Effects of Direction and Strength of External Electric Field on Particle Charging and Levitation under UV Irradiation
Effects of Direction and Strength of External Electric Field on Particle Charging and Levitation under UV Irradiation
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紫外辐射下外电场方向和强度对粒子荷电和悬浮的影响
DOI：
10.1109/ias48185.2021.9677386
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Shuji Matsusaka
中科院分区：
文献类型：
--
作者：
Mizuki Shoyama;Taiki Sugaya;Shuji Matsusaka
当粒子带电时，它们的运动可以通过静电力控制。在这项研究中，阐明了紫外线照射下电场中粒子的充电和运动。当沉积在绝缘基板上的颗粒层在向下的电场中用紫外光照射时，由光电发射产生的正电荷分布在颗粒层内。随后，通过反转电场方向，顶层的颗粒带正电并悬浮。悬浮粒子的通量随着电场强度的增加（向下和向上）而增加。随着向上电场强度的增加，悬浮区域中团聚粒子的数量增加，但粒子电荷减少。这些结果可以通过粒子悬浮机制来解释。
When particles are charged, their motion can be controlled by electrostatic forces. In this study, particle charging and motion in an electric field under UV irradiation were elucidated. When the particle layers deposited on an insulating substrate were irradiated with UV light in a downward electric field, positive charges generated by photoemission were distributed within the particle layers. Subsequently, by reversing the direction of the electric field, particles in the top layer were positively charged and levitated. The flux of the levitated particles increased with an increase in the strength of the electric field (downward and upward). The number of agglomerated particles in the levitation region increased but the particle charge decreased with an increase in the upward electric field strength. These results can be explained via the mechanism of particle levitation.