Journal
PROCEEDINGS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
Volume 468, Issue 2145, Pages 2485-2495Publisher
ROYAL SOC
DOI: 10.1098/rspa.2011.0679
Keywords
electro-elasto-capillarity; elasto-capillarity; frequency doubling; electrowetting on a moving substrate
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Funding
- National Natural Science Foundation of China (NSFC) [11072244]
- Key Research Program of the Chinese Academy of Sciences [KJZD-EW-M01]
- Instrument Developing Project of the Chinese Academy of Sciences [Y2010031]
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Electro-elasto-capillarity (EEC) is a new method of droplet encapsulation controlled by an electric field. In this paper, we report some experiments, for the first time, to realize EEC under a dynamic electric field, showing the progress of electrowetting on a moving substrate. We employ the combined effects of surface tension, elastic force and Coulomb force to manipulate the flexible thin film to encapsulate and release a tiny droplet in a controllable and reversible manner. An alternating current electric field is applied to actuate the droplet and film to vibrate, as if they are dancing to a melody. We measured the frequency of the droplet and the film vibration and found that it was twice the input signal; we also carried out frequency analysis experiments. The frequency-doubling phenomenon can be explained theoretically. Our findings may offer a practical method for drug encapsulation and for the actuation of microelectromechanical system devices.
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