Ukrainian Chemistry Journal

Contents of Volume 81 №4 (2015)

Inorganic and Physical Chemistry

POGORENKO Yu.V., PSHENICHNYI R.N., OMELCHUK A.A.
The conductivity of heterovalent substitution solid solutions lead (II) and tin (II) fluorides
  • Summary: It has been shown the results of investigations of transport properties of system KYF4— PbF2 and PbF2—YF3—SnF2 with depending of composition and structures that are found. It has been synthesized the heterovalent substitution solid solutions хKYF4 —(1–х)PbF2 (0.47 х 0.69) and (1–х)PbF2—хYF3— SnF2 (0 х 0.17) that contain structurally-nonequivalent fluorine ions. The conductivity of obtaining samples mainly provided interstitial fluorine anions. Electronic conductivity of synthesized phases is 2–3 orders lower than ionic.
  • pp.: 73 - 78

DIAMANT V.A., TRACHEVSKII V.V., KAZDOBIN K.A.
Microwave-assisted synthesis of bis(oxalato) alkali metal borates
  • Summary: The synthesis of Na-, K-, Rb-, Cs -bis- (oxalato)borates (NaBOB, KBOB, RbBOB and CsBOB) was carried out by microwave method. Application of the method allowed to shorten the synthesis duration in 8—10 times and to obtain the product with the product yield near to quantitative. The structure of compounds was proved by IR- and NMR-spectroscopy, thermogravimetry and RSA methods were implemented to prove the purity of reaction products and the nature of additives.
  • pp.: 79 - 83

MALAKHOVSKAYA T.A., FILEP M.I., SABOV M.Yu., BARCHII I.Ye., PERESH Ye.Yu., SOLOMON A.M.
Quasi-binary sections and comparative analysis of interaction of ternary systems Tl—Pb—Se(Te)
  • Summary: The analysis of literature data for the physico-chemical interaction in ternary systems Tl—Pb —Se(Те) was performed and a few controversies in previous investigations was found. Using the XRD method the triangulation of ternary systems Tl—Pb—Se(Те) was made, the quasibinarity of Tl2Sе(Те)—Tl4PbSe3(Тe3), TlSe—PbSe sections were confirmed and the first time the quasibinarity of Pb—Tl4PbSe3(Тe3), Tl—Tl4PbSe3- (Тe3) and Tе—Tl4PbТe3 sections were established. The comparative analysis of the interaction in systems Tl— Pb—Se(Те) was performed.
  • pp.: 84 - 87

PEREPELITSA A.P., SAMCHUK A.I., PISCHAI I.Ya., PETRENKO T.V., ISCHENKO V.N.
Study of chemical properties of calcium carbonate sediment
  • Summary: The composition of carbonate sediments of two different sugar factories and mixtures of these sediments with oxides of boron, silicon, vanadium, molybdenum and tungsten are investigated for methods chemical and thermogravimetric analysis; the temperature intervals of such interaction was determined. It is shown how feasibility of receiving oxide materials and biologically active mixture from carbonate sediment.
  • pp.: 88 - 91

ZHELTVAI I.I., MESHKOVA S.B., DOGA P.G.
Luminescent properties of europium complex with nalidixic acid
  • Summary: The europium (III) with nalidixic acid complex developing bright red luminescence at irradiation with ultraviolet light was isolated from water solutions by precipitate method. The probabilities (A0J) of Eu3+ several transfers (5D07FJ (J = 0–4)) and luminescence (Qem) intrinsic quantum yield, characterized the ability of radiative processes to compete with nonradiative, were calculated by use of luminescence spectra parameters and average lifetime (exp =0.72ms).
  • pp.: 92 - 97

YURCHENKO O.I., BAKLANOV A.N., BELOVA Ye.A., KALINENKO O.S., BAKLANOVA L.V., LARIN V.I.
The intensifikation of products dry mineralization by the oxidant vapors with IR-emission
  • Summary: The using of the combined action of oxidant vapors and IR-emission for the intensification of food products dry mineralization were studied. It is shown the rapidity of the process is increased by 2–4 times in comparison with the classic version of dry mineralization. The metrological characteristics of the analysis are no worse than standard method.
  • pp.: 98 - 107

Electrochemistry

KUTSYI A.V., MANILEVICH F.D., KOZIN L.F.
Comparative investigation of anodic processed at rhodium- coated titanium electrodes, rhodium and platinum electrodes in sulfate solutions
  • Summary: Titanium electrodes with an electrolytic rhodium coating have been developed for use as anodes for the synthesis of persulfates by the electrolysis of sulfate solutions. A rhodium coating with micro- and nanostructured surface has been obtained. Comparative studies of the regularities of anodic processes at the developed electrodes and at smooth rhodium and platinum electrodes in a 20 % sulfuric acid solution at several temperatures and over a wide range of current densities and potentials have been carried out. It was found that the oxygen evolution overvoltage (a) at a current density of 100 mA/cm2 and a temperature of 55 oC at titanium electrodes coated with rhodium is 597mV greater than at rhodium, and 849mV greater than at platinum. High a values are needed to obtain persulfates with high current efficiency. It has been shown that in the electrolysis of acidic solution of ammonium sulfate, the current yield of persulfate depends also on the current density, the presence of ammonium rhodanide additive in the solution and the duration of electrolysis.
  • pp.: 103 - 109

LYSENKO L.L., MISHCHUK N.A., BOROVITSKII N.Yu., RYNDA O.F.
Electroosmotic dewatering of fine clay materials
  • Summary: The investigations of the dependences of the value and sign of zeta potential for kaolinite particles on the pH of the dispersion medium are carried out. The regularities of the achievement of equilibrium pH of the pore solution and the electroosmotic velocity in the model dispersion depending on the concentrations of the introduced solutions of alkali and acid are studied. It is shown that there is a sufficiently wide interval of high pH values of pore solution, wherein the zeta potential of the particles and the velocity of electroosmosis through the dispersion remain almost constant values, creating optimal conditions for its dewatering. The main regularities of the kinetics and the efficiency of the dispersion dewatering using an electric field and pressure are established.
  • pp.: 110 - 115

KHODYKINA M.O., PERSHINA Ye.D., KAZDOBIN K.A.
Electrochemical properties of the immobilized enzyme preparations Raphanus sativus L. Var. niger on insoluble substrates
  • Summary: On studies of the adsorption of the enzyme composition of Raphanus sativus L. Var. niger on substrates with different acid-base properties (bentonite and its acid modified form) it was shown that by controlling electron or proton conductivity of the substrate the redox-activity of the immobilized native enzyme could be controlled. By the calculations based on the values of active resistance and reactance of the impedance spectra of studied systems the influence of the substrate material on the redox-activity of the final composite was shown as well as the possibility of the estimation of its stability in time.
  • pp.: 116 - 120

Chemistry of High-Molecular Compounds

RIABOV S.V., KOBRINA L.V., LAPTII S.V., TARASYUK O.P., ROGALSKII S.P.
Features of the complexation in the system -cyclodextrin—ionic liquid
  • Summary: Taking into account the specific properties of ionic liquids as surfactants and their ability to self-organize and to form a smectic liquid crystals, the results of research are interpreted and probable mechanism of the inclusion complex formation between -cyclodextrin and ionic liquids is proposed.
  • pp.: 120 - 123

GORDIENKO V.P., MUSTIATSA O.N., KOVALEVA G.N.
The structure, physical and mechanical properties of crystallizing systems linear polyethylene—nanosized carbides
  • Summary: It has been conducted the study of structure and properties of linear polyethylene under the influence of nanosized silicon carbide, titanium carbide and molybdenum carbide. The research has determined the optimal concentrations of these carbides for increase of hardness and heat resistance of crystallizing nanocomposites. The results are explained from the point of modifying the molecular and crystalline structure of the polymer by nanosized carbides.
  • pp.: 124 - 127

   

   

   

   

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