Fig. 5: pH-responsive behavior and rheological properties of hydrogel and composite coating.

a pH-induced solid-liquid transition of AB hydrogel. Storage (G′) and loss (G″) moduli versus oscillation strain for b AB hydrogel at pH = 7, pH = 9 and pH = 11, c AB/PTPM at pH = 7, pH = 9 and pH = 11. d Complex viscosity of AB/PTPM as a function of angular frequency at pH = 7, pH = 9 and pH = 11.