Trampolining of Droplets on Hydrophobic Surfaces Using Electrowetting
Droplet detachment from solid surfaces is an essential part of many industrial processes. Electrowetting is a versatile tool for handling droplets in digital microfluidics, not only on plain surface but also in 3-D manner. Here, we report for the first time droplet trampolining using electrowetting....
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-02-01
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| Series: | Micromachines |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2072-666X/13/3/345 |
| _version_ | 1827627622193954816 |
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| author | Zhantao Wang Xiaojuan Liu Li Wang Cunlu Zhao Danfeng Zhou Jiazheng Wei |
| author_facet | Zhantao Wang Xiaojuan Liu Li Wang Cunlu Zhao Danfeng Zhou Jiazheng Wei |
| author_sort | Zhantao Wang |
| collection | DOAJ |
| description | Droplet detachment from solid surfaces is an essential part of many industrial processes. Electrowetting is a versatile tool for handling droplets in digital microfluidics, not only on plain surface but also in 3-D manner. Here, we report for the first time droplet trampolining using electrowetting. With the information collected by the real-time capacitor sensing system, we are able to synchronize the actuation signal with the spreading of the droplet upon impacting. Since electrowetting is applied each time the droplet impacts the substrate and switched off during recoiling of the droplet, the droplet gains additional momentum upon each impact and is able to jump higher during successive detachment. We have modelled the droplet trampolining behavior with a periodically driven harmonic oscillator, and the experiments showed sound agreement with theoretical predictions. The findings from this study will offer valuable insights to applications that demands vertical transportation of the droplets between chips arranged in parallel, or detachment of droplets from solid surfaces. |
| first_indexed | 2024-03-09T13:18:40Z |
| format | Article |
| id | doaj.art-9d5a2ea955ec4620af637d8fa17c7b94 |
| institution | Directory Open Access Journal |
| issn | 2072-666X |
| language | English |
| last_indexed | 2024-03-09T13:18:40Z |
| publishDate | 2022-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Micromachines |
| spelling | doaj.art-9d5a2ea955ec4620af637d8fa17c7b942023-11-30T21:32:43ZengMDPI AGMicromachines2072-666X2022-02-0113334510.3390/mi13030345Trampolining of Droplets on Hydrophobic Surfaces Using ElectrowettingZhantao Wang0Xiaojuan Liu1Li Wang2Cunlu Zhao3Danfeng Zhou4Jiazheng Wei5School of Mechanical & Electronic Engineering, Zhongshan Polytechnic, Zhongshan 528400, ChinaSchool of Mechanical & Electronic Engineering, Zhongshan Polytechnic, Zhongshan 528400, ChinaSchool of Information Engineering, Zhongshan Polytechnic, Zhongshan 528400, ChinaKey Laboratory of Thermo-Fluid Science and Engineering of MOE, Xi’an Jiaotong University, Xi’an 710049, ChinaMaglev Engineering Center, National University of Defense Technology, Changsha 410073, ChinaSchool of Mechanical & Electronic Engineering, Zhongshan Polytechnic, Zhongshan 528400, ChinaDroplet detachment from solid surfaces is an essential part of many industrial processes. Electrowetting is a versatile tool for handling droplets in digital microfluidics, not only on plain surface but also in 3-D manner. Here, we report for the first time droplet trampolining using electrowetting. With the information collected by the real-time capacitor sensing system, we are able to synchronize the actuation signal with the spreading of the droplet upon impacting. Since electrowetting is applied each time the droplet impacts the substrate and switched off during recoiling of the droplet, the droplet gains additional momentum upon each impact and is able to jump higher during successive detachment. We have modelled the droplet trampolining behavior with a periodically driven harmonic oscillator, and the experiments showed sound agreement with theoretical predictions. The findings from this study will offer valuable insights to applications that demands vertical transportation of the droplets between chips arranged in parallel, or detachment of droplets from solid surfaces.https://www.mdpi.com/2072-666X/13/3/345droplettrampoliningelectrowettingcapacitor sensor |
| spellingShingle | Zhantao Wang Xiaojuan Liu Li Wang Cunlu Zhao Danfeng Zhou Jiazheng Wei Trampolining of Droplets on Hydrophobic Surfaces Using Electrowetting Micromachines droplet trampolining electrowetting capacitor sensor |
| title | Trampolining of Droplets on Hydrophobic Surfaces Using Electrowetting |
| title_full | Trampolining of Droplets on Hydrophobic Surfaces Using Electrowetting |
| title_fullStr | Trampolining of Droplets on Hydrophobic Surfaces Using Electrowetting |
| title_full_unstemmed | Trampolining of Droplets on Hydrophobic Surfaces Using Electrowetting |
| title_short | Trampolining of Droplets on Hydrophobic Surfaces Using Electrowetting |
| title_sort | trampolining of droplets on hydrophobic surfaces using electrowetting |
| topic | droplet trampolining electrowetting capacitor sensor |
| url | https://www.mdpi.com/2072-666X/13/3/345 |
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