Surface tension determination through measurements of resonance oscillation of a small surface using dielectric force by a localized alternating current electric field
Surface tension determination through measurements of resonance oscillation of a small surface using dielectric force by a localized alternating current electric field
复制标题
通过局部交流电场使用介电力测量小表面的共振振荡来确定表面张力
作者：
TSUKAHARA;Satoshi; TSURUTA;Tsuyoshi; FUJIWARA;Terufumi
本研究提出了一种新的测量液体表面张力的显微镜方法，该方法通过测量小表面的受迫振荡来确定液体的表面张力，这种受迫振荡是由棒电极在交流电压下诱导的。将电极底部置于表面上方200μm处，在其下方产生较强的电场。介电常数大于空气的液体在介电力的作用下聚集在电极下方，从而使电极表面振荡。用强迫振动模型和二维圆形膜的振动模式成功地分析了这种振动。观察到了共振振荡，其频率与液体的表面张力与密度之比有很好的相关性。因此，所提出的新方法可用于测定已知密度的小表面的表面张力。
The present study proposed a novel microscope method for the determination of the surface tension of liquids through measurements of the forced oscillation of the small surface, which was induced with a rod electrode by applying an alternating current (ac) voltage. The electrode bottom was placed 200 μm above the surface, and a stronger electric field was generated under it. Liquids of a larger dielectric constant than air gathered under the electrode by a dielectric force, and thus the surface was oscillated. The oscillation was successfully analyzed with the forced oscillation model and the oscillation mode of two-dimensional circular membranes. A resonance oscillation was observed, the frequency of which was well related to the ratio of surface tension to density of the liquids. Therefore, the proposed novel method can be used for the determination of surface tensions of small surfaces with known densities.