Fig. 5

Material characterisation of Nanoparticles (NPs). A and B Transmission Electron Microscopy images of nanobubbles (NBs) and ultrasound sensitive siRNA-loaded nanobubbles (siRNA-NBs) (scale: 200 nm); C and D Scanning electron microscopy images of NBs and siRNA -NBs (scale: 200 nm). E and F The average sizes of NBs and siRNA-NBs were 216.30 ± 1.54 nm and 223.17 ± 2.23 nm, respectively; G and H The average zeta potentials of NBs and siRNA -NBs are 22.63 ± 0.55 mV and -1.94 ± 3.72 mV, respectively