An enhanced macroscopic inverse flexoelectric-like response in flexoelectrets

Abstract

Flexoelectricity allows a dielectric material to bend in response to a uniform electric field, and adds a new degree of freedom for designing actuators. However, its applications are usually limited to the nanoscale due to its inherent size effect. Here, we report an enhanced macroscopic flexoelectric-like response in flexoelectrets (soft elastomers with embedded charges), showing excellent actuation performance comparable with nanoscale flexoelectric actuators. Theoretical analysis indicates that the symmetry breaking of Maxwell stress is the cause of this enhancement. This work opens an avenue for applying macroscopic flexoelectricity in actuators and flexible electronics.