schematic illustration of MBGN synthesis and the postmodification process. (b) SEM images of the morphology of MBGN, 0.05 M Ce-MBGN, and 0.2 M Ce-MBGN, and (c) TEM images of MBGN, 0.05 M Ce-MBGN, and 0.2 M Ce-MBGN. MBGN, mesoporous bioactive glass nanoparticle; SEM, scanning electron microscope; TEM, transmission electron microscopy.
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