Abstract
A few microliters of oil and aqueous solution with same density encapsulated in a cylinder forms a spherical interface. In this paper, the frequency characteristics of the basic oscillation mode at the liquid-liquid interface inside the electrowetting lens is obtained by using the light flux measurement. It is found that the intrinsic frequency of the basic oscillation mode at the liquid-liquid interface changes accordingly with the amplitude of applied voltage, while the displacement of the center of the interface decreases with the increase of frequency. This work provides guiding for optimizing driving of the electrowetting liquid lens and other related microfluidic devices, and is also helpful to the study of forced oscillation of capillary wave in a cylinder.
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