Fig. 2
Design and characterization of BANSs. (A) Schematic illustration of BANSs preparation and their decomposition in an acidic microenvironment. (B) TEM images of BANSs (scale bar, 0.1 μm). (C) Fourier-transform infrared spectroscopy (FT-IR) spectra of BANSs, OVA, and CaCO3 (D) X-ray powder diffraction (XRD) pattern of the BANSs, OVA, and pristine CaCO3. (E) Circular dichroism (CD) spectrum of OVA, ANSs, and BANSs. (F) Thermal gravimetric analysis (TGA) of CaCO3 and BANSs. (G) Derivate TGA DTG curves of BANSs, OVA, and CaCO3. (H) The CO2 generated by BANSs in neutral and acidic environments was measured using an 8 MHz linear transducer