Electrochemical impedance and conductivity measurements in a heterogeneous Fe powder particle—electrolyte system with or without electrochemical reaction

Gál, Miroslav; Hı́veš, Ján; Benová, M.; Gálová, Miriam

doi:10.1007/s10800-007-9306-4

Cited by 4 publications

(12 citation statements)

References 16 publications

(20 reference statements)

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“…When a passive RC circuit with electrical parameters corresponding to the typical BLMs formed in our laboratory was analyzed using electrochemical impedance spectroscopy, results similar to those obtained for pure phosphatidylcholine membranes at low current density values (no electroporation) were obtained [17, 30]. Impedance spectroscopy is a noninvasive technique capable of accurately measuring electrical parameters [31–33]. …”

Section: Resultsmentioning

confidence: 86%

Pore Formation in Lipid Bilayer Membranes made of Phosphatidylcholine and Cholesterol Followed by Means of Constant Current

Naumowicz

Figaszewski

2012

Cell Biochem Biophys

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This paper describes the application of chronopotentiometry to lipid bilayer research. The experiments were performed on bilayer lipid membranes composed of phosphatidylcholine and cholesterol and formed using the painting technique. Chronopotentiometric (U = f(t)) measurements were used to determine the membrane capacitance, resistance, and breakdown voltage as well as pore conductance and diameter.

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Section: Resultsmentioning

confidence: 86%

Pore Formation in Lipid Bilayer Membranes made of Phosphatidylcholine and Cholesterol Followed by Means of Constant Current

Naumowicz

Figaszewski

2012

Cell Biochem Biophys

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“…It is quite simple because no electrochemical reaction takes place on the particle surface and no contact impedance can be measured as in the case of iron particles. 14 The accuracy of this circuit is demonstrated in Fig. 4.…”

Section: Resultsmentioning

confidence: 96%

“…In our previous paper, the important role of electrochemical reaction taking place on the surface of the particles in such a system was demonstrated and a simplified theoretical model was proposed. 14 The role of the conductivity of suspended powder particles on the charge transfer will be discussed in this paper.…”

Section: Resultsmentioning

confidence: 99%

“…[2][3][4][5][6][7][8] However, only a few researchers describe the behavior of SHSs. [9][10][11][12][13][14] The mechanism of charge transfer through a heterogeneous system may differ even for the same system, depending on the conditions, and it is affected by various parameters. In our previous paper, we tried to solve the "electrolyte problem."…”

mentioning

confidence: 99%

“…In our previous paper, we tried to solve the "electrolyte problem." 14 The conclusion was drawn that the role of the electrochemical reaction proceeding at the particle surface in the charge transfer in a SHS must be emphasized.…”

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confidence: 99%

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Electrochemical Impedance Measurements on a Stirred Heterogeneous System of Conductive/Nonconductive Powder Particles Electrolyte

Hı́veš

Gál

Benová

et al. 2008

J. Electrochem. Soc.

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The participation of solid conductive Cu and nonconductive Al 2 O 3 powder particles in charge transfer through a stirred heterogeneous system was studied by means of electrochemical impedance spectroscopy. A different behavior was encountered for Cu and Al 2 O 3 powder particles in a CuSO 4 electrolyte. From impedance diagrams, the formation of aggregates and chains of Cu particles is deduced. The important role of the electrochemical reaction taking place at the surface of the particles for the charge transfer behavior in stirred heterogeneous systems must be emphasized. Furthermore, a simple model of a system consisting of nonconducting particles was proposed and, adopting this model, some calculations and comparisons to experimental data were made.

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Anomalous Coating of Iron Microparticles by Ni–Co Layers in the 3D Stirred Heterogeneous System: Impedance Study

Gál

Oriňáková

Wiemhöfer

et al. 2009

J. Electrochem. Soc.

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A high level controlled electrochemical metal plating of the homogeneous, uniform, and adhesive Ni-Co nano-/microlayer on an Fe microparticle powder substrate in the stirred heterogeneous system ͑SHS͒ is reported. The influence of the volume fraction of suspended powder particles on the partial current efficiency of the electrolytic coating process is evaluated using electrochemical impedance spectroscopy. The role of both the solid Fe powder microparticles and the electrochemical deposition of binary coating on the particle surface of the charge-transfer mechanism through SHS is discussed. The equivalent circuit on the porous electrode model is proposed and, adopting this approach, some calculations and simulations of the experimental data are done. The optimal volume fraction of solid particles in the charge transfer of our SHS is suggested. The formation of permanent aggregates of powder microparticles during the electrolysis is proved. Scanning electron microscopy, optical microscopy, atomic absorption spectroscopy, and energy dispersive X-ray spectroscopy are used to characterize the coating on the microparticle surface.Electrochemical techniques are frequently used for the industrial production of metallic coatings of various compositions and properties. The aim is to improve the service life and to widen the application of standard materials as well as the preparation of materials with unusual properties. In the optimal case, every particle of the powder is coated by the plating metal͑s͒, thus ensuring a high homogeneity of the final product. Perfect homogeneity, uniformity, evenness, adhesiveness of the metallic coating of the product, and a high level of control in the overall process are the main advantages of electrochemical metal plating of the powder substrate in both the fluidized bed electrodes ͑FBEs͒ and the stirred heterogeneous system ͑SHS͒. 1,2Solid metalized or metallic particles may be dispersed either by a vertical flow of the electrolyte ͑in FBE͒ 3 or by a mechanical stirring of the electrolyte ͑in SHS͒. 4 The dispersed particles intermittently come into contact with a solid electrode to be charged and thereby coated with a metallic layer. This electrochemical reactor system possesses various advantages, in particular, a significantly larger reaction area and enhanced mass transport.Considerable attention has been paid to the FBE research. Several authors have studied and modeled in detail the charge and mass transfer through such beds. 5-10 However, few research groups describe the charge transfer and electrochemical plating mechanism in SHS. [11][12][13][14][15][16][17][18][19][20][21][22] In the present work SHS was used. In our laboratories, research has been done on the electrochemical deposition of one-component Ni and Cu coatings and binary Ni-based ͑Ni-Cu, Ni-Co͒ coatings on Fe powder materials. [11][12][13][14][15][16][17][18]20 Serious interest is still devoted to the investigation of electrodeposition of iron group metals because of their interesting mechanical and magnetic prope...

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Electrochemical impedance and conductivity measurements in a heterogeneous Fe powder particle—electrolyte system with or without electrochemical reaction

Cited by 4 publications

References 16 publications

Pore Formation in Lipid Bilayer Membranes made of Phosphatidylcholine and Cholesterol Followed by Means of Constant Current

Pore Formation in Lipid Bilayer Membranes made of Phosphatidylcholine and Cholesterol Followed by Means of Constant Current

Electrochemical Impedance Measurements on a Stirred Heterogeneous System of Conductive/Nonconductive Powder Particles Electrolyte

Anomalous Coating of Iron Microparticles by Ni–Co Layers in the 3D Stirred Heterogeneous System: Impedance Study

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