Direct evidence of concentration and potential profiles in the electrolyte diode

Svoboda, Miloš; Slouka, Zdeněk; Lindner, Jiří; Šnita, Dalimil

doi:10.1016/j.cej.2007.07.027

Cited by 9 publications

(4 citation statements)

References 10 publications

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“…Electrolyte diodes were studied first in the seventies, , but the majority of the papers ,− was published in the last 15 years. Acid−base diodes are interesting from the point of complex systems (“systems chemistry”) and nonlinear chemistry as reaction−diffusion and ionic migration occur here simultaneously.…”

Section: Introductionmentioning

confidence: 99%

“…Simultaneous potential and pH gradients also occur in biological systems, for example, in the inner mitochondrial membrane of the cell . In recent experiments, the connecting element was always a polyvinyl alcohol (PVA) based hydro-gel cross-linked by glutaraldehyde. ,− ,− The gel was applied in a form of a cylinder connecting the two reservoirs, as shown schematically in Figure a. A hydro-gel (like a liquid) allows diffusion and electric migration of the mobile ions, but it suppresses any disturbing advection or convection which would occur in a free liquid.…”

Section: Introductionmentioning

confidence: 99%

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Micropatterned Polyvinyl Butyral Membrane for Acid−Base Diodes

et al. 2010

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Until now, polyvinyl alcohol (PVA) gel cylinders have been used in electrolyte diodes as a connecting element between the acidic and alkaline reservoirs. In this paper, a new connecting element is reported: a breath figure templated polyvinyl butyral (PVB) membrane prepared with dip-coating from a dichloromethane solution of the polymer in a humid atmosphere. The procedure gives a 1.5-2 μm thick membrane with a hexagonal pattern, the average characteristic length of which is 1 μm. After an acidic etching, it was found to be a good connecting element. The voltage-current characteristics and dynamic properties of PVA and PVB were measured and compared. The PVB membrane has a faster response to voltage changes than the PVA gel, but in both cases, there was a slow drift in the current that prevented it from reaching a steady state. Reproducible characteristics can be obtained, however, after the current reaches a well-defined quasi-steady state.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Micropatterned Polyvinyl Butyral Membrane for Acid−Base Diodes

et al. 2010

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“…Roszol et al investigated the effect of both negative and positive salts on an acid–base diode by performing simulations and experiments 13. Snita et al visualized the acid–base boundary using pH indicators and measured the electric potential profile using an array of microelectrodes 14. They also observed the transient behavior of an electrolytic diode in a capillary microfluidic chip 15.…”

Section: Introductionmentioning

confidence: 99%

Ion Flow Crossing Over a Polyelectrolyte Diode on a Microfluidic Chip

Han

Kim

Bae

et al. 2011

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Key evidences are reported for the rectification mechanism of an aqueous ion diode based on polyelectrolytic plugs on a microfluidic chip by monitoring the ion flow crossing over the junction. The ion flow penetrating the polyelectrolyte junction is visualized by employing a fluorescent chemodosimeter, rhodamine B hydrazide and the pH-dependent dye, carboxy-fluorescein. How hysteresis phenomena, exhibited through the nonlinear behavior of the polyelectrolyte diode, are affected by a variety of parameters (e.g., switching potential, scan rate, and electrolyte concentration) is also investigated. The insights and knowledge from this study provide a crucial foundation for ion control at the iontronic diode in the aqueous phase, leading to more advanced aqueous organic computing devices and more diverse applications for microfluidic logic devices.

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“…Acid-base diodes.-This work is focused on the transient modeling of the so-called electrolyte diode (acid-base diode). An electrolyte diode is a complex reaction-diffusion-electric migration [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] system usually embedded into hydrogel medium. The acid-base reaction is between hydrogen (H + ) and hydroxide (OH − ) ions combined with the electrodiffusion of various mobile ions which are imposed due to concentration and potential gradients.…”

mentioning

confidence: 99%

Time-Dependent Modeling of Salt-Contaminated Acid-Base Diodes

Koncz

Noszticzius

Roszol

et al. 2017

J. Electrochem. Soc.

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The paper describes the transient behavior and modeling of the salt contaminated acid-base diode. As an example, a 0.1 M KOH-0.1 M HCl diode (used in previous investigations), where the alkaline and acidic reservoirs are connected by a hydrogel cylinder is studied. First the traditional positive salt effect and the fairly new phenomenon called negative salt effect are discussed for stationary state. In the case of positive salt effect some salt is added to the alkaline reservoir of a reverse biased electrolyte diode and as a result, close to the critical concentration of the added salt, the current increases sharply. The negative salt effect appears as a suppression of the positive one (both sides of the diode are contaminated). Afterward the time-dependent positive and negative salt effect are discussed as a step response to the salt contamination. An application of the diode would be the sensitive detection of nonhydrogen cations in an acidic medium (e.g., in ion chromatography) based on the negative salt effect, thus our first results of suitability are studied and reported as impulse response of the diode.

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Direct evidence of concentration and potential profiles in the electrolyte diode

Cited by 9 publications

References 10 publications

Micropatterned Polyvinyl Butyral Membrane for Acid−Base Diodes

Micropatterned Polyvinyl Butyral Membrane for Acid−Base Diodes

Ion Flow Crossing Over a Polyelectrolyte Diode on a Microfluidic Chip

Time-Dependent Modeling of Salt-Contaminated Acid-Base Diodes

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