Figure 17.

(a) Schematic illustration of the PSS-b-PMB BCP humidity sensor at low and high RH and photographs of sensors at different RH. Reproduced with permission.⁹⁶ Copyright 2012, American Chemical Society. (b) Schematic representation of the mechanism for color change in the PS-b-QP2VP photonic lamellar gels by a direct exchange of counter-ions in the QP2VP layers and photographs of the films showing different colors with increasing hydration energy of the counter-anions. Reproduced with permission.⁹⁷ Copyright 2012, American Chemical Society.