https://scholars.lib.ntu.edu.tw/handle/123456789/630576
標題: | Evaporation-driven directed motion of droplets on the glass | 作者: | Nuthalapati, Karthik YU-JANE SHENG Tsao, Heng Kwong |
關鍵字: | Directed motion | Droplet transportation | Marangoni stress | Self-propulsion | Silwet-laden droplet | 公開日期: | 1-六月-2023 | 卷: | 38 | 來源出版物: | Surfaces and Interfaces | 摘要: | Manipulating and guiding the droplet movement on a substrate by vapor-mediated actuation is a new approach for microfluidic devices. In this work, the evaporation-driven self-propulsion of the droplets such as N,N-dimethylacetamide, and N-methylformamide on the glass is demonstrated. By the addition of the Silwet surfactant, the aforementioned liquids change from total wetting to partial wetting and the two-component droplet is formed on the glass. The random walk behavior of the droplet can be directed by the linear and octagonal runways on a substrate, of which both hydrophobic sides are constructed by the polysilazane coating. The long-range transport of the droplet is observed, and the effect of the Silwet concentration on the self-propelled velocity is examined. Finally, the evaporation-driven mechanism is investigated by employing the open and closed environments for one-droplet and two-droplet systems. It is found that the self-propelled behavior of Silwet-laden droplets vanishes in the closed environment. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/630576 | ISSN: | 24680230 | DOI: | 10.1016/j.surfin.2023.102811 |
顯示於: | 化學工程學系 |
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