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11.
Developing the Synthesis of Homogeneously Microporous Carbon Membranes for Selective Extraction and Accumulation of Organic Molecules with a Carbon Unit as a Carrier V. A. Drozdov*, O. N. Baklanova, V. A. Likholobov*, O. A. Chirkova, and T. I. Gulyaeva * Omsk Scientific Center, Siberian Division, Russian Academy of Sciences, Omsk, Russia Institute of Problems of Hydrocarbon Processing, Siberian Division, Russian Academy of Sciences,
ul. Neftezavodskaya 54, Omsk, 644040 Russia E-mail:
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Received June 5, 2008 Abstract — The composite carbon–carbon membranes (CMS membranes) obtained by polymer modification of a mesoporous carbon substrate through the formation of an activated carbon layer have microporous structures (specific micropore volume 0.11  0.05 cm3/g). The size distribution of micropores shows two distinct peaks at 4.5 to 6.5 and 7.0 to 9.0 Å. The micropores with these widths adsorb well CO2 and   4, respectively. PACS numbers: 68.43.-h DOI: 10.1134/S2070205109020117
10/04/2009 | 886 Посещения | Печать
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12.
Technology of Integrated Usage of Fullerene Materials in Sorbent Production M. L. Podvyaznikov, V. V. Samonin, E. A. Spiridonova, and V. Yu. Nikonova St.-Petersburg State University of Technology, Moskovskii pr. 26, St.-Petersburg, 190013 Russia E-mail:
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Received June 5, 2008 Abstract — Information about the main directions of the developing production technology of adsorbing materials, containing bound fullerenes, is given. The most promising is the usage of fullerene microquantities as a modifier of sorbing materials of diverse nature, which substantially increases their activity. PACS numbers: 68.43.-h DOI: 10.1134/S2070205109020129
10/04/2009 | 862 Посещения | Печать
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13.
Adsorption of Formaldehyde at Mineral Nanoporous Sorbents Exposed to a Pulse Magnetic Field L. I. Bel’chinskaya*, N. A. Khodosova*, and L. A. Bityutskaya** * Voronezh State Forestry Engineering Academy, ul. Timiryazeva 8, Voronezh, Russia E-mail:
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** Voronezh State University, Universitetskaya pl. 1, Voronezh, Russia Received June 5, 2008 Abstract — The influence of the preexposure of various nanoporous aluminosilicate sorbents to a pulse magnetic field on the adsorption of the formaldehyde vapor was considered. The effect of the pulse magnetic field on the surface morphology of the sorbents and intensifying the sorption activity was estimated. A magnetic field with B = 0.011 T intensified the adsorption by a montmorillonite sample, while an increase in the magnetic induction from 0.011 to 0.12 T enhanced the adsorption by clinoptilolite-containing samples. A combination of the pulse magnetic field (B = 0.011 T) and thermal treatment intensified the adsorption of formaldehyde at all the sorbents studied. The sorbents exposed to the pulse magnetic field were most active 48 h after the exposure. The relaxation time was 72 h for all the systems studied at different B values. PACS numbers: 68.43.-k DOI: 10.1134/S2070205109020130
10/04/2009 | 822 Посещения | Печать
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14.
Binder Influence on the Structural and Mechanical Properties of Porous Silicate Ceramics A. I. Rat’ko, A. I. Ivanets, E. A. Stepanova, and S. M. Azarov Institute of General and Inorganic Chemistry, National Academy of Sciences of Belarus,
ul. Surganova 9/1, Minsk, 220072 Belarus E-mail:
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Received June 5, 2008 Abstract — The influence of aluminum- and silicon-based binders on the structural and mechanical properties of porous silicate ceramics constructed from powdery structural elements was studied. Data from x-ray powder diffraction analysis, differential thermal analysis, IR spectroscopy, and scanning electron microscopy allowed to propose a structuration mechanism during high-temperature treatment of ceramic samples composed of crystalline silica and an aluminosilicate binder. PACS numbers: 81.05.Je,Mh DOI: 10.1134/S2070205109020142
10/04/2009 | 884 Посещения | Печать
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15.
Influence of the Carbonization Conditions on the Formation of the Porous Structure of Activated Carbon from Cotton Lignin M. G. Ismailova Sultanov Research Institute of Pharmaceutical Chemistry, Uzbekistan E-mail:
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Received June 5, 2008 Abstract — Carbonization (thermal pyrolysis) is the determining step in the formation of the porous structures and other physicochemical properties of activated carbons obtained from cotton lignin. Activation of the samples carbonized at 800  produces carbon sorbents with the optimum parameters. PACS numbers: 68.43.-h DOI: 10.1134/S2070205109020154
10/04/2009 | 1016 Посещения | Печать
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16.
Investigation of Calcareous Deposits Formation on Copper and 316L Stainless Steel under Cathodic Polarization in Artificial Seawater1 M. Sarlak, T. Shahrabi, and M. Zamanzade Department of Materials Science and Engineering, Faculty of Engineering, Tarbiat Modares University,
Nasr bridge, Tehran, Iran e-mail:
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Received July 17, 2007 Abstract — The formation and growth of calcareous deposits on 316L stainless steel and copper under cathodic polarization in artificial seawater were investigated by electrochemical tests and analytical techniques such as SEM, EDX and XRD. The deposits mineral compositions were related to the types of metallic materials and were different on each substrate. On 316L stainless steel at potentials less negative than the water reduction potential (–1100 mV/SCE), the deposits were composed of aragonite with low amounts of brucite; at the potentials more negative than the water reduction potentials, only of brucite. Around the water reduction potentials, the deposits were composed of both aragonite and brucite together. However the formation of brucite was noted before activating the water reduction processes. The results were moderately similar to that on mild steel and the type of deposited phases depended on potentials, at which the cathodic protection was carried out. The deposits formed on copper differed from those on 316L stainless steel and the types of deposited phases were independent from water reduction potential on copper (–1150 mV/SCE). Hence, the deposits were composed only of aragonite at all potential ranges. Due to the low current densities observed in chronoamperometric curves during cathodic polarization and in sufficient alkalinity, it seemed that the brucite could not deposit on this metallic substrate. PACS numbers: 31.65.Kn DOI: 10.1134/S2070205109020166
10/04/2009 | 1111 Посещения | Печать
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17.
Constant Magnetic Field Refinement of Chromium-free Conversion Coatings on AZ31 Magnesium Alloy G. Bikulcius, A. Rucinskiene, E, Sudavicius, and A. Selskis Institute of Chemistry, ul. Goshtauto 9, Vilnius, 01018 Lithuania Received October 02, 2007 Abstract—By the electrochemical protective efficiency of conversion coatings on an AZ31 alloy, it is shown that the corrosion stability of AZ31 alloy depends on the activating solution treated with magnetic field. Scanning electron microscopic studies demonstrate that the surface morphology of conversion coatings is identical irrespective of the magnetic field treatment. The cross-section composition of conversion coatings is deter-mined by x-ray photoelectron spectroscopy (XPS). XPS data demonstrate that a conversion coating treated with magnetic field is thicker than coatings nonsubjected to this treatment. It is also shown that a conversion coating of AZ31 alloy mainly consists of oxides and hydroxides, namely, MgO, Mg(OH)2, MgF2 and  Al2O3, MgAl2O4. However, when magnetic field is applied, the aluminum concentration increases from 0.73 to 6.65 at. %, and the fluorine concentration decreases from 12.06 to 8.11 at. %. PACS numbers: 81.65.Kn DOI: 10.1134/S2070205109020178
10/04/2009 | 971 Посещения | Печать
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18.
Peculiarities of Long-Term Effect of Hydrosulfide-Enriched Seawater on a Copper Alloy I. E. Zanin, V. Yu. Kondrashin, V. N. Latartsev, and V. V. Chernyshev Voronezh State University, Universitetskaya pl. 1, Voronezh, 394006 Russia E-mail:
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Received May 26, 2007 Abstract — Copper specimens (coins) found at the bottom of Taman bay, which lied in water for about 1600years, manifested a very high corrosion resistance. The uniqueness of the phenomenon is attributed to the heightened concentration of hydrogen sulfide caused by the activity of mud volcano in this region. Under the layer of insoluble corrosion products, namely copper sulfides and disulfides, the items preserved the original surface relief. PACS numbers: 82.45.Bb DOI: 10.1134/S207020510902018X
10/04/2009 | 1043 Посещения | Печать
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19.
Electrochemical Behaviour of Zinc in Chloride and Acetate Solutions1 G. Kilin  eker and H. Gal p a Cukurova University, Department of Chemistry, Adana, Turkey b Eastern Mediterranean University, Department of Chemistry, G. Magusa, T.R.N.C. e-mail:
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Received August 14, 2007 Abstract — The corrosion behaviour of zinc in chloride medium was investigated in the absence as well as the presence, of acetate ions. The temperature effect was also investigated by varying the temperature in a range of 298 to 328 K, while the pH was kept constant at 8.5. Polarization resistance (Rp) and activation energy (Ea) values were determined, by means of potentiodynamic and EIS measurements. Thermodynamic properties were evaluated with the current-potential measurements. The temperature, ionic species and the parts of oxide film on anodic and cathodic processes are discussed. It was shown that zinc acetate [Zn(CH3COO)2] formation could provide important protection with other zinc corrosion products, against the attack of corrosive environment. PACS numbers: 82.45.Hk DOI: 10.1134/S2070205109020191
10/04/2009 | 1056 Посещения | Печать
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