Fig. 5: Curling of BTX-gel strip by light-gated redox switching.
From: Light-gated redox switching and actuation in polymer hydrogels
a Schematic illustration and (b) photographs of light-gated-redox actuation of an initial homogeneous BTX-gel (Method 1) in an aqueous solution containing 30 mm aqueous Fe(ClO4)3 by continuous irradiation with 365 nm light from the bottom until the bending motion stopped. This induces a gradient with a higher degree of oxidation, and thus swelling, on the side of the material that is closer to the light source, which ultimately results in significant bending.
