Experimental characterization of induction electrohydrodynamics for integrated microchannel pumping

Iverson, Brian D.; Garimella, Suresh V.

doi:10.1088/0960-1317/19/5/055015

Cited by 16 publications

(6 citation statements)

References 35 publications

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“…At the microscale, however, they often suffer from mechanical failure due to fouling or loss in membrane elasticity. 16 Kinetic pumps convert kinetic sources such as electromagnetic, thermal or chemical energy into fluid momentum to drive flow. Common types of kinetic pumps include electrohydrodynamic, 17 electrokinetic, 18 magnetohydrodynamic, 19 thermomagnetic, 20 electro wetting, 21 electrothermal, 22 and electrochemical.…”

Section: Introductionmentioning

confidence: 99%

Microfluidic pumping, routing and metering by contactless metal-based electro-osmosis

Mavrogiannis

Doria

et al. 2015

Lab Chip

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Over the past decade, many microfluidic platforms for fluid processing have been developed in order to perform on-chip fluidic manipulations. Many of these methods, however, require expensive and bulky external supporting equipment, which are not typically applicable for microsystems requiring portability. We have developed a new type of portable contactless metal electro-osmotic micropump capable of on-chip fluid pumping, routing and metering. The pump operates using two pairs of gallium metal electrodes, which are activated using an external voltage source, and separated from a main flow channel by a thin micron-scale PDMS membrane. The thin contactless membrane allows for field penetration and electro-osmotic (EO) flow within the microchannel, but eliminates electrode damage and sample contamination commonly associated with traditional DC electro-osmotic pumps that utilize electrodes in direct contact with the working fluid. The maximum flow rates and pressures generated by the pump using DI water as a working buffer are 10 nL min(-1) and 30 Pa, respectively. With our current design, the maximum operational conductivity where fluid flow is observed is 0.1 mS cm(-1). Due to the small size and simple fabrication procedure, multiple micropump units can be integrated into a single microfluidic device for automated on-chip routing and sample metering applications. We experimentally demonstrated the ability to quantify micropump electro-osmotic flowrate and pressure as a function of applied voltage, and developed a mathematical model capable of predicting the performance of a contactless micropump for a given external load and internal hydrodynamic microchannel resistance. Finally, we showed that by activating specific pumps within a microchannel network, our micropumps are capable of routing microchannel fluid flow and generating plugs of solute.

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Section: Introductionmentioning

confidence: 99%

Microfluidic pumping, routing and metering by contactless metal-based electro-osmosis

Mavrogiannis

Doria

et al. 2015

Lab Chip

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“…Electrohydrodynamics (EHDs) has been acquiring unprecedentedly increasing attention from the microfluidic community since the last two decades [4][5][6]. Traditional DC electroosmosis (EO) [7,8], electrowetting on dielectrics [9], injection EHD [10], conduction EHD [11], traveling-wave induction EHD [12][13][14][15], inducedcharge electroosmosis (ICEO) [16][17][18][19][20][21][22][23][24], dielectrophoresis (DEP) [25][26][27][28][29][30], electrothermal (ET) induced flow [31][32][33][34][35][36][37], and electroconvective instability (EI) [38][39][40] near a permselective membrane are all authoritative methodologies where electric fields are employed to actuate liquid solutions in miniaturization systems.…”

Section: Introductionmentioning

confidence: 99%

A microscopic physical description of electrothermal‐induced flow for control of ion current transport in microfluidics interfacing nanofluidics

et al. 2019

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The phenomenon of electrothermal (ET) convection has recently captured great attention for transporting fluidic samples in microchannels embedding simple electrode structures. In the classical model of ET‐induced flow, a conductivity gradient of buffer medium is supposed to arise from temperature‐dependent electrophoretic mobility of ionic species under uniform salt concentrations, so it may not work well in the presence of evident concentration perturbation within the background electrolyte. To solve this problem, we develop herein a microscopic physical description of ET streaming by fully coupling a set of Poisson‐Nernst‐Planck‐Navier‐Stokes equations and temperature‐dependent fluid physicochemical properties. A comparative study on a standard electrokinetic micropump exploiting asymmetric electrode arrays indicates that, our microscopic model always predicts a lower ET pump flow rate than the classical macroscopic model even with trivial temperature elevation in the liquid. Considering a continuity of total current density in liquids of inhomogeneous polarizability, a moderate degree of fluctuation in ion concentrations on top of the electrode array is enough to exert a significant influence on the induction of free ionic charges, rendering the enhanced numerical treatment much closer to realistic experimental measurement. Then, by placing a pair of thin‐film resistive heaters on the bottom of an anodic channel interfacing a cation‐exchange medium, we further provide a vivid demonstration of the enhanced model's feasibility in accurately resolving the combined Coulomb force due to the coexistence of an extended space charge layer and smeared interfacial polarizations in an externally‐imposed temperature gradient, while this is impossible with conventional linear approximation. This leads to a reliable method to achieve a flexible regulation on spatial‐temporal evolution of ion‐depletion layer by electroconvective mixing. These results provide useful insights into ET‐based flexible control of micro/nanoscale solid entities in modern micro‐total‐analytical systems.

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“…In contrast with linear electroosmotic streaming on insulating charged channel sidewalls, EHD fluid motion appears as a series of flow vortex above an array of ideally polarizable metal-strip electrodes, and the voltage required is commonly no more than dozens of volts [16,17]. In this way, AC nonlinear electrokinetics is able to achieve a higher degree of freedom control on localized flow behavior, and finds interesting applications in pumping, mixing, and separation of target analyte in the context of microfluidics, in virtue of its superior flexibility by adjusting the amplitude, phase gradient, and field frequencies of the voltage wave, namely, AC electrothermal (ACET) [18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38] and AC electroosmosis (ACEO) [39,40,41,42,43,44,45,46,47,48,49,50,51,52,53].…”

Section: Introductionmentioning

confidence: 99%

Multifrequency Induced-Charge Electroosmosis

Song

Liu

et al. 2019

Micromachines

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We present herein a unique concept of multifrequency induced-charge electroosmosis (MICEO) actuated directly on driving electrode arrays, for highly-efficient simultaneous transport and convective mixing of fluidic samples in microscale ducts. MICEO delicately combines transversal AC electroosmotic vortex flow, and axial traveling-wave electroosmotic pump motion under external dual-Fourier-mode AC electric fields. The synthetic flow field associated with MICEO is mathematically analyzed under thin layer limit, and the particle tracing experiment with a special powering technique validates the effectiveness of this physical phenomenon. Meanwhile, the simulation results with a full-scale 3D computation model demonstrate its robust dual-functionality in inducing fully-automated analyte transport and chaotic stirring in a straight fluidic channel embedding double-sided quarter-phase discrete electrode arrays. Our physical demonstration with multifrequency signal control on nonlinear electroosmosis provides invaluable references for innovative designs of multifunctional on-chip analytical platforms in modern microfluidic systems.

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Experimental characterization of induction electrohydrodynamics for integrated microchannel pumping

Cited by 16 publications

References 35 publications

Microfluidic pumping, routing and metering by contactless metal-based electro-osmosis

Microfluidic pumping, routing and metering by contactless metal-based electro-osmosis

A microscopic physical description of electrothermal‐induced flow for control of ion current transport in microfluidics interfacing nanofluidics

Multifrequency Induced-Charge Electroosmosis

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