Study on the Electret Film Crumpling Deformation Theory and Flexoelectric-Like Responses
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摘要: 现有挠曲电俘能器存在俘能方式单一、力电耦合系数偏小，且仅在微观尺度显著等问题，难以在宏观尺度上实现高效的能量转换. 驻极体作为一种内嵌电荷的介电材料，其非均匀变形可诱导显著的类挠曲电响应. 薄膜揉皱作为一种双向收缩的复杂变形，其高应变梯度为宏观尺度下高效俘能提供了新方式. 该文将驻极体宏观尺度下的强力电耦合特性与揉皱的高应变梯度优势相结合，建立了驻极体薄膜揉皱变形理论，基于该模型分析了不同电荷密度、支撑杯半径、薄膜厚度、放缩尺度下揉皱驻极体的类挠曲电响应及能量俘获特性. 结果表明，对于厚度为1 mm的驻极体薄膜，当电荷密度q=-0.2 mC · m-2时，有效类挠曲电强度相比纯聚二甲基硅氧烷(PDMS)薄膜的本征挠曲电效应高了近两个数量级.Abstract: The flexoelectric energy harvesters face such challenges as the monotonous energy harvesting mode, the low electromechanical coupling coefficient, the only prominent effect on microscales, and the limited energy conversion efficiency on macroscales. The electret, as a dielectric material with embedded charges, exhibits significant flexoelectric-like responses induced by non-uniform deformation. The crumpled film in complex bidirectional contraction, provides a novel efficient energy harvesting approach due to high strain gradients on macroscales. Herein the strong macroscopic electromechanical coupling properties of electrets were combined with the advantageous high strain gradients of crumpling, to establish a deformation theory for crumpled flexoelectret films. Based on this model, the flexoelectric-like responses and energy harvesting characteristics of crumpled flexoelectret films were analyzed for different charge densities, supporting cup radii, film thicknesses, and scales. The results indicate that, for a 1 mm thick flexoelectret film, the effective flexoelectric-like intensity is 2 orders higher than that of the intrinsic flexoelectric effect of the pure PDMS film, with the charge density q=-0.2 mC · m-2.
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Key words:
- electret film /
- crumpling deformation /
- flexoelectric-like response /
- energy harvesting
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图 4 感应有效电压与无量纲尖端挠度的关系
注 为了解释图中的颜色，读者可以参考本文的电子网页版本，后同.
Figure 4. The induced effective voltage vs. the dimensionless tip deflection
图 5 感应有效电压与支撑杯半径的关系
Figure 5. The induced effective voltage vs. the radius of the support cup
图 6 各关键参数与无量纲尖端挠度的关系
Figure 6. The relationships between the key parameters and the dimensionless tip deflections
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