We study the structure of cobalt coatings obtained by the electrochemical method from methylsulfonate electrolyte. It is shown that the morphology of their surface differs from the morphology of the surface of deposits obtained from sulfate electrolyte by smaller grain sizes and the absence of a certain shape of these grains. The results of X-ray phase diffraction analyses reveal the presence of two modifications of cobalt (α -and β -Co). The hexagonal type of the crystal lattice is predominant. The crystal lattice of the electrolytic deposits of cobalt obtained from the methylsulfonate electrolyte is characterized by the presence of a large number of defects. The distorted crystalline structure with additional lattice defects and decreased mobility of dislocations promotes an increase in the microhardness of cobalt coatings. It is shown that the methylsulfonate and sulfate electrolytes have different buffering properties.Electrolytic cobalt coatings and coatings of cobalt alloys attract significant attention of the researchers due to their specific magnetic properties [1]. Cobalt deposits exhibit perpendicular magnetic anisotropy and, for this reason, cobalt is quite promising for the development of new magnetooptic data-storage devices. Moreover, cobalt coatings are characterized by a relatively high hardness and corrosion resistance. Moreover, cobalt deposited on the nickel substrate exhibits an electrocatalytic activity in the reactions of oxygen and hydrogen release in alkaline solutions.The existence of correlation was established between the parameters of deposition of the coatings (рН value, current density, and temperature) and their magnetic properties (coercive force, residual magnetization, and the rectangular shape of the hysteresis loop). However, the application of this approach is not always reasonable because the replacement of one parameter of electrodeposition leads, as a rule, to changes in several parameters affecting the magnetic behavior of the material. This is why the predicted synthesis of materials with the required magnetic properties becomes more difficult. It seems more convenient to realize the successive determination of the relationship between the conditions of electrodeposition of the coatings and their structural characteristics (phase composition, imperfection of the crystal lattice, and grain sizes) and perform the analysis of the correlation between the structural parameters and the physicochemical properties.The structure of electrochemical coatings can be purposefully changed by varying the conditions of electrodeposition. The influence of the electric parameters of electrodeposition of cobalt on the microstructure and properties of nanocrystalline coatings was studied earlier [2]. The changes in the structure of cobalt films depending on the current density of deposition, acidity of electrolytes, and the density of coating were investigated in [3]. It was shown that, for small thicknesses of the film (up to 50 nm) and the pH value of electrodeposition equal to 7.1, we obs...
Surface activity of sodium dodecylsulfate and micelle formation in solutions based on deep eutectic solvents ethaline and reline (eutectic mixtures of choline chloride with ethylene glycol and urea, respectively) were investigated. The isotherms of surface tension were treated using Langmuir model and the adsorption parameters at the interface «solution/ air» were determined. The change in the nature of a solvent results in a decrease in the adsorption equilibrium constant in the following sequence: water>reline>ethaline>ethylene glycol, which is caused by the corresponding changes in the solvents polarity and intensity of hydrophobic interactions. The critical micelle concentration of sodium dodecylsulfate is equal to 3.5510-3 Ì and 2.1410-3 Ì in solutions based on ethaline and reline, respectively. These values are lower than that in an aqueous medium (8.1110-3 Ì). An increase in the content of water additive in deep eutectic solvents has only a marginal impact on the adsorption equilibrium constant, but leads to an increase in the critical micelle concentration.
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