2008
DOI: 10.1063/1.2976358
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Electrowetting on gold electrodes with microscopic three-dimensional structures for microfluidic devices

Abstract: To improve the performance of electrowetting-based microfluidic devices, we used micropillar structures to enhance the changes in the wettability of gold electrodes. The changes in the contact angle of a sessile drop were influenced by the diameter of the micropillars and interpillar distances. For a potential change between 0 V and −1.0 V, the change of the contact angle of the KCl sessile drop was 41°on a smooth electrode, but 88°on an electrode with micropillars with a 10 m diameter. Furthermore, the existe… Show more

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Cited by 16 publications
(18 citation statements)
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“…Wettability was also affected by pore size, with larger pore sizes 25 exhibiting less wetting. Based on the Young−Lippmann model, a modified equation was 26 proposed to express the force balance between absorbing and repelling at the pore walls. The 27 force balance model was established in terms of the height of a water droplet in the pore.…”
mentioning
confidence: 99%
“…Wettability was also affected by pore size, with larger pore sizes 25 exhibiting less wetting. Based on the Young−Lippmann model, a modified equation was 26 proposed to express the force balance between absorbing and repelling at the pore walls. The 27 force balance model was established in terms of the height of a water droplet in the pore.…”
mentioning
confidence: 99%
“…Imbibition under open-circuit conditions We started the imbibition experiment under open circuit conditions. Gold surfaces are hydrophilic when exposed in atmosphere, with a gold-water contact angle θ ∼ 70 • [39,40]. Therefore, once the electrolyte touches the NPG sample , it is spontaneously imbibed.…”
mentioning
confidence: 99%
“…Numerous phenomenological techniques exist for inducing fluid actuation, and techniques based on electroosmosis [7,8], electrowetting [9][10][11][12][13][14][15], dielectrophoresis [16][17][18], thermocapillary pumping [19,20], and photochemical actuation [21] have all been successfully demonstrated. The direct electrical actuation mechanisms listed here [7][8][9][10][11][12][13][14][15] are particularly intriguing since such processes can be implemented in digital architectures with underlying square electrode grids providing the digital actuation control structure.…”
Section: Introductionmentioning
confidence: 99%
“…The direct electrical actuation mechanisms listed here [7][8][9][10][11][12][13][14][15] are particularly intriguing since such processes can be implemented in digital architectures with underlying square electrode grids providing the digital actuation control structure. However, these single-layered techniques become increasingly challenging when implemented in complex two-dimensional digital systems.…”
Section: Introductionmentioning
confidence: 99%