Low-Voltage Electro-Adhesion of Bipolar Polyelectrolyte Heterojunctions for Electrically Switchable Stiffness Modifier
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초록
내용
Electroadhesion, based on the electrostatic interaction between two oppositely charged surfaces, offers a simple method to modulate in-plane stiffness by electrically inhibiting the sliding of two materials. In this study, we demonstrate a low-voltage stiffness modifier using the electroadhesion of two oppositely charged polyelectrolytes. This modifier is capable of a 50-fold switch in in-plane stiffness at a potential level of 1 V. To demonstrate this stiffness modifier, two oppositely charged polyelectrolytes, coated on ITO/PET electrodes, are sandwiched by low-modulus elastomers. Under reverse bias, strong adhesion between the polyelectrolytes allows in-plane stiffness close to that of the ITO/PET substrate. Conversely, under forward bias, free sliding of substrate results in the modulus of the elastomers. By optimizing the system's compliance based on the fracture mechanics model, we can enhance in-plane force capacity to more than 10 N/cm2 at 1 V, the highest performance level in state-of-the-art electro-adhesives