How Electrostatic Fields Change Contact Angle in Electrowetting

Kang, Kwan Hyoung

doi:10.1021/la0263615

Cited by 299 publications

(279 citation statements)

References 21 publications

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“…The mechanism for force generation in the direction horizontal to the interface has been clarified by other researchers. [19][20][21] Also, dependence of the performance on physical parameters has been analyzed by Ren and co-workers. 22 The driving voltage V needed to mobilize a liquid can be approximated as follows: 6 …”

Section: Principle Of Operationmentioning

confidence: 99%

Microfluidic transport based on direct electrowetting

Satoh

Loughran

Suzuki

2004

Journal of Applied Physics

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Access to the full text of the published version may require a subscription. An integrated microfluidic system was fabricated which functions by deliberately manipulating interfacial tension. A distinctive characteristic of our system is the use of an array of adjacent, elongated, working electrodes and protruding polydimethylsiloxane open-flow channels. Microfluidic transport was realized directly on the bare gold electrode surface in the absence of an additional dielectric layer. By changing the potential of the working electrode to a negative potential, a liquid column could be transported from one end of an elongated working electrode to the other end. Transport of the liquid column could be altered without any valves by switching on the adjacent electrode in a given direction. The flow velocity depended on the applied potential, i.e., the velocity could be altered by deliberate manipulation of the electrode potential. In addition, the flow velocity increased as the dimensions of the flow channel decreased. The applied voltage was less than 2 V, and the power consumption was in the order of tens of W. Rights

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Section: Principle Of Operationmentioning

confidence: 99%

Microfluidic transport based on direct electrowetting

Satoh

Loughran

Suzuki

2004

Journal of Applied Physics

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“…Its effect is just to locate the contact angle around the contact line and its influence distance from the contact line only approximately equals the thickness of the dielectric layer [8,29,30]. As the contact angle studied in this paper is at the macroscopic scale, the approach to minimize the free energy of the system is also used to extend the electrowetting equation to rough surfaces.…”

Section: Extended Electrowetting Equationmentioning

confidence: 99%

An Electrowetting Model for Rough Surfaces Under Low Voltage

Dai¹,

Zhao²

2008

Journal of Adhesion Science and Technology

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Electrowetting is one of the most effective methods to enhance wettability. A significant change of contact angle for the liquid droplet can result from the surface microstructures and the external electric field, without altering the chemical composition of the system. During the electrowetting process on a rough surface, the droplet exhibits a sharp transition from the Cassie-Baxter to the Wenzel regime at a low critical voltage. In this paper, a theoretical model for electrowetting is put forth to describe the dynamic electrical control of the wetting behavior at the low voltage, considering the surface topography. The theoretical results are found to be in good agreement with the existing experimental results.  Koninklijke Brill NV, Leiden, 2008

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“…Biesheuvel [6] obtained electrostatic free energy considering chemical work together with electrical work. On the other hand, Jones [7] and Kang [8] used the electromechanical approach to derive the Lippmann equation. Kang et al [9] extended the theory for an aqueous electrolyte system with a finite thickness of electrical double layer.…”

Section: Introductionmentioning

confidence: 99%

Ion size effects on the osmotic pressure and electrocapillarity in a nanoslit: Symmetric and asymmetric ion sizes

Rajni

Kang

2016

Phys. Rev. E

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We analyze the effect of asymmetric finite ion size in nanoconfinement in the view of osmotic pressure and electrocapillarity. When the confinement width becomes comparable with the Debye length, the overlapped electric double layer is significantly deformed by the steric effects. We derive the osmotic pressure from the modified Poisson-Boltzmann equation in a nanoslit to examine the deviation from the ideal osmotic pressure and the repulsive force on the wall considering the asymmetry of ion sizes. Then the electrocapillarity due to the steric effect is investigated under constant potential condition with the flat interface assumption. Later, the deformation by the electrocapillarity is also considered in the first order approximation.

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How Electrostatic Fields Change Contact Angle in Electrowetting

Cited by 299 publications

References 21 publications

Microfluidic transport based on direct electrowetting

Microfluidic transport based on direct electrowetting

An Electrowetting Model for Rough Surfaces Under Low Voltage

Ion size effects on the osmotic pressure and electrocapillarity in a nanoslit: Symmetric and asymmetric ion sizes

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