Rheology
The rheological properties of the conductive hydrogel were analyzed using the Discovery HR-2 rheometer (TA Instruments, UK) with a Peltier plate. The measurements were performed at 25 °C, and the samples were allowed to reach equilibrium temperature for 60 s prior to each measurement. An aluminum plate-plate (20 mm, gap = 500 μm) was used and the shear viscosity was evaluated by increasing the shear rate from 0.1 to 1000 s−1 at 25 °C.