Fig. 4
From: Smart photonic crystal hydrogels for visual glucose monitoring in diabetic wound healing
Glucose response of double network PCHs. (a-b) Optical images of blue PCHs (a) and green PCHs (b) reacted with different glucose solutions from 0 to 13.2 mM, 26.4 mM, and back to 13.2 mM and 0 mM. (c) Hue circle with indicated hue values at corresponding positions. (d-e) Hue value changes of blue PCHs (d) and green PCHs (e) corresponding to changes in (a) and (b), respectively. (f) Hue value changes of blue PCHs during cyclic glucose response