共查询到20条相似文献,搜索用时 15 毫秒
1.
V. S. Rudnev T. P. Yarovaya V. S. Egorkin S. L. Sinebryukhov S. V. Gnedenkov 《Russian Journal of Applied Chemistry》2010,83(4):664-670
Effect of the component concentration of an orthophosphate-tetraborate aqueous electrolyte on the thickness, composition,
surface structure, and protective properties of coatings deposited from this electrolyte was studied. 相似文献
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V. S. Rudnev M. A. Medkov T. P. Yarovaya P. M. Nedozorov 《Russian Journal of Applied Chemistry》2012,85(12):1856-1860
Oxide-phosphate coatings were formed in electrolytes with Ca(II) and Sr(II) polyphosphate complexes. The data on an effect of a ratio of metal polyphosphate complexes in the electrolyte, treatment time on an elemental and phase compositions, thickness and morphology of coatings were obtained. The approach is promising for application of the coatings containing calcium phosphate with additives of phosphates of other metals to titanium implants. 相似文献
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V. S. Rudnev V. P. Morozova I. V. Lukiyanchuk M. V. Adigamova I. A. Tkachenko A. Yu. Ustinov P. V. Kharitonskii A. M. Frolov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2014,88(5):863-869
The effect of the nature of the supporting electrolyte in the composition of electrolytic suspensions containing dispersed particles of Fe(III) and Co(II) hydroxides, and of anodic and bipolar anodic-cathodic polarization on features of the formation, composition, and magnetic characteristics of oxide coatings is studied. In all cases, iron and cobalt are incorporated into the coatings and are concentrated predominantly in pores. The pores of the coatings include particles consisting of the reduced metals, presumably surrounded by oxide or hydroxide shells. The electrolyte composition affects the concentration and ratio of the metals in the particles. A correlation is observed between the ferro- or ferrimagnetism of the coatings and the content and ratio of cobalt and iron in the pores. 相似文献
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E. A. Koblova A. Yu. Ustinov V. S. Rudnev I. V. Lukiyanchuk I. V. Chernykh 《Journal of Structural Chemistry》2017,58(6):1129-1136
A series of Ni- and/or Cu-containing coatings formed by plasma electrolytic oxidation on aluminum and titanium are examined by X-ray photoelectron spectroscopy. Binding energies of core electrons, elemental composition, chemical state of elements, and features of the structural organization of the surface and nearsurface layers of the coatings are determined. A combination of the data collected indicates similar regularities of the composition and significant distinctions in the structure of the coatings formed. It is shown that the coatings formed on titanium are characterized by a considerably higher phosphorus concentration, and correspondingly, phosphates, unlike the coatings formed on aluminum, in which base metal and 3d element (Ni or Cu) oxides are dominant. In both cases, Cu is mainly concentrated in the surface layers of the coatings whereas Ni is mainly concentrated in the near-surface layers. 相似文献
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Possibility and conditions of obtaining cerium-containing oxide coatings on titanium alloys by microarc oxidation in electrolytes with tartrate and citrate cerium complexes were determined. The effect of organic cerium complexes on the kinetic parameters of the microarc oxidation of titanium alloys was studied. Porous oxides coatings containing up to 20% cerium were obtained. 相似文献
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V. S. Rudnev M. S. Vasilyeva I. V. Lukiyanchuk I. V. Chernykh 《Russian Journal of Applied Chemistry》2012,85(6):953-956
The possibility of forming Co-containing coatings on titanium by plasma electrolytic oxidation and by a combination of oxidation and impregnation methods using an aqueous solution of sodium silicate as the base electrolyte was examined. Comparative analysis of the composition and structure of the systems obtained and of their activity in oxidation of CO to CO2 was performed. 相似文献
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V. S. Rudnev K. N. Kilin M. A. Medkov I. V. Lukiyanchuk E. E. Dmitrieva 《Russian Journal of Applied Chemistry》2013,86(9):1340-1343
Bioinert, biocompatible, chemical-resistant oxide coatings containing Ta2O5, which are promising to be applied to titanium implants, were produced on titanium by plasma electrolytic oxidation in an aqueous electrolyte. An effect of formation conditions on the elemental and phase composition, thickness, and roughness of the coatings was researched. It was found that an addition of polyethylene glycol to electrolyte without affecting the elemental composition and the thickness causes a change in the porosity and an increase in the roughness of the formed oxide layer. Changing the surface arrangement may allow affecting an adhesion of biotissues to titanium implants with coatings and accumulating drugs by the coatings. 相似文献
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V. S. Rudnev A. A. Vaganov-Vil’kins P. M. Nedozorov T. P. Yarovaya N. M. Chigrinova 《Russian Journal of Applied Chemistry》2012,85(8):1147-1152
For one-stage formation of coatings containing polytetrafluoroethylene or graphite, it was proposed to use Na2SiO3 + NaOH aqueous electrolyte containing siloxane-acrylate emulsion and dispersed powders of polytetrafluoroethylene or graphite. The phase and elemental composition and surface morphology of the formed coatings were determined. It was shown that the introduction of polytetrafluoroethylene markedly increases the hydrophobic and wear-resistant properties of coatings. 相似文献
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The electrosurface characteristics (total surface charge, electrokinetic potential, and positions of the point of zero charge and isoelectric point) of zinc oxide have been comprehensively studied as depending on pH and background electrolyte (NaCl) concentration. The constants of surface reactions and the adsorption potentials of potential determining of background electrolyte ions have been obtained in terms of the 2pK-model. The aggregation stability of aqueous zinc oxide suspensions has been studied in a wide range of concentrations of 1: 1 and 1: 2 electrolytes, and the threshold of sol coagulation has been found. Within the framework of the DLVO theory, the interaction energy between ZnO particles has been calculated as a function of the interparticle distance. It has been demonstrated that the experimental data can be qualitatively described in terms of the classical DLVO theory, which takes into account only ion-electrostatic and molecular (dispersion) forces of interparticle interaction. 相似文献
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N. I. Ponomareva T. D. Poprygina V. M. Kashkarov M. V. Lesovoi 《Russian Journal of Inorganic Chemistry》2011,56(11):1713-1716
A new method was used to deposit coatings containing calcium carbonate and calcium phosphates onto titanium. The presence
of calcite and hydroxyapatite crystals in specimens as the major phases was proved by X-ray diffraction analysis, IR spectroscopy,
elemental analysis, and electron microscopy. The inorganic coatings were revealed to have good adhesion to titanium and be
stable in aqueous solutions. 相似文献
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L. M. Tyrina V. S. Rudnev P. M. Nedozorov A. Yu. Ustiniov I. V. Lukiyanchuk T. A. Kaidalova 《Russian Journal of Inorganic Chemistry》2011,56(9):1429-1435
Catalytically active Pt-containing oxide composites on aluminum have been prepared by plasma electrolytic oxidation (PEO)
and by additional modification of the resulting coating by impregnation with an aqueous solution of chloroplatinic acid followed
by calcination. The oxide film/metal composites have been characterized by X-ray diffraction, X-ray photoelectron spectroscopy,
and electron microscopy. The modified films contain the γ-Al2O3 and Pt crystalline phases. Platinum in the surface and subsurface layers is in the Pt0 state. There are platinum-rich areas on the surface of the PEO films. A higher catalytic activity in CO oxidation into CO2 is shown by the samples whose oxide film contains nickel and copper along with platinum. 相似文献
15.
V. S. Rudnev V. P. Morozova I. V. Lukiyanchuk M. V. Adigamova I. A. Tkachenko A. Yu. Ustinov P. V. Kharitonskii A. M. Frolov 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2013,87(6):1052-1056
(Fe+Co)-containing oxide coatings are formed on aluminum alloy. It is established that at a temperature of ~2 K, the coatings manifest ferromagnetic properties. The coatings, formed within 5 min, are characterized by an anomalously high coercive force H c = 1300 Oe. At room temperature (300 K), they manifest ferromagnetic properties, whereas in external fields of ~30 kOe they tend to transition into the antiferromagnetic state. It is concluded that magnetism is in this case due to the presence in the coating’s pores of crystallites ~50–100 nm in size that consist predominantly of reduced iron, cobalt, and aluminum. 相似文献
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Harju M Halme J Järn M Rosenholm JB Mäntylä T 《Journal of colloid and interface science》2007,313(1):194-201
The influence of aging in mild aqueous conditions (pH 4, 7 and 9) on surface properties of plasma sprayed oxide was studied using electrophoretic mobility studies and measuring concentrations of dissolved species from exposure liquids. In addition, required acid/base additions to maintain constant pH, redox potentials suspension conductivities were measured. The experiment time was two weeks. The plasma sprayed materials were based on Al(2)O(3), TiO(2) and Cr(2)O(3). Materials based on Al(2)O(3) dissolved easily at pH 4 due to presence of metastable gamma-Al(2)O(3) phase. In addition there was clear change in surface charging properties (zeta potential) of Al(2)O(3) surfaces so that the estimated IEP value drifted from >9 at the beginning of aging and dropped down to 8.5-8.7 after 2 weeks of treatment. Plasma sprayed TiO(2) did not dissolve under the experiment conditions. Even thought the surface charging (zeta potential) changed during the exposure, the estimated IEP remained close to the values reported for pure TiO(2) materials. Plasma sprayed Cr(2)O(3) based materials were also insoluble at the studied pH values. On the other hand, the estimated IEP values deviated radically from the reported PZC values of similar materials. 相似文献
17.
Journal of Solid State Electrochemistry - This paper discusses the electrolyte distribution over the surface of a 4.5 V LiCoO2 electrode via linear sweep voltammetry using the Pt probe of... 相似文献
18.
O. V. Komova L. T. Tsykoza A. V. Simakov A. V. Ushakov V. A. Bolshov G. B. Barannik Z. R. Asmagilov 《Reaction Kinetics and Catalysis Letters》1994,52(1):129-137
Physico-chemical properties of Cu–Ti oxide catalysts have been studied. The effect of parent titanium dioxide properties (specific surface, preparation procedures) on the state of Cu ions on the anatase surfaces has been revealed. 相似文献
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Rutile-type dioxides of titanium and ruthenium form partial solid solutions at temperatures above 1000°C, whereas the miscibility is complete in the temperature range of 350–600°C, when the oxides are coated on titanium or alumina substrates. The present work tends to show that the RuxTit?xO2 coatings are metastable solutions wherein the chloride ions are likely to replace the oxide ions on the sublattice O2? sites. The increase of a and c parameters in the overall composition range are compatible with a Cl/Ru ratio of 2.5 at.% in the rutile lattice. This ratio does not depend upon the titanium content and therefore it is thought that the Cl? ions are compensated by reduced Ru3+ (or Ti3+) species. The electrical conductivity retains its metal-like characteristics in the composition range of 30–100% RuO2, this is accounted for by the existence of RuO π1 bands along (110) directions. The reduced ions in equilibrium with Cl? would provide additional paths for electron transport along the c-axis, explaining the high values of conductivity in the concentration range of 30–50% RuO2. 相似文献
20.
V. D. Parkhomenko A. S. Katashynsky P. N. Tsybulev N. V. Parkhomenko 《Reaction Kinetics and Catalysis Letters》1997,62(2):359-362
The mechanism of NO activation on the surfaces of crystalline titanium monocarbide and titanium mononitride has been studied
within the framework of semiempirical SCF LCAO NDDO method. The adsorption has been shown to be accompanied by electron density
transfer from the crystal surface to the adsorbate molecule. Stronger activation of the NO molecule is observed on the TiC
surface as compared with that on TiN surface. 相似文献