Fig. 7: Visible light-induced switching of hydrogels stiffness.
a Representative scheme of photoswitching of the inserted thioindigo isomers with different dipole moments within hydrogel structure (top), and images of GelT5 in water at 37 °C following green (λmax = 540 nm) or blue (λmax = 470 nm) LED light irradiation for 30 min, displaying expansion and contraction; b UV-vis spectra of GelT5 at 37 °C following green and blue light irradiation over 30 min of each treatment; c Rheological data of the photoswitching of GelT5 under alternating green and blue light irradiations and d green light irradiation with intermittent thermal recovery.
