We investigated the electrostatic interactions between particles acting through heterogeneous fluid phases. An oil lens system floating on the surface of water was used to trap particles at different fluid–fluid interfaces. The inner particles are located at the centrosymmetrically curved oil–water interface inside the oil lens while satellite particles are located at the curved air–water interface, separated by a particular distance from the triple phase boundary. The satellite particles are likely to be captured in an energy minimum state due to electrostatic repulsions by the inner particles balanced with the gravity-induced potential energy. As the size of the oil lens decreases upon evaporation, the satellite particles escape from the gravitational confinement at a critical moment. The self-potential values of the inner particles and the satellite particles were calculated by employing an energy balance and the experimentally obtained geometric parameter values. It was found that the self-potential values of the inner particles decrease as oil evaporates over time and that the magnitude of the self-potential of the satellite particles is a hundred times larger than that of the inner particles. These results demonstrate significant effects of the thickness and shape of the nonpolar superphase on the electrostatic interactions between the particles trapped at different fluid–fluid interfaces.

中文翻译：

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粒子之间通过非均质流体相的静电相互作用

我们研究了通过非均质流体相作用的粒子之间的静电相互作用。漂浮在水面上的油镜系统被用来捕获不同流体-流体界面处的颗粒。内部粒子位于油镜内部的中心对称弯曲的油水界面处，而卫星粒子位于弯曲的空气-水界面处，与三相边界相距特定距离。由于与重力感应的势能平衡的内部粒子的静电排斥，卫星粒子很可能以能量最小的状态被捕获。随着蒸发过程中油镜尺寸的减小，卫星颗粒在关键时刻从重力限制中逸出。通过利用能量平衡和实验获得的几何参数值来计算内部粒子和卫星粒子的自电位值。发现随着油随着时间的流逝，内部颗粒的自电势值降低，并且附属颗粒的自电势的大小比内部颗粒的自电势的大小大一百倍。这些结果证明了非极性超相的厚度和形状对截留在不同流体-流体界面的粒子之间的静电相互作用的显着影响。发现随着油随着时间的流逝，内部颗粒的自电势值降低，并且附属颗粒的自电势的大小比内部颗粒的自电势的大小大一百倍。这些结果证明了非极性超相的厚度和形状对截留在不同流体-流体界面的粒子之间的静电相互作用的显着影响。发现随着油随着时间的流逝，内部颗粒的自电势值降低，并且附属颗粒的自电势的大小比内部颗粒的自电势的大小大一百倍。这些结果证明了非极性超相的厚度和形状对截留在不同流体-流体界面的粒子之间的静电相互作用的显着影响。