Fig. 1: Design and realization of DMCS-hydrogel.
From: Design of large-span stick-slip freely switchable hydrogels via dynamic multiscale contact synergy
a The sticky and slippery switching mechanism of DMCS-hydrogel via dynamic multiscale contact synergy originating from the dynamic meso-topography and micro-conformation. E: elastic modulus, R: roughness. b Schematic diagram of meso-scale contact and micro-scale contact. Left, dynamic meso-contact via roughness and modulus change of soft adhesive materials. Right, dynamic micro-contact based on the activation and deactivation of adhesive groups. L0, L1, L2: distance between hydrogel surface and substrate; S0, S1, S2: contact area between hydrogel surface and substrate. c The synergistic regulation of dynamic micro- and meso-scale contact. The effect of adhesive components (PDMA) (d), material modulus (e), and smart components (PNIPAAm) (f) on adhesion strength. g The sticky and slippery state of the DMCS-hydrogels against iron sheet at high and low temperatures. Photographs (h) and nominal stress versus stretch curve (i) of the DMCS-hydrogel, stretched to more than 7 times its original length. The hydrogel was colored with Rhodamine B for visualization. Error bars represent the standard deviation from at least three replicates. Data in d, e, and f are presented as mean values ± SD. λ stretch.
