In order to explore the mechanism of electronically controlled regulation of interfacial wetting behavior and grasp the influence law of electric field regulation

based on the principle of minimum energy and the principle of constant droplet volume

electro wetting equivalent model under multi-factors coupling is established systematically. The influence of load voltage

polarity and frequency chamge on wetting characteristics of Na Cl droplets on the surface of parylene films is compared and analyzed. The results of theoretical analysis and experimental tests show that the contact angle decreases parabolically and nonlinearly with the increase of voltage in the range of 0～ ± 70 V

whether applied positive voltage or negative voltage until saturation and is about 95. 3°.However

the asymmetry of the parabola will change due to the difference of the ion volume of droplets in the process of positive and negative loading

which the difference is about 10 V. When AC electric field is applied

the higher the frequency

the smaller the contact angle is

in the range of 50～ 250 Hz. At the same time

the saturated voltage will decrease in reverse with the increase of frequency. This study provides theoretical reference and experimental basis for exploring the regulation mechanism of dielectric wetting system and guiding the application of electric wetting effect in practical engineering.