Figure 1: A metal–ion-responsive adhesive material.
From: A metal–ion-responsive adhesive material via switching of molecular recognition properties

(a) Chemical structures of a metal–ion-responsive host gel (βCD–bpy gel) and a guest gel (tBu gel (x)). Here, x represents the mol% content of N-tBuAAm groups in the guest gel. (b) Schematic representation of the switching of molecular recognition property of βCD via inhibitory inclusion of bpy and its release by complexation to a metal ion. (c) Adhesion of the metal–ion-responsive host gel (βCD–bpy gel) to the guest gel (tBu gel (x)) induced by metal ions as chemical stimuli.