Simulation and experimental validation of the interplay between dielectrophoretic and electroosmotic behavior of conductive and insulator particles for nanofabrication and lab-on-chip applications

Abdulhameed, Abdullah; Halim, Mohd Mahadi; Halin, Izhal Abdul

doi:10.1016/j.colsurfa.2023.131065

Cited by 6 publications

(4 citation statements)

References 48 publications

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“…The EDL thickness increases as the medium conductivity increase causing a drop in the applied potential. In a recent study, the interplay between DEP and ACEO was demonstrated theoretically and experimentally, where MWCNTs were manipulated at different frequencies [233]. The authors found that the velocity due to the ACEO dominated the CNT motion and dragged them to the electrode surface at frequencies lower than 1 kHz.…”

Section: Electroosmosis and Double Layer Effectmentioning

confidence: 99%

Dielectrophoretic alignment of carbon nanotubes: theory, applications, and future

2023

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Carbon nanotubes (CNTs) are nominated to be the successor of several semiconductors and metals due to their unique physical and chemical properties. It has been concerning that the anisotropic and low controllability of CNTs impedes their adoption in commercial applications. Dielectrophoresis (DEP) is known as the electrokinetics motion of polarizable nanoparticles under the influence of non-uniform electric fields. The uniqueness of this phenomenon allows DEP to be employed as a novel method to align, assemble, separate, and manipulate CNTs suspended in liquid mediums. This article begins with a brief overview of CNT structure and production, with the emphasize on their electrical properties and response to electric fields. The DEP phenomenon as a CNT alignment method is demonstrated and graphically discussed, along with its theory, procedure, and parameters. We also discussed the side forces that arise in DEP systems and how they negatively or positively affect the CNT alignment. The article concludes with a brief review of CNT-based devices fabricated using DEP, as well as the method’s limitations and future prospects. 

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Section: Electroosmosis and Double Layer Effectmentioning

confidence: 99%

Dielectrophoretic alignment of carbon nanotubes: theory, applications, and future

2023

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“…Further details can be found elsewhere [45]; (C) boundary conditions of the particle tracing for fluid flow module, where v and v c are the velocity and particle velocity when hitting the wall. Further details can be found elsewhere [46].…”

Section: Mrsa Mssa Referencementioning

confidence: 99%

Dielectrophoresis microbial characterization and isolation of Staphylococcus aureus based on optimum crossover frequency

Rozaini,

Abdulhameed,

Deivasigamani

et al. 2023

Electrophoresis

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Characterization of antibiotic‐resistant bacteria is a significant concern that persists for the rapid classification and analysis of the bacteria. A technology that utilizes the manipulation of antibiotic‐resistant bacteria is key to solving the significant threat of these pathogenic bacteria by rapid characterization profile. Dielectrophoresis (DEP) can differentiate between antibiotic‐resistant and susceptible bacteria based on their physical structure and polarization properties. In this work, the DEP response of two Gram‐positive bacteria, namely, Methicillin‐resistant Staphylococcus aureus (MRSA) and Methicillin‐susceptible S. aureus (MSSA), was investigated and simulated. The DEP characterization was experimentally observed on the bacteria influenced by oxacillin and vancomycin antibiotics. MSSA control without antibiotics has crossover frequencies () from 6 to 8 MHz, whereas MRSA control is from 2 to 3 MHz. The changed when bacteria were exposed to the antibiotic. As for MSSA, the decreased to 3.35 MHz compared to MSSA control without antibiotics, MRSA, increased to 7 MHz when compared to MRSA control. The changes in the DEP response of MSSA and MRSA with and without antibiotics were theoretically proven using MyDEP and COMSOL simulation and experimentally based on the modification to the bacteria cell walls. Thus, the DEP response can be employed as a label‐free detectable method to sense and differentiate between resistant and susceptible strains with different antibiotic profiles. The developed method can be implemented on a single platform to analyze and identify bacteria for rapid, scalable, and accurate characterization.

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“…Field-reconfigurable optical materials with two or more distinct particle types having different optical responses could enable more elaborate tunable optics than are possible for single particle types, particularly if the different particle types can be independently addressed to mix/demix or assemble them to different locations or organizations. Dielectrophoresis (DEP)-directed assembly of binary particle mixtures where both particle types have the same composition but differ in size, surface groups, surface charge densities, or concentration ratios has been studied to understand how particles interact and assemble together. − DEP has also been used in conjunction with topographical features, often for bioseparations, such as the separation and isolation of cells or biomaterials depending upon their properties (i.e., live or dead). − Nonbiological particles have also been separated via DEP. − To date, there has been significantly less focus on the DEP co-assembly of binary particle mixtures of differing materials ,, and relatively little consideration for the optical implications and functionality of the generated systems. For example, Demirörs and Alison co-assembled polystyrene and silica particles of differing size in the vicinity of photoresist posts, taking advantage of field-induced dipolar interactions between the particles to produce colloidal superstructures, including Saturn ring-like and candle flame-like structures .…”

Section: Introductionmentioning

confidence: 99%

“…We then combine the particles into various binary mixtures, with the possibility of creating a variety of optical responses in one system. Numerous studies demonstrate the utility of employing in silico tools to bolster the controllability of DEP-based dielectric particle assemblies. ,,− Likewise, we leverage a finite element method-based electrical simulation, coupled with Monte Carlo (MC) simulations, to decipher the underlying factors contributing to the experimental assembly observations. Our work brings to light an electromodulative shielding effect that can affect multiparticle assemblies.…”

Section: Introductionmentioning

confidence: 99%

Effect of Particle Composition on Dielectrophoretic Co-Assemblies around Topographic Features: Experiment and Theory

Hendrickson-Stives,

Jahanmahin,

Fichthorn

et al. 2024

J. Phys. Chem. C

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Dielectrophoresis is a powerful method for colloidal particle assembly that is particularly suited to forming structures that can be reconfigured via changes in field conditions. Realization of functional assemblies for optical applications requires consideration of particle material properties that determine both the optical response and particles' dielectrophoretic behavior. Few studies have directly compared dielectrophoretic assembly of different materials or investigated assemblies having binary mixtures of different particle compositions. Here, we investigate the assembly of individual and binary assembly mixtures of ∼1 μm microspheres around microfabricated photoresist posts using both experiment and simulation. The particles include a semiconductor (TiO 2 ) and two insulating materials, one inorganic (SiO 2 ) and one organic [poly(methyl methacrylate) (PMMA)]. Individually, SiO 2 and PMMA assembled atop photoresist posts as the frequency and voltage were increased, displaying negative dielectrophoresis. TiO 2 particles assembled around the sides of the posts at low frequencies and atop the posts only at higher frequencies and voltages. These behaviors for all particle types were observed in both simulation and experiment. Mixtures of TiO 2 particles with either SiO 2 or PMMA, however, did not show a straightforward combination of their individual assembly properties, and their assembly depended upon the relative concentrations of the two particle types. This phenomenon brings to light an electromodulative shielding effect that can affect multiparticle assemblies. By adjusting conditions, it was possible to reconfigure assemblies of semiconducting and insulating particles to sort them to different sites or combine them together. These experiments and simulations provide insights into the assembly of particles with varying material properties, helping set the stage for the development of functional binary systems able to provide field-responsive spatial variations in refractive index and/or tunable scattering.

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Simulation and experimental validation of the interplay between dielectrophoretic and electroosmotic behavior of conductive and insulator particles for nanofabrication and lab-on-chip applications

Cited by 6 publications

References 48 publications

Dielectrophoretic alignment of carbon nanotubes: theory, applications, and future

Dielectrophoretic alignment of carbon nanotubes: theory, applications, and future

Dielectrophoresis microbial characterization and isolation of Staphylococcus aureus based on optimum crossover frequency

Effect of Particle Composition on Dielectrophoretic Co-Assemblies around Topographic Features: Experiment and Theory

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