Two Liquids Wetting and Low Hysteresis Electrowetting on Dielectric Applications

Maillard, Mathieu; Legrand, Julien; Berge, B.

doi:10.1021/la901806g

Cited by 17 publications

(20 citation statements)

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“…We neither used a fluoropolymer film [33,34] nor a silica-based sol-gel layer [35][36][37][38] in order to increase hydrophobicity, which made the device technology considerably simpler. This has been possible since, in our case, the dye makes the oil slightly polar [39].…”

Section: Introductionmentioning

confidence: 92%

Microfluidic Optical Shutter Flexibly x-y Actuated via Electrowetting-on-Dielectrics with <20 ms Response Time

Fouckhardt

Strassner

Heisel

et al. 2017

Advances in Optical Technologies

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Tunable microoptics deals with devices of which the optical properties can be changed during operation without mechanically moving solid parts. Often a droplet is actuated instead, and thus tunable microoptics is closely related to microfluidics. One such device/module/cell type is an optical shutter, which is moved in or out of the path of the light. In our case the transmitting part comprises a moving transparent and electrically conductive water droplet, embedded in a nonconductive blackened oil, that is, an opaque emulsion with attenuation of 30 dB at 570 nm wavelength over the 250 m long light path inside the fluid (15 dB averaged over the visible spectral range). The insertion loss of the cell is 1.5 dB in the "open shutter" state. The actuation is achieved via electrowetting-on-dielectrics (EWOD) with rectangular AC voltage pulses of 2 ⋅ 90 V peak-to-peak at 1 kHz. To flexibly allow for horizontal, vertical, and diagonal droplet movement in the upright x-y plane, the contact structures are prepared such that four possible stationary droplet positions exist. The cell is configured as two capacitors in series (along the axis), such that EWOD forces act symmetrically in the front and back of the 60 nl droplet with a response time of <20 ms.

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Section: Introductionmentioning

confidence: 92%

Microfluidic Optical Shutter Flexibly x-y Actuated via Electrowetting-on-Dielectrics with <20 ms Response Time

Fouckhardt

Strassner

Heisel

et al. 2017

Advances in Optical Technologies

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“…(1)~(3), (6) and (7), and a differential equation, which determines the shape of the liquid interface, can be obtained:…”

Section: Analysis and Fitting Of Interface Shape Of Double-liquidmentioning

confidence: 99%

“…The liquid lens has the advantage of being able to change focal length without mechanically moving the lens, which can provide considerable power savings and can eliminate wear associated with moving parts [1], so it is widely used in a large variety of application areas, such as mobile phones [2], surgical instruments [3], miniature cameras [4], and so on. The doubleliquid lens [4][5][6][7] based on the electrowetting effect is highly regarded because of its outstanding performance [7].…”

Section: Introductionmentioning

confidence: 99%

Effect of the Liquid Density Difference on Interface Shape of Double-Liquid Lens

Kong¹,

Zhu²,

Chen³

et al. 2016

Journal of the Optical Society of Korea

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The effect of the liquid density difference on interface shape of a double-liquid lens is analyzed in detail. The expressions of interface shape of two liquids with liquid density difference are analyzed and fitted with "even asphere". The imaging analysis of the aspheric interface shape of a double-liquid lens is presented. The results show that the density difference of two liquids can cause the interface to be an aspheric surface, which can improve the image quality of a double-liquid lens. The result provides a new selection for the related further research and a wider application field for liquid lenses.

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“…The reduction in CAH in the case of AC eld is due to the time dependent electrostatic de-pinning force at the three phase contact line. 26,27 We have investigated EW response on PS dielectric surface for water droplets in the presence of silicone oil for several voltage cycles. Moreover, saturation in contact angle is not yet satisfactorily answered.…”

Section: Introductionmentioning

confidence: 99%

Hysteretic DC electrowetting by field-induced nano-structurations on polystyrene films

et al. 2015

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Electrowetting (EW) offers executive wetting control of conductive liquids on several polymer surfaces. We report a peculiar electrowetting response for aqueous drops on a polystyrene (PS) dielectric surface in the presence of silicone oil. After the first direct current (DC) voltage cycle, the droplet failed to regain Young's angle, yielding contact angle hysteresis, which is close to a value found in ambient air. We conjecture that the hysteretic EW response appears from in situ surface modification using electric field induced water-ion contact with PS surface inducing nano-structuration by electro-hydrodynamic (EHD) instability. Atomic force microscopy confirms the formation of nano-structuration on the electrowetted surface. The effects of molecular weight, applied electric field, water conductivity and pH on nano-structuration are studied. Finally, the EW based nano-structuration on PS surface is used for the enhanced loading of aqueous dyes on hydrophobic surfaces.

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Two Liquids Wetting and Low Hysteresis Electrowetting on Dielectric Applications

Abstract: In the last sentence of the first paragraph of the Introduction, "high electric field" should be "high electric field 10 ".

Cited by 17 publications

References 0 publications

Microfluidic Optical Shutter Flexibly x-y Actuated via Electrowetting-on-Dielectrics with <20 ms Response Time

Microfluidic Optical Shutter Flexibly x-y Actuated via Electrowetting-on-Dielectrics with <20 ms Response Time

Effect of the Liquid Density Difference on Interface Shape of Double-Liquid Lens

Hysteretic DC electrowetting by field-induced nano-structurations on polystyrene films

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