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(11/10) Ученые из ИФХЭ РАН и МГУ под руководством Ольги Виноградовой поняли, как «полосатая» гидрофобность..
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(17/04) Курс “Анализ геномных данных”, Москва, 2 – 11 июля 2012
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(12/03) Впервые получено изображение атомов, движущихся в молекуле
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Results 91 - 100 of 134
91.

Drying of Liquidized Products of Pyrolysis on Composite Sorbent CaCl2/Al2O3: Statics, Dynamics, and Modeling

E. A. Buluchevskii, A. V. Lavrenov, and V. K. Duplyakin

Institute of the Contemporary State of Hydrocarbon Processing, Siberian Branch, Russian Academy of Sciences

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Received June 5, 2008

 

Abstract — Our investigation on the equilibrium of water sorption by composite sorbent CaCl2/Al2O3 in a model system based on benzene and its use for the dynamic drying of liquidized products of pyrolysis is reported. To describe the dynamics of drying, a mathematical model has been developed that has been used to estimate the operating parameters of an industrial drying plant for liquidized products of pyrolysis.

PACS numbers: 64.43.-h

 

DOI: 10.1134/S2070205109050190
21/10/2009 | 527 Hits | Print

92.

Prediction of Time to Failure in Stress Corrosion Cracking of 304 Stainless Steel in Aqueous Chloride Solution by Artificial Neural Network1

S. A. Lajevardia, T. Shahrabia, V. Baigia, and A. Shafiei Mb

 

a Department of Materials Engineering, Tarbiat Modares University, Tehran, Iran

b Department of Materials Science and Engineering, Sharif University of Technology, Tehran, Iran

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Received June 09, 2008

 

Abstract — Despite the numerous researches in Stress Corrosion Cracking (SCC) risk of austenitic stainless steels in aqueous chloride solution, no formulation or reliable method for prediction of time to failure as a result of SCC has yet been defined. In this paper, the capability of artificial neural network for estimation of the time to failure for SCC of 304 stainless steel in aqueous chloride solution together with sensitivity analysis has been expressed. The output results showed that artificial neural network can predict the time to failure for about 74% of the variance of SCC experimental data. Furthermore, the sensitivity analysis also demonstrated the effects of input parameters (Temperature, Applied stress and Cr concentration) on SCC of 304 stainless steel in aqueous chloride solutions.

PACS numbers: 84.35.+i, 61.20.Mk

DOI: 10.1134/S2070205109050207
21/10/2009 | 576 Hits | Print

93.

Formation of Surface Layers upon Evaporation of meso-Tetra(benzo-15-crown-5)porphyrin on Nanostructured Iron Surfaces

V. A. Kotenev, D. N. Tyurin, A. Yu. Tsivadze, A. Yu. Chernyad’ev, N. P. Sokolova,
A. M. Gorbunov, and T. P. Puryaeva

 

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

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Abstract — Morphology and spectral characteristics of the surface structures obtained upon the evaporation of meso-tetra(benzo-15-crown-5)porphyrin on the iron surface are studied with the use of digital optical microsopy, IR Fourier-transform spectroscopy, and x-ray diffraction analysis. During the interaction of porphyrin chloroform solution with nanostructured iron-based metal–oxide nanocomposite template, the process at the original template boundary is shown to initiate the formation of two polymorphous modifications of a porphyrin layer, namely, the aggregated layer and a transparent vitreous layer.

PACS numbers: 81.07,Bc, 42.70.Nq

 

DOI: 10.1134/S2070205109050219
21/10/2009 | 546 Hits | Print

94.

Electrochemical Polymerization of Aniline on Aluminum Electrode from an Oxalic Acid and H2SO4 Solutions1

A. Buyuksagis

 

Afyon Kocatepe University Science and Art Faculty, Afyonkarahisar, TURKEY

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Received January 11, 2008

 

Abstract — In this study, the polymerization of aniline on Al and Pt electrode was examined by cyclic voltammetry There had been reversible reaction on Al electrode. But on the other hand there had been irreversible reaction on Pt electrode. The addition of aniline into the solution led the decrease of current values. The current decreased by adsorption of anodic products on polymer surface. The fact that the anodic peak potential shifted to positive value shows that polyaniline (PANI) catalyzed the formation of polymer. This case shows that the aniline shifted the electrode potential to positive side by the adsorption on the surface. When Al electrode covered with polymer (in 50 mV s–1 potential scanning rate after 20 cycles) was immersed into 1 N HCl solution, the inorganic layer decomposed on the metal surface. This led to decrease the polarization resistance of the metal. SEM microphotographs and EDX fingerprints also confirmed these results.

PACS numbers: 82.45.Bb

 

DOI: 10.1134/S2070205109050220
21/10/2009 | 543 Hits | Print

95.

The Corrosion Characterization of a Ferritic Stainless Steel with Mo Addition in H2SO4 and HCI Acid Solutions

H. Demirorena, M. Aksoyb, T. Yildiza, S. Buytoza

 

a University of Firat, Department of Metallurgy, Faculty of Technical Education, Elazig, Turkey

b University of Firat, Department of Metallurgy and Material Engineering, Faculty of Engineering, Elazig, Turkey

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Received February 1, 2008

 

Abstract — The corrosion behavior of ferritic stainless steel containing 1 wt, % Mo was investigated using an AC impedance technique and the mass loss method. The alloys were produced by casting and forging. They were classified into three groups: unhomogenized, homogenized for 30 minutes and homogenized for 180 minutes. Mass loss tests were carried out on samples homogenized for 180 minutes. The corrosion tests were performed in 0.1 M H2SO4 and 0.3 M HCl acid solutions. SEM investigations were performed on the surface of samples exposed to corrosion for 30 and 360 minutes. The results were compared with results obtained from experiments performed on unalloyed ferritic stainless steel. Molybdenum (Mo) and homogenization heat treatment were found to have a beneficial effect on corrosion behavior of ferritic stainless steel in these solutions.

PACS numbers: 82.45.Bb

 

DOI: 10.1134/S2070205109050232
21/10/2009 | 528 Hits | Print

96.

Corrosion Inhibition of Aluminum 6063 Using Some Pharmaceutical Compounds1

A. S. Foudaa, A. A. Al-Sarawyb, F. Sh. Ahmedc, and H. M. El-Abbasya

 

a Department of Chemistry, Faculty of Science, El-Mansoura University, El-Mansoura-35516, EGYPT

b Department of Chemistry, Faculty of Engineering, El-Mansoura University, El-Mansoura, EGYPT

c Department of Chemistry, Faculty of Science (Demitta), El-Mansoura University, El-Mansoura, EGYPT

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Received April 6, 2009

 

Abstract — The corrosion inhibition characteristics of some pharmaceutical compounds on aluminium 6063 in 0.5 mol l–1 H3PO4 has been studied using weight loss and galvanostatic polarization techniques. Results showed that the inhibition occurs through adsorption of the inhibitor molecules on the metal surface. The inhibition efficiency increased with increasing inhibitor concentration, but decreased with increasing temperature. The adsorption of first group pharmaceutical compounds on the metal surface is found to obey Frumkin’s adsorption isotherm, but the adsorption of second group pharmaceutical compounds is found to obey Temkin’s adsorption isotherm. Thermodynamic parameters for adsorption process were determined. Galvanostatic polarization studies showed that first and second groups' pharmaceutical compounds are mixed-type inhibitors and the results obtained from the two techniques are in good agreement.

PACS numbers: 82.45.Bb

 

DOI: 10.1134/S2070205109050244
21/10/2009 | 622 Hits | Print

97.

Deposition of Diamond-Like Films of Hydrogenized Carbon

V. L. Bukhovets and I. G. Varshavskaya

 

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

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Received February 20, 2009

 

Abstract — Diamond-like films of hydrogenized carbon on metal substrates were produced by deposition from methane activated by capacitive electric discharge (AD) within the frequency range of 5–250 Hz and with a relative pulse duration of the charge of 1.5–17. Variations in the charge parameters (frequency, relative pulse duration, current density, methane pressure, the value of gas flow), substrate temperature, and geometry of the vacuum chamber affect the deposition rate, properties, and structures of films within a wide range. Diamondlike films of hydrogenized carbon represented nanocomposite material. The size of sp2 clusters was 5–6 nm, whereas the sp3/sp2 ratio of carbon and the content of bound hydrogen decreased with increasing substrate temperature and current density and decreasing methane pressure.

PACS numbers: 81.05.Uw

 

DOI: 10.1134/S207020510906001X
07/12/2009 | 815 Hits | Print

98.

Physical and Chemical Processes in Gas-Discharge Plasma During the Deposition of Nanocarbon Films

R. R. Ismagilov, A. P. Volkov, P. V. Shvets, and A. N. Obraztsov

 

Department of Physics, Moscow State University, Moscow, 119991 Russia

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Received March 13, 2003

 

Abstract — The relationship of the parameters of activated methane–hydrogen mixture with the phase composition and structural features was determined for carbon films, which were precipitated from this mixture. Optical emission spectra of dc discharge were studied in conditions of the growth of different nanocarbon films. The peculiarities of the space intensity distribution of radiation corresponding to carbon frame02 dimers are shown.

PACS numbers: 81.05.Uw

 

DOI: 10.1134/S2070205109060021
07/12/2009 | 857 Hits | Print

99.

Comparative Analysis of Film Formation in Glowframe0Discharge Plasma in Mixtures of Methane with Neon and Argon

I. V. Soldatovaa and V. A. Kotenevb

 

a Moscow State Industrial University, Russia

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

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Received May 22, 2009

 

Abstract — Concentrations of Ne, Ar, and H atoms in metastable and resonance states, concentrations of atomic hydrogen, and the growth rates of polymer films were determined in the dc glow discharge in the Ne and Ar mixtures with (1–5) % frame1frame24 in the pressure range of 13–520 Pa and discharge currents of 5–100 mA. The method of ellipsometry was used to control the refraction index and thickness and the composition of polymer films was analyzed with the help of the IR spectroscopy method. Mathematical simulation of discharges under the given conditions was performed. The calculation results were compared to the experimental data. It is shown that the mechanism of the ionization and dissociation processes in discharges with mixtures containing Ne differ considerably from the mechanism of these processes in discharges in mixtures with Ar, which significantly affects the film formation processes. Prolonged tests under ambient conditions showed the high stability of most of the films grown under the discharge in the mixtures of Ar and frame3frame44 (the film refraction index in the case of conditioning up to 10 years decreased by about 0.1 within the measurement error) and in mixtures of Ne with CH4 (the film refraction index under prolonged conditioning features remains almost unchanged).

PACS numbers: 82.77.Dg

DOI: 10.1134/S2070205109060033
07/12/2009 | 809 Hits | Print

100.

Kinetics of Phase Transformations in the Surface Layer of a Binary Alloy at the Selective Dissolution: III. Cuframe0Au | Cu2+ System

 

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

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

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Received November 27, 2008

 

Abstract — Conditions of the phase transformation of gold on the surface of Cu–Au alloys selectively dissolved in an acidic sulfate solution at the overcritical anodic polarization are experimentally found. Kinetic regularities of the formation of an individual Au0 gold phase on the alloy surface depending on the alloy composition, anodic potential, and the presence of organic surfactants in the solutions are determined.

PACS numbers: 82.45.Qr

DOI: 10.1134/S2070205109060045
07/12/2009 | 878 Hits | Print

  

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