Calculation of the electric polarizability of a charged spherical dielectric particle by the theory of colloidal electrokinetics

Zhou, Hao; Preston, Matthew A.; Tilton, Robert D.; White, Lee R.

doi:10.1016/j.jcis.2004.11.065

Cited by 56 publications

(61 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Counterions are more mobile in the diffuse layer than in the Stern layer, and contribute separately to the overall magnitude of K s and thus to the DEP behavior of nanoparticles. [28][29][30][31] A comprehensive study of the ac and dc electrokinetic properties of latex nanoparticles, as a function of suspending medium conductivity and viscosity, has been reported by Ermolina and Morgan, 32 and a theoretical modeling of the DEP force that takes into account the influence of the electrical double layer has been presented by Zhou et al 33 Analysis of the normal and tangential ionic currents that occur around and at the surface of a particle, when its diameter approaches and becomes smaller than the width of its own electrical double layer, indicates that a capacitance effect contributes to the total polarizability of the particle, and exceeds the influence of the surface conductance K s . 34,35 Basuray and Chang 34 also showed that the DEP cross-over frequency for nanocolloids is inversely proportional to the RC time constant of the diffuse layer component of the electrical double layer.…”

Section: ͑15͒mentioning

confidence: 99%

Review Article—Dielectrophoresis: Status of the theory, technology, and applications

2010

View full text Add to dashboard Cite

A review is presented of the present status of the theory, the developed technology and the current applications of dielectrophoresis ͑DEP͒. Over the past 10 years around 2000 publications have addressed these three aspects, and current trends suggest that the theory and technology have matured sufficiently for most effort to now be directed towards applying DEP to unmet needs in such areas as biosensors, cell therapeutics, drug discovery, medical diagnostics, microfluidics, nanoassembly, and particle filtration. The dipole approximation to describe the DEP force acting on a particle subjected to a nonuniform electric field has evolved to include multipole contributions, the perturbing effects arising from interactions with other cells and boundary surfaces, and the influence of electrical double-layer polarizations that must be considered for nanoparticles. Theoretical modelling of the electric field gradients generated by different electrode designs has also reached an advanced state. Advances in the technology include the development of sophisticated electrode designs, along with the introduction of new materials ͑e.g., silicone polymers, dry film resist͒ and methods for fabricating the electrodes and microfluidics of DEP devices ͑photo and electron beam lithography, laser ablation, thin film techniques, CMOS technology͒. Around three-quarters of the 300 or so scientific publications now being published each year on DEP are directed towards practical applications, and this is matched with an increasing number of patent applications. A summary of the US patents granted since January 2005 is given, along with an outline of the small number of perceived industrial applications ͑e.g., mineral separation, micropolishing, manipulation and dispensing of fluid droplets, manipulation and assembly of micro components͒. The technology has also advanced sufficiently for DEP to be used as a tool to manipulate nanoparticles ͑e.g., carbon nanotubes, nano wires, gold and metal oxide nanoparticles͒ for the fabrication of devices and sensors. Most efforts are now being directed towards biomedical applications, such as the spatial manipulation and selective separation/enrichment of target cells or bacteria, high-throughput molecular screening, biosensors, immunoassays, and the artificial engineering of three-dimensional cell constructs. DEP is able to manipulate and sort cells without the need for biochemical labels or other bioengineered tags, and without contact to any surfaces. This opens up potentially important applications of DEP as a tool to address an unmet need in stem cell research and therapy.

show abstract

Section: ͑15͒mentioning

confidence: 99%

Review Article—Dielectrophoresis: Status of the theory, technology, and applications

2010

View full text Add to dashboard Cite

show abstract

“…To capture target cells without losing, we calculated the maximum flow rate that we will use in experiments. To estimate the flow rate, first, we calculated the DEP force on a 20µm diameter cell (or bead) in the z direction along the contour A-B (" Figure. 2 ) , and calculated the DEP force using equation (1) and plotted in " Figure. 3(c)" [18][19][20]. For more stringent conditions, we have calculated the critical dimensions of the device needed to capture the cells that are about 400 µm above the electrodes.…”

Section: Design and Fabrication Of Microfluidics Channelsmentioning

confidence: 99%

Design and Fabrication of a Dielectrophoretic Cell Trap Array

Velmanickam¹,

Nawarathna²

2017

Adv. sci. technol. eng. syst. j.

View full text Add to dashboard Cite

show abstract

“…This accelerates the ion transport mechanisms and results in the electrolysis process at the solid/solution interface where O 2 is produced at the anode and H 2 is produced at the cathode. These processes occur at a potential limit that depends on the electrode materials [5][6][7][8][9][10][11] …”

Section: A Electrical Properties Ofwatermentioning

confidence: 99%

“…At higher frequencies, a reversible faradic process may occurs via charge transfer at the interface (oxide formation and reduction) in addition adsorption and desorption of water ions. Since the polarity alteration of the electrodes must cycle rapidly at some resonant frequency, a reversible electrode process is necessary whereas, in the case of an irreversible process, the alternating potential would result in the accumulation of solids or gasses onto the electrode surface overtime [5][6][7][8][9][10][11].…”

Section: B Feeding Processmentioning

confidence: 99%

A novel liquid antenna for wearable bio-monitoring applications

Traille

Yang

Rida

et al. 2008

2008 IEEE MTT-S International Microwave Symposium Digest

View full text Add to dashboard Cite

-The performance of the most commonly used metal antennas close to the human body is one of the limiting factors of the performance of bio-sensors and wireless body area networks (WBAN). Due to the high dielectric and conductivity contrast with respect to most parts of the human body (blood, skin, ...), the range of most of the wireless sensors operating in RF and microwave frequencies is limited to 1-2 cm when attached to the body. In this paper, we introduce the very novel idea of liquid antennas, that is based on engineering the properties of liquids. This approach allows for the improvement of the range by a factor of 5-10 in a very easy-to-realize way, just modifying the salinity of the aqueous solution of the antenna. A similar methodology can be extended to the development of liquid RF electronics for implantable devices and wearable realtime bio-signal monitoring, since it can potentially lead to very flexible antenna and electronic configurations.

show abstract

Calculation of the electric polarizability of a charged spherical dielectric particle by the theory of colloidal electrokinetics

Cited by 56 publications

References 11 publications

Review Article—Dielectrophoresis: Status of the theory, technology, and applications

Review Article—Dielectrophoresis: Status of the theory, technology, and applications

Design and Fabrication of a Dielectrophoretic Cell Trap Array

A novel liquid antenna for wearable bio-monitoring applications

Contact Info

Product

Resources

About