振动作用下梯度浸润表面复合液滴的动态行为

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中图分类号：0552.6 文献标志码：A

Dynamic behavior of compound droplets on gradient wettability surfaces under vibration

HOUWenxuan，JIA Zhihai，ZHANGYaxin，NING Yuxuan （School ofEnergyandPowerEngineering，Universityof Shanghai forScienceandTechnology，Shanghai 2oo93，China）

Abstract： The dynamic behavior of compound droplets plays a significant role in improving the performance of products and devices in fields such as 3D printing，microfluidic control technologies， and coating techniques. In this work， micro-pillar gradient wettability surfaces were fabricated on polydimethylsiloxane （PDMS） substrate by using photolithography. The dynamic behavior of compound droplets containing air bubbles on the gradient wettability surface under vibration was investigated. The results reveal that when the air bubble is located at the front of the droplet， the front contact angle of the droplet increases， which favors the spreading of the droplet. Conversely， when the bubble is at the rear of the droplet， it increases the rear contact angle， which inhibits the spreading of the droplet. Additionally， when the droplet is subjected to vibrations with different frequency and amplitude， the greatest deformation and the largest maximum spreading factor are obtained at the resonance frequency. As the vibration frequency deviates from the resonance frequency， the maximum spreading factor gradually decreases. Finally， it is found that bubble size has a suppressive effect on droplet deformation.For a given size of droplet， as the bubble size increases， the deformation extent of the droplet weakens， and the maximum spreading factor decreases. Moreover， when the bubble size remains constant， with the increase of the droplet size，the maximum spreading factor first increases and then decreases.

Keywords： compound droplet； gradient wettbility surface; spreading； bubble； vibration

复合液滴在工业领域中普遍存在[1-2]。（剩余13181字）