Flexoelectricity is a universal electromechanical effect in dielectric materials, describing strain gradient-induced electric polarization, of which, significant research has been performed for solid dielectrics and liquid crystals. Flexoelectricity of non-oriented liquids may have an impact on the research of bioelectronics, programmed droplets, energy harvesting and ionotronic devices, but it is not accessible for research due to a lack of theory and experimental approaches. In this work, flexoelectricity in non-oriented liquids is theoretically predicted and obtained by applying a shear strain gradient and the flexoelectric response of several types of liquids are demonstrated. Shear strain gradient of liquids is applied with a special-designed geometry and loaded by cyclic rotation from the chamber and the induced electric polarization is measured for flexoelectric coefficients. Experiments are designed and the shear flexoelectric response of non-oriented dielectric liquid materials are theoretically estimated and experimentally verified. This work opens the field of research for flexoelectricity in general non-oriented liquids and highlights the electromechanical properties of liquid materials.

柔性电是介电材料中的一种普遍的机电效应，描述了应变梯度引起的极化，其中，对固态介电体和液晶已进行了大量研究。无方向性液体的柔电性可能会影响生物电子学，程控液滴，能量收集和电离电子设备的研究，但由于缺乏理论和实验方法，因此无法进行研究。在这项工作中，通过应用剪切应变梯度从理论上预测并获得了非取向液体的柔电性，并论证了几种液体的柔电响应。液体的剪切应变梯度具有特殊设计的几何形状，并通过从腔室循环旋转来加载，并测量感应电极化的挠电系数。设计了实验，并对无取向介电液体材料的剪切挠曲电响应进行了理论估计和实验验证。这项工作开辟了普通非定向液体中的柔性电的研究领域，并突出了液体材料的机电性能。