The Impedance of the Planar Diffuse Double Layer: An Exact Low-Frequency Theory

Gunning, James; Chan, Derek Y. C.; White, Lee R.

doi:10.1006/jcis.1995.1131

Cited by 35 publications

(31 citation statements)

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“…Here we have assumed that the signal frequency is much smaller than the charge relaxation frequency ω ≪ σ/ε in order that the diffuse layer can be considered to be in quasi-equilibrium [51].…”

Section: Mathematical Formulation For Small Voltage and Thin Double Lmentioning

confidence: 99%

AC electrokinetics of conducting microparticles: A review

Ramos

García-Sánchez

Morgan

2016

Current Opinion in Colloid & Interface Science

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This paper reviews both theory and experimental observation of the AC electrokinetic properties of conducting microparticles suspended in an aqueous electrolyte. Applied AC electric fields interact with the induced charge in the electrical double layer at the metal particle-electrolyte interface. In general, particle motion is governed by both the electric field interacting with the induced dipole on the particle and also the induced-charge electro-osmotic (ICEO) flow around the particle. The importance of the RC time for charging the double layer is highlighted. Experimental measurements of the AC electrokinetic behaviour of conducting particles (dielectrophoresis, electro-rotation and electro-orientation) are compared with theory, providing a comprehensive review of the relative importance of particle motion due to forces on the induced dipole compared with motion arising from induced-charge electro-osmotic flow. In addition, the electric-field driven assembly of conducting particles is reviewed in relation to their AC electrokinetic properties and behaviour.

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Section: Mathematical Formulation For Small Voltage and Thin Double Lmentioning

confidence: 99%

AC electrokinetics of conducting microparticles: A review

Ramos

García-Sánchez

Morgan

2016

Current Opinion in Colloid & Interface Science

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“…If the frequency of the applied signal is also low enough, i.e., Ӷ / , the double layer can be assumed to be in quasiequilibrium. 30 Under these conditions the bulk electrolyte behaves in a resistive manner and the double layer considered to be an ideal capacitor. Therefore, the electrical potential in the bulk electrolyte satisfies Laplace's equation…”

Section: The Linear Electrokinetic Problemmentioning

confidence: 99%

Pumping of liquids with traveling-wave electroosmosis

Ramos

Morgan

Green

et al. 2005

Journal of Applied Physics

163

180

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Net flow of electrolyte induced by a traveling-wave electric potential applied to an array of microelectrodes is reported. Two fluid flow regimes have been observed: at small-voltage amplitudes the fluid flow follows the direction of the traveling wave, and at higher-voltage amplitudes the fluid flow is reversed. In both cases, the flow seems to be driven at the level of the electrodes. The experiments have been analyzed with a linear electroosmotic model based upon the Debye-Huckel theory of the double layer. The electrical problem for the experimental interdigitated electrode array is solved numerically using a truncated Fourier series. The observations at low voltages are in qualitative accordance with the electroosmotic model.

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“…With the following definitions, in which ε m is the permittivity of the medium, [6] to first order in V , Poisson's equation and the mass conservation equation are used to generate a system of differential equations, for the N different types of ions in solution:…”

Section: Integral Representation Of the Effective Voltage V Effmentioning

confidence: 99%