Papers by Gennady Ostapenko
Journal of The Electrochemical Society, Jul 19, 2023
The kinetics of the redox Fe2+/Fe3+ reaction on a platinum electrode in 1 M HClO4 was studied by ... more The kinetics of the redox Fe2+/Fe3+ reaction on a platinum electrode in 1 M HClO4 was studied by the chronoamperometric method in the presence of the hexylamine surfactant. The main kinetic characteristics of the reaction have been estimated. The dependence of the exchange current density on the hexylamine concentration was analyzed. It was found that the hexylamine adsorption on platinum is described by the Dhar-Flory-Huggins isotherm. It is shown that the hexylamine adsorption on platinum is mainly due to the hydrophobic effect of the hexylamine molecules interaction with polar water molecules.
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Molecules, Jun 28, 2023
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Известия Самарского научного центра Российской академии наук, 2003
The investigations are carried out by potentiostatic method. It is found out, that on the heteroj... more The investigations are carried out by potentiostatic method. It is found out, that on the heterojunction the copper dissolution-deposition electrochemical reaction takes place depending on potential. sign. In the interval 10 mV 120 mV the reaction rate is limited by charge transport at exchange current density of 2,7 mA cm-2 and anodic transfer coefficient approximately 0,45.
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Russian Chemical Bulletin, Sep 1, 2018
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Journal of Fluorine Chemistry, Jul 1, 2014
Abstract A new synthetic protocol for the synthesis of 1,4,5-trisubstituted imidazoles containing... more Abstract A new synthetic protocol for the synthesis of 1,4,5-trisubstituted imidazoles containing trifluoromethyl group has been developed using van Leusen reaction, which incorporates two-component condensation reaction trifluoroacetimidoyl chlorides with tosylmethylisocyanide. This protocol provides a novel and improved method for obtaining trifluoromethyl containing 1,4,5-trisubstituted imidazoles in good yields.
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Известия Самарского научного центра Российской академии наук, 2000
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Chemistry of Heterocyclic Compounds, Aug 3, 2014
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Chemistry of Heterocyclic Compounds, Aug 14, 2013
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ECS transactions, Dec 19, 2019
Potentiostatic growth of copper microcrystals is investigated on titanium nitride substrate. Elec... more Potentiostatic growth of copper microcrystals is investigated on titanium nitride substrate. Electrodeposition occurs at overvoltages more than 30...35 mV. Progressive nucleation with three-dimensional growth under the diffusion control is observed at comparatively lower overvoltages. The trend of the deviation to the instantaneous nucleation occurs at increased overvoltages. Pentagonal copper microcrystals are preferentially formed at 40...60 mV overvoltages.
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Magnetic Resonance in Chemistry, Jul 25, 2014
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Meeting abstracts, May 1, 2020
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Journal of Solid State Electrochemistry, Apr 6, 2001
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Chemistry of Heterocyclic Compounds, Mar 1, 2013
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Russian Chemical Bulletin, Aug 1, 1971
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Известия Самарского научного центра Российской академии наук, 2001
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Известия Самарского научного центра Российской академии наук, 2003
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Meeting abstracts, Jul 7, 2022
Adsorption is one of the electrochemical process stages often. The adsorption of polar organic mo... more Adsorption is one of the electrochemical process stages often. The adsorption of polar organic molecules (surfactants) on metal electrodes is of significant interest. In particular, the surfactant adsorption affects the exchange current value and determines the metal corrosion rate. Therefore, the explanation of the adsorption mechanism is the most important problem in the investigation of the electrochemical kinetics. The kinetics of the Fe2+ and Fe3+ oxidation-reduction reaction on a platinum electrode in 1 M HClO4 was investigated by potentiodynamic and chronoamperometric methods in the presence of hexylamine as a surfactant. The main kinetic characteristics of the reaction (exchange current density, transfer coefficient, diffusion coefficients of iron ions) have been determined. The dependence of the exchange current density on the hexylamine concentration is analyzed. The surface coverage with a surfactant was estimated at various hexylamine concentrations. It was shown that the hexylamine adsorption on platinum is described by the Dhar-Flory-Huggins adsorption isotherm. The values of the adsorption constant and the adsorption free energy are obtained. These values are close to the corresponding values for the hexylamine adsorption on mild steel in hydrochloric acid. Consequently, the objective laws for the hexylamine adsorption depend low on the acid type and the electrode nature. This indicates the physical adsorption of the surfactant. It is possible that adsorption occurs due to the hydrophobic interaction of the surfactant molecules with polar water molecules. Then, the displacement of surfactant molecules to the interface takes place regardless of the nature of the acid and the metal contacting with the solution. The latter assumption requires further investigations of the surfactant adsorption on various metals.
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Ionics, May 1, 1999
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Acta Crystallographica Section E-structure Reports Online, Mar 13, 2013
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Corrosion Science, May 1, 2014
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Papers by Gennady Ostapenko