scholarly journals The theoretical description for the electrochemical determination of 4-4´-dihydroxyazobenzene, assisted by a composite of squaraine dye with cobalt (iii) oxyhydroxide in pair with cobalt (iv) oxide

2020 ◽  
Vol 10 (6) ◽  
pp. 619
Author(s):  
Volodymyr Valentynovych Tkach ◽  
Marta V. Kushnir ◽  
Oleksandra V. Ahafonova ◽  
Mariia P. Mytchenok ◽  
Andrii V. Bocharov ◽  
...  
Keyword(s):  
Double Electric Layer ◽  
Electrochemical Determination ◽  
Theoretical Description ◽  
The Other ◽  
System A ◽  
Diffusion Controlled ◽  
Squaraine Dye ◽  
Efficient Diffusion ◽  
Biological Liquids

<p>The theoretical description for 4-4´-dihydroxyazobenzene CoO(OH) – assisted electrochemical determination in the mushroom pulp, food, and biological liquids has been described. In this system, a squaraine dye is used as a Cobalt(III)oxyhydroxide stabilizer and electron transfer mediator. It is shown that, contrary to the large part of the systems with cobalt (III) oxyhydroxide, this system will behave more stably, providing an efficient diffusion-controlled process. On the other hand, the oscillatory and monotonic instabilities, although possible, are caused by the double electric layer influences of either chemical or electrochemical stage.</p>

scholarly journals The Theoretical Description for the Electrochemical Determination of Anti-COVID-19 Drug Umifenovir, Assisted by a Poly(squaraine dye-co-naphthoquinones) Composite with CoO(OH), Paired with CoO2

2020 ◽  
Vol 10 (1) ◽  
pp. 1962-1968
Keyword(s):  
Mathematical Model ◽  
Bifurcation Analysis ◽  
Double Electric Layer ◽  
Electrochemical Determination ◽  
Theoretical Description ◽  
Oscillatory Behavior ◽  
Linear Stability Theory ◽  
Squaraine Dye ◽  
First Time

For the first time, the system with anti-COVID19 drug umivenofir electrochemical determination, assisted by a Squaraine Dye – CoO(OH)/CoO2 composite, has been described theoretically. The mechanism contains hydrolysis, chemical, and electrochemical oxidation stages. The correspondent mathematical model has been developed and analyzed using linear stability theory and bifurcation analysis. Despite the branched character of the mechanism, the composite of Squaraine Dye with CoO(OH)/CoO2 may be an efficient electrode modifier for the umivenofir determination. However, the oscillatory behavior may be possible, but only because of double electric layer influences on the electrochemical stage.

scholarly journals Theoretical Description for Chlorantraniliprole Electrochemical Determination, Assisted by Squaraine Dye Nano Ag2O2 Composite

2020 ◽  
Vol 11 (2) ◽  
pp. 9278-9284
Keyword(s):  
Mathematical Model ◽  
Reaction Mechanism ◽  
Bifurcation Analysis ◽  
Electrochemical Determination ◽  
Theoretical Description ◽  
The Other ◽  
Linear Stability Theory ◽  
Oxide Nanoparticles ◽  
Monotonic Instability ◽  
Squaraine Dye

The theoretical description for the chlorantraniliprole electrochemical determination, assisted by the hybrid composite of squaraine dye with Ag2O2 nanoparticles, has been described. The correspondent reaction mechanism has been proposed, and the correspondent mathematical model has been developed and analyzed by means of linear stability theory and bifurcation analysis. It has been shown that the chlorantraniliprole electrochemical anodic determination on high potential may be efficiently provided by silver (I, III) oxide nanoparticles, stabilized by the squaraine dye. On the other hand, the oscillatory and monotonic instability is also possible, being caused by DEL influences of the electrochemical stage.

Chronopotentiometric Study of the Electrooxidation of Borohydride Anion in Alkaline Medium

2006 ◽  
Vol 258-260 ◽  
pp. 333-339 ◽  
Author(s):  
Diogo M.F. Santos ◽  
César A.C. Sequeira
Keyword(s):  
Oxidation Process ◽  
Electrochemical Determination ◽  
Transfer Coefficients ◽  
Oxidation Activity ◽  
Rate Determining Step ◽  
System A ◽  
Diffusion Controlled ◽  
Direct Borohydride Fuel Cells ◽  
Gold Sphere

Borohydrides present interesting options for electrochemical power generation acting either as hydrogen sources or anodic fuels for direct borohydride fuel cells and batteries. Though there have been several papers concerning electrochemical determination of relevant thermodynamic and kinetic parameters to the borohydride system, a number of its basic aspects have not been yet systematically studied. In this paper we report chronopotentiometric studies of the electrooxidation of sodium borohydride at a gold sphere electrode in 2M NaOH solutions, at temperatures ranging from 25 to 55 °C. Gold displayed a rather good BH4 - oxidation activity, and the overall oxidation process was shown to be irreversible involving a number of electrons very close to the theoretically expected value of 8. The results suggested that the rate-determining step is an irreversible, diffusion controlled, one-electron oxidation step, for which the transfer coefficients were calculated.

scholarly journals Electrochemical Determination of Sudan Dyes and Two Manner to Realize it: a Theoretical Investigation

2020 ◽  
Vol 9 (4) ◽  
pp. 1451-1458
Keyword(s):  
Mathematical Models ◽  
Bifurcation Analysis ◽  
Stability Theory ◽  
Electrochemical Determination ◽  
Theoretical Description ◽  
Point Of View ◽  
Linear Stability Theory ◽  
Sudan Dyes ◽  
Monotonic Instability

In this work, a general theoretical description of the electrochemical determination of Sudan dyes by cathodic and anodic route has been made. Two mathematical models have been developed for each case, being, afterward, analyzed by means of linear stability theory and bifurcation analysis. It has been shown that in both cases, the systems are efficient from the electroanalytical point of view. The possibility for the oscillatory and monotonic instability has also been verified.

scholarly journals The Theoretical Description for Fluoxetine Electrochemical Determination, Assisted by CoO(OH)-Nanoparticles, Deposited Over the Squaraine Dye

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Volodymyr Valentynovych Tkach ◽  
Marta V. Kushnir ◽  
Silvio César De oliveira ◽  
Hanifa Zh. Salomova ◽  
Fazliddin Jalilov ◽  
...  
Keyword(s):  
Electrochemical Determination ◽  
Theoretical Description ◽  
Squaraine Dye

scholarly journals Automatic determination of the dual system width of to a bivalent system

2018 ◽  
Vol XIX (1) ◽  
pp. 58-64
Author(s):  
Vasiliu Paul
Keyword(s):  
Dual System ◽  
The Other ◽  
Automatic Determination ◽  
Stable States ◽  
System A ◽  
Minimum Number

A system is a set of elements that can be found in one of the following states: operating state and fault. Any system has two stable states: functioning and defect, which is why, in the theory of reliability, it is called a bivalent system. A subset of defective elements is called the system cut if all the other elements of the system are in operation and the system is defective. The width of a bivalent system is equal to the minimum number of elements the system cuts have. In this paper is presented an algorithm for automatic determination of the dual system width to a bivalent system, a Matlab script that implements the algorithm, a case study and subsequent directions of development.

scholarly journals The Theoretical Description for the Perylaldehyde Aldoxime Electrochemical Determination, Assisted by the Novel Squaraine Dye – VO(OH) - Composite

2020 ◽  
Vol 12 (3) ◽  
Author(s):  
Volodymyr Valentynovych Tkach ◽  
Marta V. Kushnir ◽  
Oleksandra V. Ahafonova ◽  
Igor G. Biryuk ◽  
Silvio C. De oliveira ◽  
...  
Keyword(s):  
Electrochemical Determination ◽  
Theoretical Description ◽  
The Novel ◽  
Squaraine Dye

scholarly journals Theoretical Description for Sunset Yellow Electrochemical Determination in Food, Assisted by Poly(3,4-ethylenedioxypyrrole) – VO(OH) Composite

2020 ◽  
Vol 11 (4) ◽  
pp. 11519-11524
Keyword(s):  
Bifurcation Analysis ◽  
Double Electric Layer ◽  
Electrochemical Determination ◽  
Theoretical Description ◽  
Equation Model ◽  
Linear Stability Theory ◽  
Sunset Yellow ◽  
Ionic Force ◽  
Cyclic Changes ◽  
Ionic Forms

In this work, the possibility for sunset yellow electrochemical determination, assisted by the composite of VO(OH) with conducting polymer, has been evaluated theoretically. The correspondent balance equation model of three variables has been developed and analyzed by means of linear stability theory and bifurcation analysis. The oscillatory and monotonic instabilities are shown to be manifested more probably than for the simplest case. The double electric layer (DEL) is influenced by the cyclic changes of ionic force observed during ionic forms' chemical transformation. Nevertheless, the CP – VO(OH) composite may be considered an efficient electrode modifier for yellow sunset determination.

scholarly journals Theoretical Description for Omeprazole Cathodical Electrochemical Determination, Assisted by Omeprazole Electrochemical Determination, Assisted by the Composite Poly(1,2,4-triazole) – VO(OH)

2021 ◽  
Vol 12 (3) ◽  
pp. 3012-3018
Keyword(s):  
Active Substance ◽  
Reduction Process ◽  
Pharmaceutical Formulations ◽  
Electrochemical Determination ◽  
Theoretical Description ◽  
Vanadium Compound ◽  
Process Behavior ◽  
Biological Liquids ◽  
Tetravalent State

In this work, we describe theoretically the possibility of omeprazole electrochemical determination, assisted by the composite containing vanadium oxyhydroxide as an active substance and the polymer of 1,2,4-triazolic derivative as a mediator. The omeprazole molecule undergoes a sulfoxide to sulfide reduction process over a trivalent vanadium compound. The vanadium oxyhydroxide, at its turn, may be oxidized to a tetravalent state, represented in two forms. The electroanalytical process behavior will be illustrated by a trivariate equation-set, analysis of which confirms the efficiency of the composite of poly (1,2,4-triazole) with VO(OH). Vanadium (III) oxyhydroxide may be efficiently used for omeprazole detection both in pharmaceutical formulations, food, and biological liquids.

scholarly journals The Theoretical Description for Ag2O2/Squaraine Dye – Metformin Electrochemical Determination

2020 ◽  
Vol 12 (4) ◽  
Author(s):  
Volodymyr Valentynovych Tkach ◽  
Marta V. Kushnir ◽  
Yana G. Ivanushko ◽  
Valentyna G. Ostapchuk ◽  
Svitlana P. Melnychuk ◽  
...  
Keyword(s):  
Electrochemical Determination ◽  
Theoretical Description ◽  
Squaraine Dye
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