Electro-osmotic flow enhancement over superhydrophobic surfaces

Dehe, Sebastian; Rofman, Baruch; Bercovici, Moran; Hardt, Steffen

doi:10.1103/physrevfluids.5.053701

Cited by 20 publications

(13 citation statements)

References 66 publications

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“…The superhydrophobic surface leads to large slip lengths with the micrometer range, [ 196–199 ] offering the possibility to considerably enhance the electroosmosis flow. [ 200,201 ] It has been shown that in the regime of a thin Debye layer, an order of magnitude enhancement in velocity and complete pH independence is obtained for electroosmosis on superhydrophobic surfaces with a nonvanishing charge at the liquid‐gas interface. However, the composite structure of the superhydrophobic interface, involving both solid‐gas and liquid‐gas interfaces, makes these transport mechanisms far more complex in this case than on a smooth interface.…”

Section: Discussionmentioning

confidence: 99%

Electrohydrodynamic and Hydroelectric Effects at the Water–Solid Interface: from Fundamentals to Applications

Song

et al. 2020

Adv Materials Inter

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Electrohydrodynamic and hydroelectric effects at the water–solid interface are of fundamental importance and also underpin many important applications ranging from the controlled liquid transport by applying an external electric field to the power generation from moving liquid. Also, recent advances in micro/nanofabrication and nanomaterials provide additional dimension and flexibility in controlling electrohydrodynamic and hydroelectric effects at the water–solid interface to achieve preferred functions. Despite extensive progress, the cohesive and unified review of these two largely opposite effects is currently lacking. This review first discusses the important common foundations underpinning these two effects such as contact electrification and electric double layer (EDL), then takes a parallel approach to elaborate the electrohydrodynamic processes such as electrically induced liquid flow, wetting, and droplet motion, as well as the hydroelectricity resulting from their opposite processes. The practical applications and the unsolved challenges related to these two interfacial effects are also highlighted.

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Section: Discussionmentioning

confidence: 99%

Electrohydrodynamic and Hydroelectric Effects at the Water–Solid Interface: from Fundamentals to Applications

Song

et al. 2020

Adv Materials Inter

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“…2020; Dehe et al. 2020). Both the voltage at the gate electrodes as well as the driving field are oscillatory, and thus a time-averaged flow can be induced.…”

Section: Flow In a Hele-shaw Cellmentioning

confidence: 99%

“…2019 a ; Dehe et al. 2020). The boundaries at the perimeter of the cell are assumed to be periodic in the -direction, with no-penetration boundaries in the -direction.…”

Section: Comparison Between 3-d and 2-d Numerical Computationsmentioning

confidence: 99%

“…It was shown both theoretically by Squires (2008) and experimentally (Dehe et al. 2020) that the electroosmotic velocity over a structured superhydrophobic surface depends on the ratio of the slip length and the thickness of the electric double layer. If applicable, this dependence needs to be incorporated into the electroosmotic mobility field.…”

Section: Flow In a Hele-shaw Cellmentioning

confidence: 99%

“…2021) or microstructured surfaces (Dehe et al. 2020). In a recent publication, this principle was utilized to sort particles by their respective diffusivity (Bacheva et al.…”

Section: Introductionmentioning

confidence: 99%

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Hydrodynamic dispersion in Hele-Shaw flows with inhomogeneous wall boundary conditions

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Simple Electroosmotic Pump and Active Microfluidics with Asymmetrically Coated Microelectrodes

et al. 2023

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Electroosmotic pumps can deliver liquid without moving parts, making them suitable for microfluidic and lab‐on‐chip systems. Previously, alternating current electroosmotic pumps were constructed using pairs of coplanar asymmetrical interdigitated microelectrodes on the same substrate. In this work, a simpler micropumping system is developed, separating the electrodes on two substrates and breaking the symmetry by half‐depositing electrodes with 3D microstructures. Numerical simulation models of the pumping system and experimental velocity profiles are used to explain the fluid motion mechanism and structure‐dependent pumping performance. In addition to its efficiency and simplicity, this new pumping system also allows for the creation of a microvortex device and an active microfluidics device. This scalable micropumping system provides a way to pump liquids at microscopic or macroscopical scale in complex microfluidics systems.

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Electro-osmotic flow enhancement over superhydrophobic surfaces

Cited by 20 publications

References 66 publications

Electrohydrodynamic and Hydroelectric Effects at the Water–Solid Interface: from Fundamentals to Applications

Electrohydrodynamic and Hydroelectric Effects at the Water–Solid Interface: from Fundamentals to Applications

Hydrodynamic dispersion in Hele-Shaw flows with inhomogeneous wall boundary conditions

Simple Electroosmotic Pump and Active Microfluidics with Asymmetrically Coated Microelectrodes

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