Fig. 5
From: Anisotropic and self-healing hydrogels with multi-responsive actuating capability
Self-healing performance. a Schematic illustration of NIR laser-induced and pH-mediated self-healing mechanisms. b Time-dependent temperature changes of the SNPP hydrogel when exposed to NIR laser with various output power. c Tensile stress–strain curves of hydrogel piece relative to its original state and different healing times under NIR laser. d UV-vis spectra of Ag@BACA composite recorded to monitor the binding behavior between BACA and silver NPs in different pH solutions. The inset schemes illustrate the reversible binding of BACA and silver NPs with the regulation of pH. e Tensile stress–strain curves of the healed SNPP hydrogel piece through a pH mediated way. The inset optical images show high stretchability of the healed gel induced by the acid solution
