Piezoionic characterization of poly(acrylic acid-co-acrylamide) hydrogels assisted by 3D-printed molds
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초록
내용
Polymer hydrogels containing electrolytes can generate streaming potential upon deformation when the diffusion characteristics of the electrolytes differ significantly. Combined with the flexibility and transparency of these hydrogels, the pressure-induced (or, piezoionic) activation makes polyelectrolyte hydrogels ideal sensing material to mimic natural skins. The piezoionic response and its relaxation can be controlled by the shape and the composition of the polymer networks used. We developed 3D-printed molds to standardize the piezoionic measurements by systematically varying the geometry of hydrogels while allowing stable contact with the reference electrodes. We discuss the optimal geometry for the piezoionic characterization in terms of the gel thickness, the indentation dimension, the spacing between the electrodes, and the state of deformation as well as the effects of charge immobilization into the network (as in neutralized polyacrylic acid).