The role of medium on the assembly of carbon nanotube by dielectrophoresis

Abdulhameed, Abdullah; Halin, Izhal Abdul; Mohtar, Mohd Nazim; Hamidon, Mohd Nizar

doi:10.1080/01932691.2019.1631841

Cited by 17 publications

(11 citation statements)

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“…Several million devices were packaged in a square centimeter [61]. Recent studies concluded that the quality of aligned CNTs using DEP depends on many factors, such as the electrode design [62,63], suspension quality [64], and CNTs enrichment [65,66].…”

Section: Alignment By Electric Forcesmentioning

confidence: 99%

Carbon Nanotube Alignment Methods

Abdulhameed¹

2023

Carbon Nanotubes - Recent Advances, New Perspectives and Potential Applications

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The outstanding properties of carbon nanotubes (CNTs) exist in their nanoscale form. The CNTs must be maintained aligned in the device to preserve these properties in the macroscale and bulk form. Recently, many studies addressed the alignment of CNTs at different scales for different applications. For example, CNTs are aligned vertically simultaneously as they grow on a substrate. Pre-synthesized CNTs can be aligned horizontally on a large scale under the influence of external forces such as electric and magnetic forces. This chapter reviews the latest techniques and methods regarding the horizontal alignment of CNTs. The alignment methods are classified based on the force used to achieve the alignment. The chapter concludes by discussing each method\'s advantages, disadvantages, and potential applications.

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Section: Alignment By Electric Forcesmentioning

confidence: 99%

Carbon Nanotube Alignment Methods

Abdulhameed¹

2023

Carbon Nanotubes - Recent Advances, New Perspectives and Potential Applications

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“…In DEP systems, applying an electric field inside the fluid creates significant forces other than the DEP force, which in turn generates fluid motion and alter the DEP manipulation of micro-and nanoparticles [52,53]. These forces, such as electrothermal force (ETF), EOF, and Brownian motion, are directly or indirectly affected by the conductivity of the media [54]. Thus, selecting the conductive medium is critical to ensure that the F DEP magnitude is larger enough to dominate these forces and prevent any unexpected particle motion or damage.…”

Section: Dep Mechanismmentioning

confidence: 99%

A correlation of conductivity medium and bioparticle viability on dielectrophoresis‐based biomedical applications

et al. 2023

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Dielectrophoresis (DEP) bioparticle research has progressed from micro to nano levels. It has proven to be a promising and powerful cell manipulation method with an accurate, quick, inexpensive, and label-free technique for therapeutic purposes. DEP, an electrokinetic phenomenon, induces particle movement as a result of polarization effects in a nonuniform electrical field. This review focuses on current research in the biomedical field that demonstrates a practical approach to DEP in terms of cell separation, trapping, discrimination, and enrichment under the influence of the conductive medium in correlation with bioparticle viability. The current review aims to provide readers with an in-depth knowledge of the fundamental theory and principles of the DEP technique, which is influenced by conductive medium and to identify and demonstrate the biomedical application areas. The high conductivity of physiological fluids presents obstacles and opportunities, followed by bioparticle viability in an electric field elaborated in detail. Finally, the drawbacks of DEP-based systems

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“…There are two routes to solve the joule heating problem or reduce its effects, such as the medium drag velocity. The first route is by optimizing the components of the DEP system, such as optimization of the medium electrical conductivity and the AC signal parameters [21,22]. However, this solution might not be enough because DEP suffers from high attenuation rates, where the velocity due to DEP force dramatically decreases as the distance from the electrode outer surface increases [23].…”

Section: Introductionmentioning

confidence: 99%

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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The role of medium on the assembly of carbon nanotube by dielectrophoresis

Cited by 17 publications

References 50 publications

Carbon Nanotube Alignment Methods

Carbon Nanotube Alignment Methods

A correlation of conductivity medium and bioparticle viability on dielectrophoresis‐based biomedical applications

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

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