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42 results on '"Knyazeva, L."'

17. Anticorrosion Properties of Superhydrophobic Copper Surface Coatings Obtained by Electrodeposition.

Author

Knyazeva, L. G., Tsygankova, L. E., Curyato, N. A., Dorokhov, A. V., Uryadnikov, A. A., and Dorokhova, A. N.

Abstract

Superhydrophobic coating is obtained by cathodic deposition of copper from a solution of 0.25 M CuSO4 + 0.5 M H2SO4 at a current density of 0.25 A/cm2 for 30 s on copper foil, followed by exposure to 0.01 M ethanolic solution of stearic acid for 1 h. The wetting angle of the water-formed coating is 155°–157°. Corrosion testing of copper samples with the resulting coating is carried out in a temperature-humidity chamber for 40 days, in an atmosphere with 100% humidity for 186 days and under conditions typical for livestock buildings, at 100% humidity and in the presence of CO2 corrosion accelerators, H2S and NH3 in pairs and simultaneously all three in maximum permissible concentrations for 46–56 days. In all cases, the coatings retain their superhydrophobicity, the wetting angle either remained almost unchanged or decrease by 2°–3°, and there is no corrosion damage on the samples. The influence of the copper electrodeposition mode from the solution of 0.25 M CuSO4 + 0.5 M H2SO4 on the wetting angle of the resulting coating is evaluated. [ABSTRACT FROM AUTHOR]

Published
2023
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28. A Study of the WO3/GO Electrochromic Films Obtained by the Electrochemical Deposition Route: Optical and Electromagnetic Method.

Author

Shchegolkov, A. V., Knyazeva, L. G., Komarov, F. F., and Parfimovich, I. D.

Subjects
*ELECTROCHROMIC effect, *GRAPHENE oxide, *TUNGSTEN trioxide, *OPTICAL properties, *NANOCOMPOSITE materials
Abstract

The optical and electromagnetic properties of graphene oxide (GO)-modified WO3 electrochromic nanocomposite films obtained by electrochemical deposition of the W and GO ions from a solution synthesized using peroxotungstic acid (PTA) with the addition of GO were studied. Controlled electrochemical deposition of electrochromic WO3 films was carried out by the multistage amperometry (MSA) procedure in which the initial and final values of the electrodeposition potential of –0.5 and –1.5 V, as well as the number of cycles were set. [ABSTRACT FROM AUTHOR]

Published
2021
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35. Evaluation of the Protective Efficiency of IFKhAN-114 Volatile Inhibitor against Atmospheric Corrosion of Copper by Polarization Measurements.

Author

Vigdorovich, V. I., Tsygankova, L. E., Knyazeva, L. G., Shel', N. V., Dorokhova, A. N., and Vigdorowitsch, M. V.

Abstract

To simulate conditions for evaluating the inhibition efficiency of an IFKhAN-114 volatile inhibitor under atmospheric corrosion of copper in the presence in the air of two corrosion promoters CO2 + NH3 or H2S + NH3, polarization measurements were performed. For this purpose, 0.1 M NaCl solution containing, in a wide range of concentrations, the products of the hydrolysis of ammonium carbonate or ammonium sulfide was used. Comparison of the data obtained through weight loss tests (the first method) and polarization measurements (the second method) showed that the latter approach allows obtaining only qualitative data, which, however, requires significantly less time than the first one. [ABSTRACT FROM AUTHOR]

Published
2019
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38. The question of the abundance of metals in stars with planets.

Author

Knyazeva, L.

Subjects
*COSMIC abundances, *STELLAR atmospheres, *PLANETS, *SOLAR system, *INTERSTELLAR molecules, *COSMOCHEMISTRY
Abstract

The metal-poor stars with planets were compared with the metal-rich stars also with planets. The high [Fe]/[H] values obtained from the spectroscopic analysis for most stars with planets can be consequence of the fact that the models used are inadequate for real stellar atmospheres. [ABSTRACT FROM AUTHOR]

Published
2005
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39. G0–G5V Stars and the Sun in the u[vee]by System.

Author

Knyazeva, L. N. and Kharitonov, A. V.

Subjects
SPECTRAL energy distribution, SUN observations, PHOTOMETRY
Abstract

The color indices of the Sun in the u[vee]by system are calculated using the spectral energy distribution of Lockwood, Tug, and White. This allows errors in the absolute calibration to be excluded from the calculated color indices. The normal position of the Sun on the ([vee] – b)–(b–y) and ([vee] – y)–(b–y) color–color diagrams for early G stars testifies to the absence of any significant peculiarities in the Sun compared to other stars of similar spectral type. These diagrams can provide a useful tool in searches for candidate solar analogues among faint stars. © 2000 MAIK “Nauka / Interperiodica”. [ABSTRACT FROM AUTHOR]

Published
2000
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