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Dive into the research topics where V. V. Emets is active.

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Featured researches published by V. V. Emets.


Journal of Electroanalytical Chemistry | 2000

Electrical double layer on the Cd–Ga liquid alloy in solutions of surface-inactive electrolytes in water, methanol and propylene carbonate

V. V. Emets; B. B. Damaskin

Abstract A novel electrode, liquid Cd (0.3 at.%)–Ga eutectic alloy, was fabricated and studied. Its electrical double layer characteristics were shown to differ markedly from those of a Ga electrode; they are practically identical to those of the Cd electrode. It was found that, in the absence of a metal–solvent chemisorption interaction, the electron capacitance of the Cd–Ga electrode approaches the electron capacitance of the Ga, In–Ga and Tl–Ga electrodes, but differs from that of the Hg electrode. The Cd–Ga electrode resembles the In–Ga electrode in its lyophilic nature. The value of the chemisorption potential drop of solvents (water, propylene carbonate and methanol), obtained with the Cd–Ga electrode, follows the rule characteristic of the Ga, In–Ga and Tl–Ga electrodes, namely, the chemisorption potential drop of a solvent correlates with the metal work function (in vacuo). Mercury does not fall into this pattern, which was explained by the longer distance of the solvent dipoles to the ionic lattice in this metal. The chemisorption interaction of the solvents with the Cd–Ga electrode, like Ga and In–Ga electrodes, is shown to increase with the solvent donor number.


Russian Journal of Electrochemistry | 2010

Comparative study of Cl−, Br−, and I− ions adsorption from dimethyl formamide at Hg- and Ga-electrodes

V. V. Emets; B. B. Damaskin

The adsorption of Cl−, Br−, and I− ions from their 0.1 M solutions in dimethyl formamide at renewable liquid Hg- and Ga-electrodes was studied under similar experimental conditions by the differential-capacitance and jet-electrode methods. The data obtained points out to a strong effect of the metal nature on adsorption parameters and the halogenide-ion surface activity series. The halogenide-ion surface activity at the Hg-electrode increased in the following sequence: Cl− < Br− < I−; at the Ga-electrode, in the reverse sequence: I− < Br− < Cl−. The results are explained qualitatively in terms of the Andersen-Bockris model. It follows from the obtained data that (1) the free energy of the metal-halogenide-ion interaction increases in the following sequence: I− < Br− < Cl−; (2) the free energy of the Ga-halogenide-ion interaction exceeds that of the Hg−halogenide-ion interaction; and (3) the difference of the Cl−, Br−, and I− ions interaction with the metals increased significantly when passing from Hg− to Ga-electrode.


Journal of Electroanalytical Chemistry | 2002

The structure of the electrical double layer on a liquid Pb–Ga alloy in aqueous, propylene carbonate, and formamide solutions of electrolytes

V. V. Emets; B. B. Damaskin

A new atomically smooth renewable electrode is prepared and studied. The electrode is a liquid Pb–Ga alloy containing 0.06 atoms % of Pb. Its double layer characteristics differ drastically from those of a Ga electrode; they are practically identical to the characteristics of a Pb electrode. Thus, the Pb–Ga electrode actually is a model of the electrochemical properties of liquid Pb electrode. The adsorption of anions on the Pb–Ga electrode increases in the sequence BF4−=SO42−<Cl−<Br−<I−. In the absence of metal–solvent chemisorption interaction and at a fixed charge, the ‘metal’ capacitance of the Pb–Ga electrode has an intermediate value between the ‘metal’ capacitances of Ga and Hg electrodes; it practically does not depend on the solvent nature. In relation to water, propylene carbonate and formamide, the Pb–Ga electrode is much less lyophilic than the Ga electrode; its lyophilic nature is practically similar to that of the Hg electrode. For In–Ga, Cd–Ga and Pb–Ga electrodes possessing nearly the same electrochemical work function value, the solvent–chemisorption potential drop is shown to differ significantly; it increases in the sequence Pb–Ga<In–Ga<Cd–Ga, as the distance of the nearest approach of solvent molecules to the ion cores of the metal decreases.


Journal of Electroanalytical Chemistry | 1998

The role of metal and solvent in the structure of the electrode|surface-inactive electrolyte solution interface

I. A. Bagotskaya; B. B. Damaskin; V. V. Emets; V. E. Kazarinov

Abstract The effect of the electronic properties of the metal on the structure of an electric double layer was investigated using Hg, Ga, In–Ga and Tl–Ga electrodes in water, ethanol, n-propanol, acetonitrile, ethylene carbonate and N-methylformamide as examples. In the absence of any chemisorption interaction between the metal and the solvent, the closest distance of solvent dipoles to the surface of Hg was shown to differ from that of the gallium subgroup metals. The difference in these distances depends on the metal nature but not on that of the solvent; it does not depend on the electrode charge either. With due allowance for differences in the distances of solvent dipoles to the surface of different metals, the concept of the lyophilic nature of metals relative to solvents may be altered radically.


Russian Journal of Electrochemistry | 2011

Specific adsorption of chloride ions on liquid Ga electrode from N-methylformamide solutions with constant ionic strength

V. V. Emets; B. B. Damaskin

Differential capacitance curves are measured by mans of an ac-bridge in the system Ga/[N-MF + 0.1m M KCl + 0.1(1 − m) M KClO4] with the surface-active anion taken in the following molar fractions m: 0, 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, and 1. As compared with the other solvents, N-methylformamide (N-MF) makes it possible to realize the highest positive charges of the Ga electrode at which the electrode remains ideally polarizable (up to 20 μC/cm2). The data on the specific adsorption of Cl− ions in the mentioned system can be described qualitatively by the Frumkin isotherm in which the free energy is considered as a linear function of the electrode charge.


Russian Journal of Electrochemistry | 2009

The relation between the potential of zero charge and work function for sp-metals

V. V. Emets; B. B. Damaskin

It is shown that for numerous sp-metals there exists no unified work function (We) dependence of the potential of zero charge Eq = 0 and the potential drop characterizing the metal lyophilic behavior ΔMHgEchem)q = 0. The reason is that the metal work function is by no means the only factor affecting the value of Eq = 0. The quantities Eq = 0 and (ΔMHgEchem)q = 0 depend also on the distance of the solvent dipoles’ closest approach to metal surfaces (dms) in the absence of the metal-solvent chemisorption interaction. When the metal-solvent chemisorption interaction is involved, this distance affects the degree of overlapping of the metal’s acceptor levels and the upper occupied donor levels in the solvent molecules. To reliably investigate the effect of any of these factors on Eq = 0, the other one should be fixed up. It is shown, by example of Ga-, Bi-Gaand Sn-Ga-electrodes, as well as Pb-Ga-, In-Ga-, and Cd-Ga-electrodes demonstrating very close values of the “electrochemical work function” that the metal-solvent chemisorption interaction becomes stronger with the decreasing of dms. The influence of this factor is intensified with the increasing of the solvent’s donor number DN. The We dependence of Eq = 0 and (ΔMHgEchem)q = 0 can be traced by example of metals with nearly equal dms values, e.g., Tl-Ga, In-Ga, and Ga. In all studied solvents, the deviation of Eq = 0 from We increased in the series Tl-Ga < In-Ga < Ga, that is, with the increasing of the metal’s work function in vacuum. The effect is intensified with the increasing of the solvent’s DN. The obtained results agree with the concept of donor-acceptor nature of the metal-solvent chemisorption interaction.


Russian Journal of Electrochemistry | 2012

Specific adsorption of bromide and iodide ions from N-methyl formamide solutions with constant ionic strength on liquid ga electrode

V. V. Emets; B. B. Damaskin

The differential capacitance curves were measured with an ac bridge in the Ga/[N-MF + 0.1 m M KBr + 0.1 (1 − m) M KClO4] and Ga/[N-MF + 0.1 m M KI + 0.1 (1 − m) M KClO4] systems at the following fractions m of surface-active anions: 0, 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, and 1. As compared with other solvents, N-methyl formamide (N-MF) enables one to realize the largest positive charges of Ga electrode, at which it remains ideally polarizable (up to 20 μ/cm2). The data on the specific adsorption of Br− and I− anions in the system can be quantitatively described by the Frumkin’s isotherm; to the first approximation, free energy of halide ion (Hal−) adsorption


Russian Journal of Electrochemistry | 2000

Analysis of experimental data on the EDL capacitance for different metals in asymmetrical electrolytes: Accounting for the solution nonideality

V. V. Emets; B. B. Damaskin

Delta G_{adsHal^{ - 1} }


Russian Journal of Electrochemistry | 2011

Comparative study of Cl−, Br−, and I− ion adsorption from N-methylformamide at Ga-, (In-Ga)-, and (Tl-Ga)-electrodes

V. V. Emets; B. B. Damaskin

is a linear function of electrode charge. It is found that, in contrast to the Hg/N-MF interface,


Russian Journal of Electrochemistry | 2012

Search for a model to describe the specific adsorption of anions A− in Ga/[N-Methylformamide + mc KCl + (1 − m)c KClO4] Systems, where KA is KCl, KBr, or KI

B. B. Damaskin; V. A. Safonov; V. V. Emets

Delta G_{adsHal^{ - 1} }

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V. E. Kazarinov

Russian Academy of Sciences

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I. A. Bagotskaya

Russian Academy of Sciences

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V. Ya. Mishuk

Russian Academy of Sciences

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A.A. Melnikov

Russian Academy of Sciences

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B. M. Grafov

Russian Academy of Sciences

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M. R. Tarasevich

Russian Academy of Sciences

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R. N. Kuklin

Russian Academy of Sciences

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