Oxygen and SO2 Consumption of Different Enological Tannins in Relationship to Their Chemical and Electrochemical Characteristics

Supported lipid membranes are widely used platforms which serve as simplified models of cell membranes. Among numerous methods used for preparation of planar lipid films, self-assembly of bicelles appears to be promising strategy. Therefore, in this paper we have examined the mechanism of formation and the electrochemical properties of lipid films deposited onto thioglucose-modified gold electrodes from bicellar mixtures. It was found that adsorption of the bicelles occurs by replacement of interfacial water and it leads to formation of a double bilayer structure on the electrode surface. The resulting lipid assembly contains numerous defects and pinholes which affect the permeability of the membrane for ions and water. Significant improvement in morphology and electrochemical characteristics is achieved upon freeze–thaw treatment of the deposited membrane. The lipid assembly is rearranged to single bilayer configuration with locally occurring patches of the second bilayer, and the number of pinholes is substantially decreased. Electrochemical characterization of the lipid membrane after freeze–thaw treatment demonstrated that its permeability for ions and water is significantly reduced, which was manifested by the relatively high value of the membrane resistance.

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Structure and electrochemical characteristics of composites based on multi-walled carbon nanotubes and manganese oxide

10.1063/5.0034223 ◽

2020 ◽

Author(s):

S. N. Nesov ◽

P. M. Korusenko

Keyword(s):

Carbon Nanotubes ◽

Manganese Oxide ◽

Electrochemical Characteristics ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

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Electrochemical characteristics of activated carbon/Ppy electrode combined with P(VdF-co-HFP)/PVP for EDLC

Electrochimica Acta ◽

10.1016/j.electacta.2004.02.059 ◽

2004 ◽

Vol 50 (2-3) ◽

pp. 863-872 ◽

Cited By ~ 26

Author(s):

Kyong-Min Kim ◽

Jin-Woo Hur ◽

Se-Il Jung ◽

An-Soo Kang

Keyword(s):

Activated Carbon ◽

Electrochemical Characteristics

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Label-Free Electrochemical Test of Protease Interaction with a Peptide Substrate Modified Gold Electrode

Chemosensors ◽

10.3390/chemosensors9080199 ◽

2021 ◽

Vol 9 (8) ◽

pp. 199

Author(s):

Anna Wcisło ◽

Izabela Małuch ◽

Paweł Niedziałkowski ◽

Tadeusz Ossowski ◽

Adam Prahl

Keyword(s):

Gold Electrode ◽

High Selectivity ◽

Electrode Materials ◽

Electrochemical Biosensors ◽

Electrochemical Characteristics ◽

Label Free ◽

Peptide Substrate ◽

Electrochemical Test ◽

Experimental Conditions ◽

Spectrofluorimetric Method

Efficient deposition of biomolecules on the surface, maintaining their full activity and stability, is a most significant factor in biosensor construction. For this reason, more and more research is focused on the development of electrochemical biosensors that have the ability to electrically detect adsorbed molecules on electrode surface with high selectivity and sensitivity. The presented research aims to develop an efficient methodology that allows quantification of processes related to the evaluation of enzyme activity (proprotein convertase) using electrochemical methods. In this study we used impedance spectroscopy to investigate the immobilization of peptide substrate (Arg-Val-Arg-Arg) modified with 11-mercaptoundecanoic acid on the surface of gold electrode. Both the synthesis of the peptide substrate as well as the full electrochemical characteristics of the obtained electrode materials have been described. Experimental conditions, including concentration of peptide substrate immobilization, modification time, linker, and the presence of additional blocking groups have been optimized. The main advantages of the described method is that it makes it possible to observe the peptide substrate–enzyme interaction without the need to use fluorescent labels. This also allows observation of this interaction at a very low concentration. Both of these factors make this new technique competitive with the standard spectrofluorimetric method.

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Synthesis and Electrochemical Properties of TiNb2O7 and Ti2Nb10O29 Anodes under Various Annealing Atmospheres

Metals ◽

10.3390/met11060983 ◽

2021 ◽

Vol 11 (6) ◽

pp. 983

Author(s):

Touraj Adhami ◽

Reza Ebrahimi-Kahrizsangi ◽

Hamid Reza Bakhsheshi-Rad ◽

Somayeh Majidi ◽

Milad Ghorbanzadeh ◽

...

Keyword(s):

Electrochemical Properties ◽

Annealing Treatment ◽

Lithium Ion ◽

Argon Atmosphere ◽

Oxygen Atmosphere ◽

Annealing Atmosphere ◽

Electrochemical Characteristics ◽

X Ray Diffraction ◽

Lower Capacity ◽

Discharge Capacities

In this study, two compounds of TiNb2O7 and Ti2Nb10O29 were successfully synthesized by mechanochemical method and post-annealing as an anode material for lithium-ion batteries. The effect of annealing atmosphere on the morphology, particle size, and electrochemical characteristics of two compounds was investigated. For these purposes, the reactive materials were milled under an argon atmosphere with a certain mole ratio. Subsequently, each sample was subjected to annealing treatment in two different atmospheres, namely argon and oxygen. Phase and morphology identifications were carried out by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) to identify the phases and evaluate the morphology of the synthesized samples. The charging and discharging tests were conducted using a battery-analyzing device to evaluate the electrochemical properties of the fabricated anodes. Annealing in different atmospheres resulted in variable discharge capacities so that the two compounds of TiNb2O7 and Ti2Nb10O29 annealed under the argon atmosphere showed a capacity of 60 and 66 mAh/g after 179 cycles, respectively, which had a lower capacity than their counterpart under the oxygen atmosphere. The final capacity of the annealed samples in the oxygen atmosphere is 72 and 74 mAh/g, respectively.

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