(Vestsi Akademii Navuk Belarusi)
SERIES OF CHEMICAL SCIENCES
Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus
| Proceedings of the Academy of Sciences of Belarus (Vestsi Akademii Navuk Belarusi) SERIES OF CHEMICAL SCIENCES Published by The Belaruskaya Navuka Publishing House, Minsk, Republic of Belarus |
Summary: Preparation technique for cadmium telluride nanoclusters in an aqueous solution has been developed. Four samples of CdTe nanoclusters differed in the electronic transition in absorption spectra have been prepared using 2-mercaptoethanol and 1-thioglycerol as stabilising agents and separated from reaction solution using post-preparative size-selective precipitation. Pronounced electronic transitions in the absorption spectra shifted towards higher energies in comparison With bulk CdTe indicate strong quantum confinement in nanosized CdTe particles.
Summary: The effect of quaternary ammonium compound (QAC) structure and polar organic solvent nature on extraction of ion associates of QAC with fluoresceine halogen derivatives by chloroform has been studied.
Kulikov V.I., Kovalchuk A.A., Vinarsky V.A., Yurchenko R.A.
Analysis of complex mixed solvents by gas liquid
chromatography technique using columns of different polarity. pp. 16--22
Summary: Express analysis technique has been developed for complex mixed solvents under isothermal conditions using liquid phases with different polarity: apieson-L and polyethyleneglycol-1500. Optimal conditions for component separation have been determined, different variants of solvent analysis (with known and unknown composition) have been suggested.
Summary: Vapour phase growth of transparent coatings of Sn dioxide on the glass have been investigated. Electrophysical properties of Sn dioxide films and these doped with chlorine and gallium have been measured and their correlation with temperature of coating deposition have been obtained.
Senkov G.M., Nikitina A.M., Gorbatsevich M.F., Filanchuk L.P.
Coke formation on alumoplatinum catalyst modified by chromium and dysprosium. pp. 27--31
Summary: Modification of the alumoplatinum reforming catalyst with Cr and Dy leads to a decrease of coke deposition. Metallic and acidic surface centres modified by Cr and Dy protect the catalysts from coking.
Ratko A.I., Shashkova I.L., Vecher V.A., Gorbatsevich N.V.
Adsorption of Pb(II) by carbonate containing natural sorbents. pp. 32--37
Summary: Adsorption of Pb(II) from water solution by natural carbonate containing sorbents ("carbonate tripoly") has been studied. Natural tripoly has been shown to be an effective Pb(II) sorbent, adsorption being up to 10 mg-eq of Pb(II) per gram of the sorbent. The sorption observed takes place due to several tripoly components. A role of calcium carbonate in Pb2+ ions sorption from aqueous solution has been shown.
Stepanova L.I., Purovskaya O.G., Azarko V.N., Sviridov V.V.
Peculiarities of Ni--Mo alloys electrodeposition from citrate electrolytes. pp. 38--43
Summary: Conditions of Ni--Mo alloys electroplating from citrate - ammonium solutions as well as their composition have been investigated. The alloys with high molybdenum content (up to 42 -- 43 wt.%) have been shown to plate at cathodic current of 10 A/dm2 pH = 9.5, T = 45 °C, concentration of Na2MoO4 in solution being by 1.5 -- 3 times lower than that of NiSO4. Ammonium ions with concentration of more than 0.2 -- 0.3 mol/l has been established to completely suppress nickel deposition. Solid solution formation of molybdenum in nickel has been shown and discussed. Data on micro hardness and corrosion stability of Ni--Mo alloys of different composition are presented.
Khalil V.B., Tkachev S.M., Abaev G.N.
Equilibrium and kinetics of adsorption of C10--C20 paraffins and ammonium on ceolytes CaA. pp. 44--47
Summary: Mathematical modelling of liquid paraffin preparation by adsorption technique "Parex" is necessary to optimise a work of adsorption block and to decrease energy consumption of the process. Regression equations describing equilibrium and kinetics of adsorption of C10--C20 paraffin hydrocarbons and ammonium on ceolyte CaA as well as regression coefficients have been obtained using literature and experimental data. These equations may form a base for "Parex" mathematical modelling.
Talapin D.V., Kulak A.I., Golubev A.N.
Noise signal effect on electrochemical behaviour of electrode system under conditions of kinetic control. pp. 48--52
Summary: The transformation of electric noise signal in the electrochemical systems operating under conditions of charge transfer control and the evolution of the signal-to noise ratio have been studied.
Shevchenko G.P., Potapenko L.T., Sviridov V.V.
Preparation of nanostructured films of germanium (IV) oxide. pp. 53--57
Summary: The procedure has been developed of producing finely dispersed GeO2•H2O peptizable in acid and alkaline media to yield stable sols. The sols provide a formation of continuous uniform nanostructured GeO2 films. The usage of sol-gel technique makes it possible to produce GeO2 films with a controlled particle size.
Supichenko G.N., Butovskaya G.V., Agabekov V.E., Zvereva T.D., Churkina L.A.
Initiative ability of carborane containing peroxides in liquid phase. pp. 58--61
Summary: Rate constants of free radical formation during thermal decomposition of carborane containing peroxides: (m-HCB10H10C-C(O)-O-)2 and m-HCB10H10C-C(O)-O-OC(CH3)3 have been determined using a model reaction of n-decane oxidation (393--413 K). At 393 K their values are by 3 and 18 times lower, respectively, than these for their benzoyl substituted analogues: benzoyl peroxide and t-butylperbenzoate.
Komarov V.S., Repina N.S., Luneva N.K., Oputina A.G., Kosobutskaya N.F.
Ion-exchanging properties of zirconium phosphate grown up on colloid particles. pp. 62--66
Summary: Adsorption-structural and ion-exchanging properties of zirconium phosphate grown up on colloid particles of Al(OH)3 have been studied. The grown up samples have been shown to be superior to an individual zirconium phosphate in structural and exchanging characteristics. In this case the ion exchange value is in a good correlation with a specific surface value of ion exchanger. Advantages of the grown up exchanging materials as compared to massive samples of zirconium phosphate have been noted.
Matveiko N.P., Novikov G.I.
Modification of bisilicide electrode materials by carbon. 1. Cathodic hydrogen evolution. pp. 67--74
Summary: The results of study of cathodic hydrogen evolution on electrodes made from bisilicides of d-elements of 4 to 7 group of the Periodic System modified by different quantity of carbon art presented. The main kinetic parameters of the process have been determined.
Matveiko N.P., Novikov G.I.
Modification of bisilicide electrode materials by carbon. 2. Anodic chlorine evolution. pp. 74--78
Summary: The results of study of cathodic hydrogen evolution on electrodes made from bisilicides of d-elements of 4 to 7 group of the Periodic System modified by different quantity of carbon art presented. The main kinetic parameters of the process have been determined.
Summary: An effect of physico-chemical barriers on distribution of caesium-137 and other chemical elements has been considered on the example of landscape-geochemical profile "White Marsh" formed under conditions typical of polesje landscape in a boundary region of the marsh. A detailed landscape-geochemical characteristics of the profile is presented.
Summary: Interrelation between structure parameters and stress-strain properties of polymer-filled compositions has been revealed by scanning-electron microscope technique. A possibility has been shown to control structure formation processes due to mechanical-chemical activation of disperse phase (peat). This permits for materials with predetermined properties to be produced.
Safonova A.M., Shchurevich O.A., Batura S.V.
Investigation of carbonisation process of Ni-Mn-containing hydrate cellulose and formation of Ni-Mn-carbon fibers. pp. 89--93
Summary: Regularities of thermal transformations of Ni-Mn-containing hydrate cellulose and formation of Ni-Mn-carbon fibers have been investigated. Effect of the introduced salts thermolysis on direction, rate and temperature of separate decomposition steps, as well as on yield, structure and properties of Me-carbon fibers formed has been revealed. Catalytic effect of bimetallic Ni-Mn-phase on carbon fiber graphitisation and improvement of their wetting by the phosphate binder has been shown.
Azarko V.A., Dikusar E.A., Lysenko G.N.
Transformation of dianhydrate of perylen-3,4,9,10-tetracarboxylic acid into diimide and determination of a conversion degree by IR-spectroscopy technique. pp. 94--97
Summary: It has been shown that 5-fold treatment of dianhydrate of perylen-3,4,9,10-tetracarboxylic acid with 25% aqueous solution of ammonium hydroxide in the presence of ammonium carbonate followed by heating at 300 ± 10°C leads to 98.0% conversion into diimide. To determine quantitatively a conversion degree IR-spectroscopy technique has been used.
Zhdanovich I.B., Markin A.D., Mozheiko F.F., Shlomina L.F.
Application of ethylene oxide oligomer during potassium ore flotation. pp. 98--101
Summary: An effect of oligomer molecular mass of ethylene oxide on technical values of potassium ore flotation, methods of oligomer introduction as well as effectiveness of their usage with different reagents have been investigated. Ethylene oxide oligomers of molecular mass of 318--20000 have been shown to substantially intensity potassium ore flotation i.e. readily win potassium chloride and decrease amine specific consumption.
Belous N.Kh., Samuskevich V.V.
Effect of fiber fillings on physico-mechanical properties of acrylic materials. pp. 102--106
Summary: Introduction of carbon and aluminooxide fibers has been established to improve such properties of filling cement, plastics and composites as these determining duration of their action in caries cavity.
Krutko N.P., Opanasenko O.N., Starostina O.I., Ovseenko L.V., Bukovski A., Zelinski Ya., Gurdzinska E.
Effect of mineral oils on properties of bitumens. pp. 107--110
Summary: The effect of mineral oils of Mozyr and Novopolotsk oil-refining plants on rheological properties of paving bitumen has been investigated in order to use them for bitumen emulsion preparation. It has been shown that additions of mineral oils permit to modify bitumen properties in accordance with user demands.
Dammazh G.A., Babenko E.M., Tkachev S.M., Pokrovskaya S.V.
On intermolecular interactions during tar activation by sulfonate containing substances. pp. 111--113
Summary: Intensification of bitumen preparation by tar oxidation with air oxygen has been regarded. To intensity the process sulfonate containing substances are introduced, in particular, mixture of tar with acidic tar neutralised by calcium hydroxide. Introduction of 2 mass % of such an additive into the tar has been established to decrease a size of its disperse particles, resulting in extremal decrease of viscosity and activation energy of viscous flow.
Summary: Zoning of Gomel city territory according to a pollution level based on calculations of potential of volumetric pollution of the city atmosphere from stationary and mobile sources has been carried out followed by map making of the atmosphere volume pollution. The sites of zones with the heaviest pollution levels of air have been marked.
Kakareka S.V., Khomich V.S., Kukharchik T.I.
The technogenic pedogeochemical anomalies of lead in the region of city of Gomel. pp. 119--122
Summary: Spatial structure of Gomel soil contaminations with lead have been investigated. Main features of soil contamination with lead have been established to be caused by deposition of road traffic emissions. These anomalies combine with dispersion halos of some plants ("Korall", "Gomselmash", etc.). Local intensive anomalies due to soil contamination with wastes have been also revealed.
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