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. Author manuscript; available in PMC: 2021 Apr 1.
Published in final edited form as: Adv Mater. 2019 Jul 4;32(13):e1901969. doi: 10.1002/adma.201901969

Figure 4.

Figure 4.

a) Schematic of bilayer hydrogel device that demonstrates temperature-triggered actuation and pH-responsive fluorescence. b) Host-guest interaction drives adhesion between the thermo-responsive hydrogel layer and the pH-responsive hydrogel layer. Reproduced with permission.[27] 2017, John Wiley and Sons.