Microfluidic pumping optimization in microgrooved channels with ac electrothermal actuations

Du, E.; Manoochehri, Souran

doi:10.1063/1.3280076

Cited by 38 publications

(43 citation statements)

References 22 publications

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“…5(a) and 5(b) show that there is no detectable velocity profile for fluidic channel depths Շ10 lm, which is in agreement with the parametric study carried out by Ref. 21. It seems that for this range of fluidic depths the flow would be observed if the order of magnitude of the size of electrodes was reduced correspondingly.…”

Section: A Effect Of Fluidic Channel Depthsupporting

confidence: 89%

“…Also, a parametric study performed by Ref. 21 showed that for asymmetric planar electrode configuration, increasing the depth to more than 500 lm, does not have a perceptible effect on mean velocity. In this section, MAET with two arrays of microelectrodes placed at the top and bottom of the microfluidic channel is compared to a conventional ACET micropump with a single microelectrode array at the bottom.…”

Section: A Thermal Aspectmentioning

confidence: 98%

“…Such structures include interdigitated electrode pairs with unequal widths, 22 T-shaped electrode arrays, 7 concentric electrode design, 23 and 3D electrode structures. 19,21,22 Using two opposing microelectrodes in a microchannel aimed for mixing and particle assembly have also been studied, 14,24 as has applying a travelling wave on a group of symmetric microelectrodes. 25 In this paper, a novel AC-actuated multiple array electrothermal (MAET) micropump based on asymmetric coplanar microelectrode geometries is proposed, designed, numerically characterized, and experimentally investigated.…”

mentioning

confidence: 99%

“…However, for pumping applications, it is essential to create asymmetry in the electric field to cause asymmetric vortices that generate a new fluid flow in one direction. 20 As commonly used by many groups, 4,6,7,21 imposing geometry asymmetry to microelectrodes results in non-uniform electric fields. Such structures include interdigitated electrode pairs with unequal widths, 22 T-shaped electrode arrays, 7 concentric electrode design, 23 and 3D electrode structures.…”

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confidence: 99%

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A novel alternating current multiple array electrothermal micropump for lab-on-a-chip applications

2015

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The AC electrothermal technique is very promising for biofluid micropumping, due to its ability to pump high conductivity fluids. However, compared to electroosmotic micropumps, a lack of high fluid flow is a disadvantage. In this paper, a novel AC multiple array electrothermal (MAET) micropump, utilizing multiple microelectrode arrays placed on the side-walls of the fluidic channel of the micropump, is introduced. Asymmetric coplanar microelectrodes are placed on all sides of the microfluidic channel, and are actuated in different phases: one, two opposing, two adjacent, three, or all sides at the same time. Micropumps with different combinations of side electrodes and cross sections are numerically investigated in this paper. The effect of the governing parameters with respect to thermal, fluidic, and electrical properties are studied and discussed. To verify the simulations, the AC MAET concept was then fabricated and experimentally tested. The resulted fluid flow achieved by the experiments showed good agreement with the corresponding simulations. The number of side electrode arrays and the actuation patterns were also found to greatly influence the micropump performance. This study shows that the new multiple array electrothermal micropump design can be used in a wide range of applications such as drug delivery and lab-on-a-chip, where high flow rate and high precision micropumping devices for high conductivity fluids are needed.

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Section: A Effect Of Fluidic Channel Depthsupporting

confidence: 89%

Section: A Thermal Aspectmentioning

confidence: 98%

mentioning

confidence: 99%

mentioning

confidence: 99%

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A novel alternating current multiple array electrothermal micropump for lab-on-a-chip applications

2015

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“…The microgrooved structure increased the pumping capacity by five to six-fold as compared to a simple asymmetric electrode arrangement with the same effective dimensions. 30, 31 …”

Section: Microfluidic Operationsmentioning

confidence: 99%

AC Electrokinetics of Physiological Fluids for Biomedical Applications

Liu

Lamanda

et al. 2015

SLAS Technology

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AC electrokinetics is a collection of processes for manipulating bulk fluid mass and embedded objects with AC electric fields. The ability of AC electrokinetics to implement the major microfluidic operations, such as pumping, mixing, concentration and separation, makes it possible to develop integrated systems for clinical diagnostics in non-traditional healthcare settings. The high conductivity of physiological fluids presents new challenges and opportunities for AC electrokinetics based diagnostic systems. In this review, AC electrokinetic phenomena in conductive physiological fluids are described followed by a review of the basic microfluidic operations and the recent biomedical applications of AC electrokinetics. The future prospects of AC electrokinetics for clinical diagnostics are presented.

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Rapid mixing with high‐throughput in a semi‐active semi‐passive micromixer

Kunti

Bhattacharya

2017

Electrophoresis

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In this paper, we investigate a novel alternating current electrothermal (ACET) micromixer driven by a high efficiency ACET micropump. The micromixer consists of thin film asymmetric pairs of electrodes on the microgrooved channel floor and array of electrode pairs fabricated on the top wall. By connecting electrodes with AC voltage, ACET forces are induced. Asymmetric microgrooved electrodes force the fluids along the channel, while lateral vortex pairs are generated by symmetric electrode pairs located on the top wall. Waviness of the floor increases contact area between two confluent streams within a narrow confinement. An active mixer operates as a semi active semi passive mixer. Effects of various parameters are investigated in details in order to arrive at an optimal configuration that provides for efficient mixing as well as appreciable transport. It is found that using a specific design, uniform and homogeneous mixing quality with mixing efficiency of 97.25% and flow rate of 1.794μm2/ min per unit width of the channel can be achieved.

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Microfluidic pumping optimization in microgrooved channels with ac electrothermal actuations

Cited by 38 publications

References 22 publications

A novel alternating current multiple array electrothermal micropump for lab-on-a-chip applications

A novel alternating current multiple array electrothermal micropump for lab-on-a-chip applications

AC Electrokinetics of Physiological Fluids for Biomedical Applications

Rapid mixing with high‐throughput in a semi‐active semi‐passive micromixer

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