Flow-rate independent component of the steady-state current in tubular electrodes

Meschi, Peter Lawrence; Johnson, Dennis C.

doi:10.1021/ac50058a035

Cited by 17 publications

(3 citation statements)

References 20 publications

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“…Notice, however, that there is a peak shape dependence of the current of a factor of as much as 2 which is not predicted by any steady-state current equation and that there is in both cases an entirely unreasonable intercept (i at 0 = 0). The actual dependencies of i on 0 may be inferred from a log-log plot such as Figure 4 (17). For the chromatographic peaks, the power of U is about 0.05, and for the exponential peak it is about 0.20.…”

Section: Resultsmentioning

confidence: 99%

Theoretical and practical limitations on the optimization of amperometric detectors

Elbicki¹,

Morgan²,

Weber³

1984

Anal. Chem.

126

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When steady-state equations for hydrodynamic current In amperometric detectors are integrated, they can be used to characterize detectors using flow-injection experiments. The peak area is Independent of peak shape. This quick, reliable method gives Information necessary to relate experimental results with theory. Once this Is determined, optimization can be considered by examining the graphical region where five Inequalities derived from boundary conditions are satisfied-The wall-jet and channel thin-layer cells were studied in detail.

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Section: Resultsmentioning

confidence: 99%

Theoretical and practical limitations on the optimization of amperometric detectors

Elbicki¹,

Morgan²,

Weber³

1984

Anal. Chem.

126

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“…N , N , N ‘, N ‘-Tetramethyl-1,4-phenylene diamine (TMPD) (Aldrich, 98%) was used as received, and tetrabutylammonium perchlorate (TBAP) (Fluka, 99.9%) acted as the background electrolyte. In all cases, the solutions were degassed with predried nitrogen for 15 min before flowing under gravity , through the MECR devices. Voltammetric measurements at the microband electrodes were carried out using an ECO CHEMI PGSTAT 100.…”

Section: Methodsmentioning

confidence: 99%

Voltammetry under Microfluidic Control: Computer-Aided Design Development and Application of Novel Microelectrochemical Reactors

2003

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We describe the development, numerical quantification, and application of a new class of microelectrochemical reactors (MECR). The reactors were fabricated using standard photolithographic techniques and a photosensitive propriety glass to yield structurally well-defined rectangular ducts of the following critical dimensions: height 25-100 µm, width 100-500 µm, and length 1-10 cm. Separate microelectrode sensors were constructed on a base plate, and the two components were bonded to yield the MECR. Finite element (FE) simulations were carried out to aid in the design and quantification of the voltammetric analysis performed using the new devices. The numerical results revealed the 3D fluid dynamic and mass transport behavior within these cells and were used to quantify the variation of the 3D current density at the working electrode as a function of the transport rate through the cell. Experimental MECR studies were undertaken using aqueous and organic solutions containing ferrocene and potassium ferrocyanide to establish the experimental variation of the electrolysis current as a function of the solution flow rate. In both the numerical and experimental cases, a well-defined relationship between the mass-transport-limited current and volume flow rate was observed, and quantitative agreement between theory experiment was obtained for all cases explored.

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“…The tubular electrode lends itself to numerical analysis due to the welldefined flow pattern within it. Much theoretical and experimental work at single tube electrodes has been reported previously, building on work which gave analytical results for the Lévêque (thin diffusion layer) limit [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Theory of collection efficiencies in the double tubular hydrodynamic electrode

Thompson

Compton

2005

Journal of Electroanalytical Chemistry

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Flow-rate independent component of the steady-state current in tubular electrodes

Abstract: The limiting steady-state response of tubular electrodes is predicted by the equation /" = nFAK¡ V¡ Cb, where a is 1/3. Practical electrodes frequently respond according to the equation but with slight deviations of a from V3. Linear

Cited by 17 publications

References 20 publications

Theoretical and practical limitations on the optimization of amperometric detectors

Theoretical and practical limitations on the optimization of amperometric detectors

Voltammetry under Microfluidic Control: Computer-Aided Design Development and Application of Novel Microelectrochemical Reactors

Theory of collection efficiencies in the double tubular hydrodynamic electrode

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