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Corona enhanced electrowetting and dielectrophoresis in a dielectric fluid

Corona enhanced electrowetting and dielectrophoresis in a dielectric fluid

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Info

Original languageEnglish
TitleICPASM 2005: Proceedings of the 8th International Conference on Properties and Applications of Dielectric Materials, Vols 1 and 2
Place of publicationNEW YORK
PublisherIEEE Computer Society
Publication date2006
Pages865-868
Number of pages4
ISBN (Print)1-4244-0189-5
StatePublished

Conference

ConferenceIEEE 8th International Conference on Properties and Applications of Dielectric Materials
CountryIndonesia
CityDenpasar, Bali
Period26/06/0630/06/06

Abstract

The response to a step voltage of a system comprising a needle-like upper electrode partially immersed in dielectric oil, and a bottom flat electrode has been analysed. The fluid meniscus at the oil-air interface around needle electrode rises up when a voltage is applied and drops down on switch off with characteristic time constants. In the case where the interface has been charged by corona. spraying, after the voltage is switched off and the meniscus has decayed, a secondary lift of the fluid occurs, which raises the fluid to a higher level than before. This is connected to the relaxation of the surface charges and it is present only when corona injection exists. Surprisingly, the system reacts in a similar way when a very low frequency is applied. In this case the fluid can rise to twice the height of that in the DC case.

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