Figure 46.

Shape-change experiment with the β-CD-Ad-Fc PAAm gel. First, a linear-cylindrical piece of β-CD-Ad-Fc PAAm gel (2,1,1) (diameter, 5 mm; length, 50 mm) was oxidized in an aqueous buffer containing CAN (25 mM) for 3 h, during which time it adopted a helical shape. Subsequently, the gel was reduced by immersion in the original buffer. When the gel was shaken in the buffer for 3 days, it retained its helical shape. This shape-memory effect did not occur without the oxidation–reduction cycle. (b) Schematic illustration of the shape-memory mechanism. Adapted with permission from ref (388). Copyright 2015 John Wiley and Sons.