Fig. 4: Behavior of Azo-FV systems at high concentration.

a Photographs of solutions formed from the initial Azo-FV trans-isomer (left), the cis-isomer (middle) and the trans-isomer after reversal (right), all at 200 mg mL⁻¹; b viscosity data for solutions formed from the trans-isomer (orange), the cis-isomer (purple) and after reversal back to the trans-isomer (light blue); c SAXS data for the solutions formed from initial trans-isomer (orange), the cis-isomer (purple) and the trans-isomer after reversal (light blue), all at 200 mg mL⁻¹; d photographs of gels formed from initial trans-isomer (left), the cis-isomer (middle) and the trans-isomer after reversal (right), all at 200 mg mL⁻¹, on addition of a calcium salt; e rheology of gels formed at 200 mg mL⁻¹ from the trans-isomer (orange), the cis-isomer (purple) and after reversal back to the trans-isomer (light blue); f SAXS data for the gels formed from initial trans-isomer (orange), the cis-isomer (purple) and the trans-isomer after reversal (light blue), all at 200 mg mL⁻¹. All isomerizations were carried out by placing two LEDs 5 cm away from the sample and irradiating for 10 min.