Hydrodynamic modulation using vibrating electrodes: Application to electroanalysis

Williams, David E.; Ellis, Keith; Colville, Alistair; Dennison, Stephen J.; Laguillo, George; Larsen, Jane P.

doi:10.1016/s0022-0728(97)00214-3

Cited by 34 publications

(36 citation statements)

References 30 publications

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“…Other examples of these systems involve, pulsed rotation [12][13][14][15], vibrating electrode techniques [16,17], ultrasonic cavitation [18,19] or, more recently, vibrating or chopped capillary flow systems based around a novel scanning electrochemical microscopy (SECM) technique [20][21][22]. In all of these cases the detection limits proposed have been impressive, generally below 0.5 µmol dm -3 .…”

Section: Introductionmentioning

confidence: 99%

An HMV mapping study of a pulsating jet system

Kuleshova

Birkin

Elliott

2008

Journal of Electroanalytical Chemistry

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A new system for the generation of hydrodynamic modulated voltammetry (HMV) is presented. This system consists of an oscillating jet produced through the mechanical vibration of a large diaphragm. The structure of the cell is such that a relatively small vibration is transferred to a large fluid flow at the jet outlet. ) it can also be used to create a HMV system where a 'lock -in' approach is adopted to investigate the redox chemistry in question. This is demonstrated for the Fe(CN) 6 3-/4-redox system. Here 'lock -in' to the modulated hydrodynamic signal is achieved through the deployment of bespoke software. The apparatus and procedure is shown to produce a simple and efficient way to obtain the desired signal. In addition the spatial variation of the HMV signal, phase correction and time averaged current with respect to the jet orifice is presented.

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Section: Introductionmentioning

confidence: 99%

An HMV mapping study of a pulsating jet system

Kuleshova

Birkin

Elliott

2008

Journal of Electroanalytical Chemistry

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“…Microband electrodes can readily be constructed by sealing thin films of gold or platinum in an insulating material [1], by screen printing [2] or by lithographic techniques [3]. The critical dimension of a microband is the width w. Depending on the fabrication technique, a range from 25 mm down to about 0.1 mm can be obtained.…”

Section: Introductionmentioning

confidence: 99%

Computational Study of Chronoamperometry at Rectangular Microelectrodes

Strutwolf

2005

Electroanalysis

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Three (space) dimensional diffusion to a rectangular microelectrode of length l and width w, embedded in an infinite coplanar insulator is simulated with boundary conditions for a chronoamperometric experiment. An alternating direction implicit finite difference method (Douglas-Gunn algorithm) utilizing a problem adapted grid is used to solve the diffusion equation. Current transients are computed for different values of the dimensionless length parameter L ¼ l/w, starting with L ¼ 1, i.e., a square electrode. Edge effects at the four sides of the rectangular electrode as well as the vertex effect contribute to the total current. With increasing L the transients approach the behavior of a microband electrode transient, where diffusion is essentially two dimensional. The breakdown of the two dimensional diffusion approach with decreasing values of L is analyzed and quantified. This serves as a guideline for analyzing transients measured with electrodes where the condition l » w is not fulfilled.

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“…These results emphasizes the advantages of L 0 -stable extrapolation method are revealed for systems where short-time behavior is important. In a recent publication Williams et al [40] reported about hydrodynamic modulation using vibrating Fig. 6.…”

Section: Resultsmentioning

confidence: 99%

“…One way of thinking about these systems is to consider a model in which the boundary layer is periodically renewed by an instantaneously rapid motion of the electrode. This would be a crude approximation for sinusoidal motion but would apply better in the case of repetitive pulsed motion [40] especially if the motion between the stationary points is very fast. Experimentaly this could be achieved by driving the electrode with a piezoelectric motor.…”

Section: Resultsmentioning

confidence: 99%

Digital Simulation of Two-Dimensional Mass Transfer Problems in Electrochemistry Using the Extrapolation Method

Strutwolf

Williams

1999

Electroanalysis

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In this article we report the application of the extrapolation method to electrochemical problems involving two-dimensional mass transfer. The extrapolation method is based on a combination of fully implicit difference schemes and was previously successfully used in solving electrochemical processes including linear diffusion. The diffusion equation to a microband electrode under diffusion controlled conditions is solved by the extrapolation method and the alternating implicit direction technique. The results are compared. Both ®nite difference methods have the same order of accuracy but the extrapolation technique has a higher order of stability making it preferable for stiff relaxation problems and for an accurate simulation of short time behavior.

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Hydrodynamic modulation using vibrating electrodes: Application to electroanalysis

Cited by 34 publications

References 30 publications

An HMV mapping study of a pulsating jet system

An HMV mapping study of a pulsating jet system

Computational Study of Chronoamperometry at Rectangular Microelectrodes

Digital Simulation of Two-Dimensional Mass Transfer Problems in Electrochemistry Using the Extrapolation Method

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