Immobilization of Functionalized Molecules and Nanoparticles in Organic 2D Networks as a Method for the Preparation of Stable Supramolecular Devices

V. V. Arslanov, L. S. Sheinina, and M. A. Kalinina

Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

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Received May 20, 2007

Abstract — A novel trend in planar supramolecular chemistry is discussed. The trend relates to development of new methods for the formation of organic 2D networks on the surface of a liquid or a solid, immobilization of functionalized molecules and nanoparticles in them, and creation of highly stable supramolecular devices basedon such systems.

PACS numbers: 81.16.Fg

Critical Potential of the Surface Development of AgAu Alloys

A. V. Vvedenskii, O. V. Koroleva, and O. A. Kozaderov

Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia

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Received August 8, 2006

Abstract—Based on the model taking into account the appearance of a morphological instability and the evolution of a surface with time during the selective anodic dissolution of a homogeneous A–B alloy with the predominant content of the electrochemically negative metal A, equations for the critical potential E_cr and over potential _cr of the surface development are derived. Criteria of the nature of chemical hindrances of the selective dissolution in the over-critical range are formulated. The E_cr and _cr values corresponding to the breakage of the morphological stability of the A–B alloy surface (with the atomic silver part X_Ag = 0.65 to 0.95) in an acidicnitrate solution containing diverse amounts of silver ions (10⁴ to 10² M) are experimentally found. The character of the effect of the atomic gold content in the alloy and the concentration of silver ions in the solution on_cr and E_cr values of the alloys is determined. The nature of the kinetic limitations of the selective dissolution in the over-critical potential range is clarified.

PACS numbers: 82.45.Q

The Effect of Anions on the Anodic Dissolution of Nickel Silicide in Sulfate Electrolytes

A. B. Shein, O. S. Ivanova, R. N. Minkh

Perm State University, ul Bukireva 15, GSP, Perm, 614990 Russia

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Received July 24, 2006

Abstract — Anodic dissolution of nickel and nickel silicide in a 0.5 M H₂SO₄ solution in the presence of halide and thiocyanate ions is studied with the use of cyclic voltammetry. Main regularities of the effect of anions on the mechanism and kinetics of the anodic dissolution of the metal and its silicide are found. The results obtained reveal different nature of the passivation processes and different compositions of the oxide films formed on Ni and NiSi.

PACS numbers: 81.65.Kn; 81.65.Rv; 82.45.Bb

Study of Electrochemical Lithium Incorporation to Whisker Structure Based on BariumVanadium Bronze BaV₈O₂₁

T. L. Kulova^a, A. M. Skundin^a, S. B. Balakhonov^b, D. A. Semenenko^b, E. A. Pomerantseva^b,
A. G. Veresov^b, E. A. Goodilin^b, B. R. Churagulov^b, and Yu. D. Tret’yakov^b

^a Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

^b Moscow State University, Vorob’evy Gory, Moscow, 119899 Russia

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Received May 28, 2007

Abstract — Both nanobands and macroscopic (up to 3mm-long) filamentous conducting BaV₈O₂₁ crystals are prepared for the first time by hydrothermal processing of polymerized gels. They show stable electrochemical characteristics acceptable for their usage in newly elaborated secondary cells (batteries).

PACS numbers: 81.16.–c; 82.45.Wx

Codeposition of Iron and Nickel onto Aluminum during Contact Exchange and the Properties of the Resulting Deposits

A. F. Dresvyannikov and M. E. Kolpakov

Kazan State Technological University, ul. Karla Marksa 68, Kazan, 420015 Tatarstan, Russia

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Received November 25, 2006

Abstract — Joint reduction of iron(III) and nickel(II) ions on aluminum in aqueous solutions was studied by electrochemical and kinetic methods. The structures and physicochemical properties of the deposits obtained by contact exchange were assessed.

PACS numbers: 82.45.Bb

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Passivation and Local Activation of -Fe + Fe₃C-based Nanocomposites in Neutral Media

A. V. Syugaev¹, S. F. Lomaeva¹, and S. M. Reshetnikov²

¹ Physicotechnical Institute, Ural Division, Russian Academy of Sciences, ul. Kirova 132, Izhevsk, 426000 Russia

² Udmurt State University, ul. Universitetskaya 1, Izhevsk, 426034 Russia

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Received June 06, 2007

Abstract — Regularities of the anodic dissolution and processes of local activation of -Fe + Fe₃C nanocomposites containing 9 to 92 mol % of cementite are studied. It is shown that the sequence of anodic processes in borate solutions is the same for pH 6.3 and 7.4, namely, the dissolution and passivation of the ferrite component, dissolution and passivation of the cementite component, and anodic oxygen evolution at the nanocomposites' passive surface. With an increase in the pH the passivation potentials decrease, which agrees with a thermodynamic model of the formation of two-layer passive film Fe₃O₄/-Fe₂O₃. It is found that the chloride concentration range, in which the local activation of -Fe + Fe₃C is possible, narrows with an increase in the cementite content.

PACS numbers: 81.07.Bc, 82.45.Bb

Composition and Structure of CobaltMolybdenumBoron Alloys Produced by Chemical Catalytic Reduction with Dimethylamine Borane

A. B. Drovosekov, M. V. Ivanov, V. M. Krutskikh, E. N. Lubnin, and Yu. M. Polukarov

Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

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Received June 26, 2007

Abstract — The co-reduction of cobalt and molybdate ions with dimethylamine borane in pyrophosphate solutions is shown to produce Co–Mo–B alloy coatings. Molybdate is reduced concurrently with cobalt to metal forming a solid solution in cobalt matrix with a hexagonal lattice. The alloy deposits have a pronounced [001] texture with the easy magnetization direction normal to the coating surface. The composition of alloys is het-erogeneous in their thickness. The alloys contain cobalt and molybdenum hydroxide admixtures, as well as intermediate products of molybdenum reduction, in the superficial layers.

PACS numbers: 75.70.-i; 81.15.-z

Oxide Zirconium Containing Films on Titanium

V. S. Rudnev, K. N. Kilin, T. P. Yarovaya, and P. M. Nedozorov

Institute of Chemistry, Far East Division, Russian Academy of Sciences,
pr. Stoletiya Vladivostoka 159, Vladivostok, 690022 Russia

Received

Abstract — Oxide films 5–8-m thick are obtained on titanium in aqueous Zr(SO₄)₂ bath by the plasma-electrolytic method. Depending on the electrolyte pH, the film contain either zirconium and titanium with ZrO₂ + TiO₂ phases or titanium and TiO₂. The resulting dense films with limited water wettability are of interest as potential protective coatings.

PACS numbers: 81.15.–z; 81.65.Kn

Morphology, Structure, and Phase Composition of Microplasma Coatings Formed on AlCuMg Alloy

A. I. Slonova and O. P. Terleeva

Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences,
pl. akademika Lavrent’eva 3, Novosibirsk, 630090 Russia

Received March 31, 2006

Abstract — Results of studies that relate the stages of coating formation with the properties of the coatings, formed on an aluminum alloy of the Al–Cu–Mg system from silicate alkaline baths by asymmetric ac current, are presented. The specific features are elucidated and the sequence in the formation of layered coatings and their phase composition is shown. The dependences of the limiting thickness of the overall coating, as well as a layer strengthened on the current asymmetry, are found. The coatings are characterized by the nonuniform distribution of microhardness not only along the surface but also throughout the coating thickness, which is caused by the structural heterogeneity and the phase composition, which in turn, are related with the peculiar-ities of the coating formation by asymmetric ac current.

PACS numbers: 81.15.-z; 81.65.Kn

Effect of Complex Formation on the Effectiveness of Benzhydrazides in the Cadmium Electrodeposition from Perchlorate Baths

V. V. Kuznetsov, L. M. Skibina, and R. R. Khalikov

Rostov State University, ul Zorge 7, Rostov-on-Don, 344090 Russia

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Received November 25, 2006

Abstract — It is shown that, depending on the nature of a substituent R in the molecule of addition agent, the electroactive species in the electron transfer may be either 2:1 metal–ligand complexes or more stable 1:1 ones. In the former case, the complexes formed in the surface layer blockade the electrode surface, increase '-potential and thus impede the metal ion discharge; their inhibitive action increases with an increase in the ligand concentration. In the latter case, the complex formation makes the adsorption film be more permeable and thus accelerates the electroreduction reaction. An increase in the addition agent concentration is accompanied with a decrease in its inhibiting effectiveness.

PACS numbers: 81.15.Pq; 81.65.Kn; 82.45.Qr