论文标题
逆屈曲效应：弯曲的电场弯曲电场
Inverse flexoelectret effect: bending dielectrics by a uniform electric field
论文作者
论文摘要
非常需要发现一种机电耦合，该耦合使介电材料能够响应均匀的电场产生曲率，这将为设计执行器的设计增添新的自由度。柔韧性是偏振和应变梯度之间的双向耦合，是一个很好的候选者。但是由于其固有的尺寸依赖性，其应用通常仅限于纳米级。在这里，引入了硅酮弹性体中的逆挠性效应，以克服这一限制。基于这个想法，可以制造出一个可以在毫米长度上产生较大曲率的弯曲执行器，并证明具有与当前纳米级挠性执行器相当的良好致动性能。理论分析表明，新现象起源于elements和Maxwell应力的相互作用。这项工作为在执行器和灵活的电子设备中应用宏观灵活性开放了一条途径。
It is highly desirable to discover an electromechanical coupling that allows a dielectric material to generate curvature in response to a uniform electric field, which would add a new degree of freedom for designing actuators. Flexoelectricity, a two-way coupling between polarization and strain gradient, is a good candidate. But its applications are usually limited to the nanoscale due to its inherent size dependence. Here, an inverse flexoelectret effect in silicone elastomers is introduced to overcome this limitation. Based on this idea, a flexing actuator which can generate large curvature at the millimeter length scale is fabricated and shown to have excellent actuation performance comparable with current nanoscale flexoelectric actuators. Theoretical analysis indicates that the new phenomenon originates from the interplay of electrets and Maxwell stress. This work opens an avenue for applying macroscopic flexoelectricity in actuators and flexible electronics.
