Electrothermal flow in dielectrophoresis of single-walled carbon nanotubes

Lin, Yuan; Shiomi, Junichiro; Maruyama, Shigeo; Amberg, Gustav

doi:10.1103/physrevb.76.045419

Cited by 10 publications

(13 citation statements)

References 16 publications

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“…Micropumps based on electrothermal flow have also been proposed by using an array of asymmetric pairs of electrodes25, 26. On the other hand, a combination of electrothermal flow and other electrokinetic effects have been demonstrated for particle trapping, concentration, separation, mixing, and pumping27-30. In addition to Joule heating induced electrothermal flow, opto-electrical fluid motion has been reported for particle manipulation31-33.…”

Section: Introductionmentioning

confidence: 99%

Electrothermal Fluid Manipulation of High-Conductivity Samples for Laboratory Automation Applications

Sin

Gau

Liao

et al. 2010

JALA: Journal of the Association for Laboratory Automation

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E lectrothermal flow is a promising technique in microfluidic manipulation toward laboratory automation applications, such as clinical diagnostics and high-throughput drug screening. Despite the potential of electrothermal flow in biomedical applications, relatively little is known about electrothermal manipulation of highly conductive samples, such as physiological fluids and buffer solutions. In this study, the characteristics and challenges of electrothermal manipulation of fluid samples with different conductivities were investigated systematically. Electrothermal flow was shown to create fluid motion for samples with a wide range of conductivity when the driving frequency was greater than 100 kHz. For samples with low conductivities (below 1 S/m), the characteristics of the electrothermal fluid motions were in quantitative agreement with the theory. For samples with high conductivities (greater than 1 S/m), the fluid motion appeared to deviate from the model as a result of potential electrochemical reactions and other electrothermal effects. These effects should be taken into consideration for electrothermal manipulation of biological samples with high conductivities. This study will provide insights in designing microfluidic devices for electrokinetic manipulation of biological samples toward laboratory automation applications in the future. ( JALA 2010;15:426-32) INTRODUCTIONThe development of automated microfluidic systems poses great promises for a variety of medical diagnostic applications. 1e3 Although extensive research efforts have been devoted to integrate various transduction mechanisms, including optical, inertial, interfacial, and electrochemical sensing, the transducers often require sample preparation components for handling clinical samples. 4e7 The implementation of the sample preparation modules, which critically determines the overall performance of the system, can often be cumbersome, labor intensive, and time consuming, and represents a major challenge for laboratory automation. 8,9 Among numerous microfluidic techniques, alternating current (AC) electrokinetics is one of the most promising approaches for addressing this fundamental hurdle in laboratory automation. 10e12 AC electrokinetics is especially effective in the micro and nano domains and can be easily integrated with other microfluidic components. Furthermore, combinations of different electrokinetic phenomena allow fundamental fluidic operations, including concentration, separation, mixing, and pumping, to be performed in the same platform. 13e15 Electrokinetics has also been applied in various mechanobiological applications. 16,17 All these features render electrokinetics one of the most promising approaches for developing fully integrated microfluidic diagnostic systems for laboratory automation. 18,19 Most electrokinetic techniques, such as dielectrophoresis and AC electroosmosis, are effective only in low-conductivity fluids. Electrothermal flow, on the other hand, is effective in fluids that have a wide range of cond...

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Section: Introductionmentioning

confidence: 99%

Electrothermal Fluid Manipulation of High-Conductivity Samples for Laboratory Automation Applications

Sin

Gau

Liao

et al. 2010

JALA: Journal of the Association for Laboratory Automation

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“…Therefore, our calculation suggests that by using the effective dipole moment method, the magnitude of the DEP force on SWNTs is very likely to be severely overestimated especially when they approach the electrodes such that their length becomes comparable to the length scale of the electric field. We have previously calculated DEP forces of SWNT by using the effective dipole moment method and compared its magnitude with the electrothermal force of the fluid, and concluded that the flow motions can dominate the motion of SWNTs in a sizable domain when applied voltage is high and when the concentration of solution is large [16]. The present work indicates that the domain where electrothermal flow is dominating can be even larger than we estimated since the effective dipole moment method overestimates the DEP force as SWNTs approaches to electrodes.…”

Section: Dep Force In a General External Electric Fieldmentioning

confidence: 98%

“…The reason is that either FEM or IBEM is used, the meshes based on which the numerical integrations are performed would inevitably possess large skewness; therefore, considerable numerical errors can occur. Another method is the point effective dipole method [3], which is used extensively for calculation of spherical and ellipsoidal-shaped cells and rod-shaped SWNTs [5,8,[11][12]16]. It is favored due to its simplicity, and becomes a practical approach.…”

mentioning

confidence: 99%

Numerical calculation of the dielectrophoretic force on a slender body

2009

Self Cite

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In this paper, a model is proposed to numerically calculate the dielectrophoretic (DEP) force acting on a straight slender body in a non-uniform electric field. The induced charges are assumed to be located along the centerline of the slender body. By enforcing the boundary conditions at the interfaces of the two dielectrics, an integral equations system is obtained with the induced charge densities as unknowns. Based on the calculated induced charge densities, expressions to calculate the DEP force and torque are obtained. The calculated induced charge density of a prolate ellipsoid under a uniform electric field is compared with the analytic solution and an excellent agreement is achieved. The smaller the slenderness (the ratio of maximum radius to length of the slender body), the smaller the error is. The DEP force that a prolate ellipsoid experiences in a general electric field is numerically calculated and compared with the results obtained by the commonly accepted effective dipole moment method. The current model is expected to possess higher accuracy than the effective dipole moment method and to demand less calculation work than the Maxwell stress tensor method.

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“…built on this by demonstrating with simulation and experiment that CNTs are preferentially attracted to already deposited not fully bridging CNTs forming chains, due to the enhanced electric field at CNT tips. [ 160b ] Oliva‐Avilés et al. reported additional experiments and simulations investigating the process of CNT chaining in dispersion during DEP.…”

Section: Patterning From Cnt Dispersionsmentioning

confidence: 99%

Nanoscale Patterning of Carbon Nanotubes: Techniques, Applications, and Future

Corletto

Shapter

2020

Advanced Science

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Carbon nanotube (CNT) devices and electronics are achieving maturity and directly competing or surpassing devices that use conventional materials. CNTs have demonstrated ballistic conduction, minimal scaling effects, high current capacity, low power requirements, and excellent optical/photonic properties; making them the ideal candidate for a new material to replace conventional materials in next-generation electronic and photonic systems. CNTs also demonstrate high stability and flexibility, allowing them to be used in flexible, printable, and/or biocompatible electronics. However, a major challenge to fully commercialize these devices is the scalable placement of CNTs into desired micro/nanopatterns and architectures to translate the superior properties of CNTs into macroscale devices. Precise and high throughput patterning becomes increasingly difficult at nanoscale resolution, but it is essential to fully realize the benefits of CNTs. The relatively long, high aspect ratio structures of CNTs must be preserved to maintain their functionalities, consequently making them more difficult to pattern than conventional materials like metals and polymers. This review comprehensively explores the recent development of innovative CNT patterning techniques with nanoscale lateral resolution. Each technique is critically analyzed and applications for the nanoscale-resolution approaches are demonstrated. Promising techniques and the challenges ahead for future devices and applications are discussed.

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Electrothermal flow in dielectrophoresis of single-walled carbon nanotubes

Cited by 10 publications

References 16 publications

Electrothermal Fluid Manipulation of High-Conductivity Samples for Laboratory Automation Applications

Electrothermal Fluid Manipulation of High-Conductivity Samples for Laboratory Automation Applications

Numerical calculation of the dielectrophoretic force on a slender body

Nanoscale Patterning of Carbon Nanotubes: Techniques, Applications, and Future

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