Fig. 4: Shape reconfigurability and microstructure adaptability of PNIPAm ionogels.
From: Enormous-stiffness-changing polymer networks by glass transition mediated microphase separation
a Photographs showing the load-bearing capability and the shape reconfigurability of phase-separated PNIPAm ionogel. b Photographs showing the soft-to-hard transitional contact of PNIPAm ionogels. c Demonstration of the microstructure adaptability of PNIPAm ionogels. The semi-spherical pattern (left) and the ribbon pattern (right) were embossed by fixing the microstructure of substrate, which can be erased and recovered to the smooth original pattern (middle). d Schematic illustration of the microstructure adaptability of the ionogels. e The pull-off stress of ionogel on Cu electrode with Ra ≈ 4 μm. f Impedance of the ionogel/Cu system from 0.1 to 105 Hz. As a result, the impedance of ionogel/Cu system at 1 Hz reduced from 26.9 kΩ to 6.6 kΩ by eliminating the gaps at the interface (the inset micrograph shows the surface topography of Cu electrode with a roughness of Ra ≈ 4 μm, Supplementary Fig. 16).
