Simultaneous Analysis of High-Precision Electrostatic Charging on Particles Caused by Work Function with Electric Field Control and Particle Movement in Multiple Fields

本文从理论和实验两方面研究了一种通过与壁面反复接触来表征摩擦带电粒子的新方法。采用凝汽器模型计算了颗粒的电荷量。在实验中，粒子被喂到振动板上，可以在表面上运动，粒子上的电荷是用法拉第杯测量的。用带变焦镜头的高速摄像机观察了振荡板上的粒子行为。结果表明，粒子电荷随振动板上移动距离或粒子与壁接触次数的变化规律与理论一致，这是由与平衡和弛豫有关的两个参数决定的。研究还发现，粒子摩擦荷电可以很好地表征为外电场获得的参数值。

A new method for characterizing particles triboelectrically charged through repeated contact with a wall has been studied both theoretically and experimentally. The condenser model was applied to formulate the particle charging. In the experiment, particles that were fed on a vibration plate could travel on the surface, and the charge on the particles was measured using a Faraday cup. Particle behavior on the oscillating plate was observed using a high-speed camera with a zoom lens. It was found that the profile of particle charge as a function of distance travelled on the vibrating plate or the number of particle-wall contacts agreed well with the theoretical one, which is determined by two parameters related to equilibrium and relaxation. It was also found that particle tribocharging is well-characterized by the values of the parameters obtained by external electric fields.