Индекс цитирования

Авторизация






Lost Password?

Cover of magazine

News

(11/10) Ученые из ИФХЭ РАН и МГУ под руководством Ольги Виноградовой поняли, как «полосатая» гидрофобность..
Sorry this content is not available in your selected language....
Read More ...
(11/10) Ученые обнаружили пути проникновения вирусов гриппа и ВИЧ в организм
Sorry this content is not available in your selected language....
Read More ...
(17/04) Курс “Анализ геномных данных”, Москва, 2 – 11 июля 2012
Sorry this content is not available in your selected language....
Read More ...
(12/03) Впервые получено изображение атомов, движущихся в молекуле
Sorry this content is not available in your selected language....
Read More ...

 

Results 11 - 20 of 134
11.

Micrograins on the Surface of Anodic Films

V. S. Rudnev, I. V. Lukiyanchuk, and V. G. Kuryavyi

 

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

e-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received July 25, 2007

 

Abstract — Data on the composition and structure of micrograins located on the surface of oxide films formed on aluminum by the plasma-electrochemical (PE) method are shown. The studied micrograins represent polyhedral tubes narrowing towards one end with the characteristic size of about 1 m. They are concentrated on the defective surface sites. Micrograins contain considerably higher amounts of carbon, nickel, copper, and other electrolyte components but lower amounts of aluminum and oxygen compared with the oxide film surface. The formation of micrograins and their deposition on the film followed by their treatment with electric discharges is, apparently, one of the mechanisms of the formation of multiphase and multicomponent anodic oxide layers by the PE method.

 

PACS numbers: 82.45.Cc, 81.07.-b

DOI: 10.1134/S2070205109010110
11/02/2009 | 777 Hits | Print

12.

Electrodeposition Kinetics as well as Structures and Properties of Nanostructured Copper Polymer Coatings Based on N-Methylpyrrolidone

L. M. Skibina*, V. V. Kuznetsov*, A. I. Sokolenko**, I. N. Loskutnikova**, and M. A. Yakusheva*

 

* Department of Electrochemistry, Faculty of Chemistry, Southern Federal University,
ul. Zorge 7, Rostov-on-Don, 344090 Russia

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

** Don State Technical University, Russia

Received April 26, 2007

 

Abstract — Applying a cooper galvanic coatings from a heatly with minor (frame02 = 0.03) addition of Nframe1methylpyrrolidone makes the latter much more permeable and capable of displaying the inhibition of the base metal. The former effect is dominant at the monomer concentrations 10frame25 < frame3 < 10frame42 mol/l, while the latter effect is dominant at frame5 > 10frame62 mol/l. The best electroplates in appearance and adhesion were obtained for the metal–additive ratio 1 : 10. According to AFM data, the grain size in this coating is comparable with nanoparticles. Friction tests showed that such copper polymer coatings can be used as a long-lived grease under dry friction conditions.

 

PACS numbers: 82.45.Qr, 82.45.Gz

DOI: 10.1134/S2070205109010122
11/02/2009 | 786 Hits | Print

13.

Electrochemical Properties of Iron Silicocarbide and Cementite in Acidic and Neutral Environments

A. V. Syugaev,* S. F. Lomaeva,* A. N. Maratkanova,* D. V. Surnin,* and S. M. Reshetnikov**

 

* Physical-Technical Institute, Ural Branch, Russian Academy of Sciences,
ul. Kirova 132, Izhevsk, 426000 Udmurtia, Russia

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

** Udmurt State University, ul. Universitetskaya 1, Izhevsk, 426034 Udmurtia, Russia

Received May 5, 2008

 

Abstract — Voluminous specimens of individual Fe5SiC iron silicocarbide and Fe3C iron carbide phases were produced by mechanical alloying with subsequent pressing and considered as models of nonmetallic inclusions in carbon steels and siliceous cast irons. In an acidic sulfate solution, silicocarbide is highly active in hydrogen reduction and iron ionization in the active dissolution range. Therefore, the corrosion resistance of silicocarbide in acids is lower compared to iron and cementite, which is caused by the peculiarities of its crystal structure. In a neutral borate solution both on silicocarbide and cementite, two anodic peaks are observed that are caused by the dissolution of the corresponding phase and the additional oxidation of the passive film, which is characterized by the heightened defectiveness because of the carbon accumulation. Silicocarbide has lower dissolution currents compared to cementite and a higher resistance to the local activation and depassivation, which is caused by the presence of a superficial layer enriched in SiO2.

 

PACS numbers: 81.07.Bc, 82.45.Bb

DOI: 10.1134/S2070205109010134
11/02/2009 | 870 Hits | Print

14.

Interactions of Silicone Rubbers Designed for Electrical Engineering Applications with Aqueous Media

L. B. Boinovich, A. M. Emel’yanenko, and A. S. Pashinin

 

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

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received March 11, 2008

 

Abstract — Interactions of a number of electrical engineering silicone rubbers with water and aqueous salt, weakly acidic, and weakly basic solutions were studied by measuring contact angles. A mechanism for leakage currents along the surfaces of silicone insulators was proposed.

 

PACS numbers: 81.40.Cd, 68.08.Bc

DOI: 10.1134/S2070205109010146
11/02/2009 | 845 Hits | Print

15.

Contact Corrosion of Metals in Aqueous and Organic-Aqueous Environments. II. Concentrated Glycolframe0Water Solutions

V. N. Esenin and L. I. Denisovich

 

A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences,
ul. Vavilova 28, Moscow, 119991 Russia

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received November 2, 2006

 

Abstract — Corrosion behavior of individual aluminum, steel, and cast iron, as well as aluminum–steel, aluminum–cast iron, steel–cast iron, and aluminum–steel–cast iron contact systems, in ethylene glycol solutions containing 5 or 30 vol % fresh water is studied. By contrast to water, these solutions are shown to be inert with respect to steel, while aluminum anodically dissolves in them. Cast iron is least stable, though its dissolution rate in the solutions is still substantially lower than in water.

 

PACS numbers: 82.45.Bb, 81.65.Kn

DOI: 10.1134/S2070205109010158
11/02/2009 | 781 Hits | Print

16.

Corrosion and Anodic Dissolution of Magnesium Alloys in the Presence of Inhibitor

A. N. Kozlova,* T. N. Ostanina,* V. M. Rudoi,* E. N. Umrilova,* and V. B. Malkov**

 

* Ural State Technical University–UPI, pr. Mira 19, Ekaterinburg, 620002 Russia

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

** Institute of High-Temperature Electrochemistry, Ural Division, Russian Academy of Sciences,
ul. S. Kovalevskoi 22, Ekaterinburg, 620219 Russia

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received June 17, 2007

 

Abstract — The effect of NTPS inhibitor on the corrosion behavior of magnesium alloys with various contents of alloying components is studied. NTPS is found to be an effective corrosion inhibitor in the absence of energizing, but under the anodic polarization, it does not produce any noticeable effect on the self-dissolution process. Comparative analysis of the processes proceeding at the anodic dissolution of magnesium and electronmicroscopic studies of the specimens showed that the dissolution is accelerated due to the active-surface development. A supposition that, under the effect of a constant anodic current, the development and formation of the magnesium surface relief takes place at the initial polarization stage is put forward.

 

PACS numbers: 82.45. Bb

DOI: 10.1134/S207020510901016X
11/02/2009 | 786 Hits | Print

17.

Methods for Analysis of the AFM Images of Thin Films of Block Copolymers

E. A. Men’shikov**, A. V. Bol’shakova**, O. I. Vinogradova*, and I. V. Yaminsky**

 

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

** Faculty of Physics, Moscow State University, Moscow, 119992 Russia

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received March 6, 2008

 

Abstract — The structures of thin films of the polystyrene–polymethacrylate–polystyrene (SMAS) triblock copolymer were studied. A versatile algorithm for analysis of the AFM images of thin block-copolymer films was developed.

 

PACS numbers: 87.64. Dz

DOI: 10.1134/S2070205109010171
11/02/2009 | 811 Hits | Print

18.

Diffusion Kinetics of a Metal Anodic Dissolution with Forming Unstable Charged Products

A. V. Noskov and S. A. Lilin

 

Institute of Solution Chemistry, Russian Academy of Sciences,
ul. Akademicheskaya 1, Ivanovo, 153000 Russia

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received August 27, 2007

 

Abstract — Anodic dissolution of bivalent metal in binary electrolyte, through positively charged intermediates, is theoretically analyzed. The components’ concentrations and the electrical potential distributions in dif-fusion layer under the intermediate quasireversible decomposition are calculated. It is shown that the electrochemical process rate decreases when the products’ stability constant increases.

 

PACS numbers: 82.45. Qr

DOI: 10.1134/S2070205109010183
11/02/2009 | 791 Hits | Print

19.

Electrodynamics Applied To Electrode Potential and Electrochemical Kinetics

R. R. Salem

 

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received March 28, 2007

Abstract — A key idea of the possibility of describing electrochemical systems and processes in terms of Maxwell’s electromagnetic theory is presented. This is an alternative to conventional Nernst–Tafel concept based on the Arrhenius hypothesis about electrolytic dissociation, which, despite of its minor heuristic value, is adhered to in many branches of chemistry for more than a century, thus, decelerating the progress. Fundamental laws of thermodynamics and electromagnetism enable us to use sufficiently elementary mathematical tools when quantitatively describing and predicting not only equilibrium states, but also transient processes with no use of model concepts.

 

PACS numbers: 73.30.+y

DOI: 10.1134/S2070205109010195
11/02/2009 | 820 Hits | Print

20.

Nanoporous Materials and Their Adsorption Properties

A. A. Fomkin

 

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

E-mail: This e-mail address is being protected from spam bots, you need JavaScript enabled to view it

Received June 5, 2008

 

Abstract—Principal regularities of forming microporous adsorbents with different surface composition, in particular, active coals, zeolites, silica gels, alumina gels, fullerenes, and carbon nanotubes are considered. The data on the structure-energetecal characteristics of the adsorbents and systems are correlated. Principal characteristic features of the microporous adsorbents deformation during frame0frame12, frame2frame34, Ar, N2, and Xe adsorption in a 177.65–393 K temperature range at the pressures of up to 7.0 MPa are studied by example of the AUK microporous carbonaceous adsorbent and the NaX zeolite. An analysis of the adsorption deformation of the microporous adsorbents as a function of the adsorption amount, temperature, and physicochemical properties of adsorbed gas is presented. Based on the analysis of benzene adsorption isotherms for the C60 and C70 fullerenes, a suggestion is advanced on the formation of fullerene–benzene adsorption complexes comprising on average three fullerene and two benzene molecules; their characteristic energy comes to frame4frame5 ~ 25 kJ/mol. It is shown, by using the adsorption and SEM data that the cuminol adsorption at the nanotubes yields supramolecular complexes in which the cumene molecules act as coordinating ones. By using the micropore bulk filling theory, the hydrogen adsorption is calculated for model supramolecular systems in which the carbon nanotubes are bundled up, with leaving gaps between the bundles.

PACS numbers: 68.43-h

DOI: 10.1134/S2070205109020014
10/04/2009 | 1053 Hits | Print

  

Powered by AlphaContent 3.0.4 © 2005-2022 - All rights reserved