The SEM image in Figure 1b shows the clear pore structure on the surface of the hydrogel, and EDS mapping shows that the zwitterionic hydrogel has a characteristic S element.
The SEM of Fig. 1b shows the clear pore structure of the hydrogel surface. EDS mapping shows that the zwitterionic hydrogel has the characteristic S element.
The scanning electron microscope of fig. 1b shows the clear pore structure of hydrogel surface layer, and EDS mapping shows that zwitterionic hydrogel has the characteristic S element.