Enhancement of response speed of viscous fluids using overdrive voltage
Fast, identical response speeds over a full operating range are critical for electrowetting-driven devices such as liquid lenses, microswitches, and reflective displays. In this study, electrowetting actuation with overdrive signals is employed to reduce response time. We explore spreading behaviors...
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| Veröffentlicht in: | Sensors and actuators. B, Chemical Chemical, 2015-03, Vol.209, p.56-60 |
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| container_title | Sensors and actuators. B, Chemical |
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| creator | Chae, Jeong Byung Hong, Jiwoo Lee, Sang Joon Chung, Sang Kug |
| description | Fast, identical response speeds over a full operating range are critical for electrowetting-driven devices such as liquid lenses, microswitches, and reflective displays. In this study, electrowetting actuation with overdrive signals is employed to reduce response time. We explore spreading behaviors and response time (i.e., the time required to reach equilibrium radius) of electrowetted droplets under various DC and overdrive electrowetting actuation conditions. When the droplet is actuated by an overdrive electrical signal, response time is reduced to as low as 1/25 of the response time using a DC signal. We present a theoretical model that considers contact angle saturation and predicts spreading dynamics of droplets under DC and overdrive electrowetting actuation to within 5% error. Using only signal control, our proposed method can be used for multiple practical electrowetting-based applications without any modification of the current platform of electrowetting systems. |
| doi_str_mv | 10.1016/j.snb.2014.11.076 |
| format | Article |
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| fulltext | fulltext |
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| ispartof | Sensors and actuators. B, Chemical, 2015-03, Vol.209, p.56-60 |
| issn | 0925-4005 1873-3077 |
| language | eng |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Actuation Contact angle Digital microfluidics Droplets Dynamical systems Dynamics Electrowetting Mathematical models Overdrive actuaction Response time Spreading Spreading dynamics |
| title | Enhancement of response speed of viscous fluids using overdrive voltage |
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