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(17/04) Курс “Анализ геномных данных”, Москва, 2 – 11 июля 2012
Уважаемые коллеги, Со 2 по 11 июля 2012 года Учебный центр Института биологии гена РАН организует практический десятидневный курс по статистическому анализу геномных дан...
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(12/03) Впервые получено изображение атомов, движущихся в молекуле
Исследователи из Университетов Огайо и Канзаса впервые смогли получить изображения атомов, движущихся в молекуле. С помощью ультрабыстрого лазера исследователи выбивали элек...
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(12/03) Наблюдение за распределением зарядов в молекуле
Исследователи из Швейцарии впервые с помощью экспериментов смогли визуализировать распределение зарядов отдельной молекуле. Предполагается, что результаты работы могут при...
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(22/01) Простой способ разделения углеродных нанотрубок
Существуют одностенные углеродные нанотрубки [single-walled carbon nanotubes (SWCNT)] с металлическим и полупроводниковым типом проводимости, однако для использования этих...
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Результаты 1 - 10 из 10
1.

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

DOI: 10.1134/S0033173208010013
03/09/2008 | 830 Посещения | Печать

2.

Critical Potential of the Surface Development of Agframe0Au 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 Ecr 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 Ecr and cr values corresponding to the breakage of the morphological stability of the A–B alloy surface (with the atomic silver part XAg = 0.65 to 0.95) in an acidicnitrate solution containing diverse amounts of silver ions (10frame14 to 10frame22 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 oncr and Ecr 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

DOI: 10.1134/S0033173208010025
03/09/2008 | 772 Посещения | Печать

3.

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

DOI: 10.1134/S0033173208010037
03/09/2008 | 922 Посещения | Печать

4.

Study of Electrochemical Lithium Incorporation to Whisker Structure Based on Bariumframe0Vanadium Bronze BaV8O21 frame1 frame2

T. L. Kulovaa, A. M. Skundina, S. B. Balakhonovb, D. A. Semenenkob, E. A. Pomerantsevab,
A. G. Veresov
b, E. A. Goodilinb, B. R. Churagulovb, and Yu. D. Tret’yakovb

 

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 frame3 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

DOI: 10.1134/S0033173208010049
03/09/2008 | 885 Посещения | Печать

5.

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

DOI: 10.1134/S0033173208010050

 


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03/09/2008 | 829 Посещения | Печать

6.

Passivation and Local Activation of frame0-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

DOI: 10.1134/S0033173208010062
03/09/2008 | 839 Посещения | Печать

7.

Composition and Structure of Cobaltframe0Molybdenumframe1Boron 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

DOI: 10.1134/S0033173208010074
03/09/2008 | 782 Посещения | Печать

8.

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

DOI: 10.1134/S0033173208010086
03/09/2008 | 851 Посещения | Печать

9.

Morphology, Structure, and Phase Composition of Microplasma Coatings Formed on Alframe0Cuframe1Mg 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

DOI: 10.1134/S0033173208010098
03/09/2008 | 841 Посещения | Печать

10.

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

DOI: 10.1134/S0033173208010104
03/09/2008 | 816 Посещения | Печать

  

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