Predicting and eliminating Joule heating constraints in large dielectrophoretic IDE separators

Wang, Yan; Du, Fei; Baune, Michael; Thöming, Jorg

doi:10.1016/j.ces.2015.06.042

Cited by 14 publications

(12 citation statements)

References 30 publications

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“…The rise in the medium temperature is a common problem in DEP systems due to the heat generated by the electrical current that passes through the medium (Joule heating) and the Debye relaxation on the surface of the electrodes [15]. The Joule heating problem has been investigated in many DEP systems such as microfilters [16], micro-pumps [17], micromixers [18], Microchips [19], and separators [20].…”

Section: Introductionmentioning

confidence: 99%

“…The second route is by reconfiguring the DEP system and electrode structure [24]. For example, Wang et al used a mathematical model to investigate the influence of the drag force on polyelectrolytic resin particles and predict their trajectories in demineralized water [20]. The investigation was based on reconfiguring the DEP system by controlling the chamber height and using cylindrical interdigitated electrodes (IDE) instead of flat electrodes.…”

Section: Introductionmentioning

confidence: 99%

“…They concluded that the ratio of the DEP velocity to the drag velocity was greater than unity at chamber heights of 4 mm and below. The drag velocity dominated if the channel height increased or the electrode diameter to the electrode spacing ratio exceeded unity [20].…”

Section: Introductionmentioning

confidence: 99%

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Assembly of long carbon nanotube bridges across transparent electrodes using novel thickness‐controlled dielectrophoresis

et al. 2021

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The assembly of carbon nanotubes (CNTs) across planner electrodes using dielectrophoresis (DEP) is one of the standard methods used to fabricate CNT-based devices such as sensors. The medium drag velocity caused by electrokinetic phenomena such as electrothermal and electroosmotic might drive CNTs away from the deposition area. This problem becomes critical at large-scale electrode structures due to the high attenuation of the DEP force. Herein, we simulated and experimentally validated a novel DEP setup that uses a top glass cover to minimize the medium drag velocity. The simulation results showed that the drag velocity can be reduced by 2-3 orders of magnitude compared with the basic DEP setup. The simulation also showed that the optimum channel height to result in a significant drag velocity reduction was between 100 μm and 240 μm. We experimentally report, for the first time, the assembly and alignment of CNT bridges across indium tin oxide (ITO) electrodes with spacing up to 125 μm. We also derived an equation to optimize the CNT's concentration in suspensions based on the electrode gap width and channel height. The deposition of long CNTs across ITO electrodes has potential use in transparent electronics and microfluidic systems.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assembly of long carbon nanotube bridges across transparent electrodes using novel thickness‐controlled dielectrophoresis

et al. 2021

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“…Numerical and experimental analyses of Joule heating in DEP devices have shown the temperature effects on the conductivity of the medium, electrothermal flow, and DEP trapping forces 21–23 . Several DEP studies tried to minimize the Joule heating by using low-conductivity buffer solutions 9,24 , increased or decreased device geometric scale 25–27 , low voltage operation with three-dimensional structure 28 , and coating electrodes with insulation layer 29–31 . In addition, various methods have been applied to measure the heat generation within the DEP device.…”

Section: Introductionmentioning

confidence: 99%

Localized Dielectric Loss Heating in Dielectrophoresis Devices

Kwak

Hossen

Bashir

et al. 2019

Sci Rep

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Temperature increases during dielectrophoresis (DEP) can affect the response of biological entities, and ignoring the effect can result in misleading analysis. The heating mechanism of a DEP device is typically considered to be the result of Joule heating and is overlooked without an appropriate analysis. Our experiment and analysis indicate that the heating mechanism is due to the dielectric loss (Debye relaxation). A temperature increase between interdigitated electrodes (IDEs) has been measured with an integrated micro temperature sensor between IDEs to be as high as 70 °C at 1.5 MHz with a 30 Vpp applied voltage to our ultra-low thermal mass DEP device. Analytical and numerical analysis of the power dissipation due to the dielectric loss are in good agreement with the experiment data.

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“…In addition, EP merely affects the translational movement of insulating charged particles in steady DC fields, which limits the feasibility of samples . Moreover, both ACET and DEP can work in a medium with high conductivity. − DEP has been demonstrated to be an effective technique for repetitive particles/cells trapping, , switching, and sorting, , and ACET occurs concurrently with DEP at high medium conductivities and high frequencies and can exert significant viscous drag forces on particles, thus, affecting their transport patterns inside a nonuniform electric field. − Heeren et al demonstrated that DEP is a short-range interaction; hence, only the particles in the immediate vicinity can be influenced and fixed, while ACET exerts a body force density to the fluid bulk and obeys the no-slip boundary condition, which implies that particles depositing on the planar electrode surface would not be effectively affected by the ACET fluidic drag. In these cases, the combination of DEP and ACET is expected to be able to affect particles suspended throughout almost the entire channel.…”

mentioning

confidence: 99%

Continuous Particle Trapping, Switching, and Sorting Utilizing a Combination of Dielectrophoresis and Alternating Current Electrothermal Flow

et al. 2019

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We propose a simplified multifunctional traffic control approach that effectively combines dielectrophoresis (DEP) and alternating current electrothermal (ACET) flow to realize continuous particle trapping, switching, and sorting. In the designed microsystem, the combined DEP and ACET effects, which are symmetrically generated above a bipolar electrode surface, contribute to focus the incoming colloidal particles into a thin beam. Once the bipolar electrode is energized with an electric gate signal completely in phase with the driving alternating current (AC) signal, the spatial symmetry of the electric field can be artificially reordered by adjusting the gate voltage through fieldeffect traffic control. This results in a reshapable field stagnant region for precise switching of particles into the region of interest. Moreover, the integrated particle switching prior to the scaled particle trapping experiment is successfully conducted to demonstrate the feasibility of the combined strategy. Furthermore, a mixture of two types of particle sorting (i.e., density, size) with quick response performance is achieved by increasing the driving voltage with a maximum gate voltage offset, thus, extending the versatility of the designed device. Finally, droplet switching and filtration of the satellite droplets from the parent droplets is performed to successfully permit control of the droplet traffic. The proposed traffic control approach provides a promising technique for flexible manipulation of particulate samples and can be conveniently integrated with other micro/nanofluidic components into a complete functional on-chip platform owing to its simple geometric structure, easy operation, and multifunctionality.

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Predicting and eliminating Joule heating constraints in large dielectrophoretic IDE separators

Cited by 14 publications

References 30 publications

Assembly of long carbon nanotube bridges across transparent electrodes using novel thickness‐controlled dielectrophoresis

Assembly of long carbon nanotube bridges across transparent electrodes using novel thickness‐controlled dielectrophoresis

Localized Dielectric Loss Heating in Dielectrophoresis Devices

Continuous Particle Trapping, Switching, and Sorting Utilizing a Combination of Dielectrophoresis and Alternating Current Electrothermal Flow

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