Figure 1 : Polymer gels used to prepare photoresponsive supramolecular actuators and their expansion–contraction behaviour.

From: Expansion–contraction of photoresponsive artificial muscle regulated by host–guest interactions

Figure 1

(a) Chemical structures of αCD–Azo gel, αCD gel (without the Azo–AAm unit), Azo gel (without the αCD–AAm unit) and AAm gel (without αCD–AAm and Azo–AAm units). x is the mole percentage of the host and guest units. y is the mole percentage of the crosslinking unit (MBAAm). (b) Weight ratio change in the gels upon replacing DMSO with water. Gels initially absorb DMSO. The weight ratio of gel absorbed with DMSO is defined as 100%. Error bars, standard deviation for 5 measurements. (c) Photographs of the volume change of αCD–Azo gel (x, 4) upon replacing DMSO with water. Av., average.