CHEMICAL TECHNOLOGY (inorganic and organic substances. Theoretical fundamentals)

INCREASE IN SORPTION ABILITY OF BACTERICIDAL TEXTILE MATERIALS

The influence of various factors on the change in the sorption ability of textile material depend-ing on the nature of the material, the composition of biocomposite, type of mineral additives was stud-ied. Possible ways of increase in sorption of the textile materials possessing bactericidal properties were shown.
Key words: bactericidal materials, medical textiles, humic compounds, sorption ability

2016, Т. 59, № 1, Стр. 72-75

FILM-FORMING POLYFUNCTIONAL OLIGOBUTADIENES AND LOCAL DYNAMICS OF CROSS-LINKED...

FILM-FORMING POLYFUNCTIONAL OLIGOBUTADIENES AND LOCAL DYNAMICS
OF CROSS-LINKED STRUCTURES ON ITS BASE
The process of film-forming of polyfunctional oligobutadienes of cationic type of different mi-crostructure from organic-film-forming systems in the presence of acid-type hardeners was studied. The method of computer modeling indicates on the impact of cross-linking agents on the type of cross-linking and the flexibility of the polymer chains determining the physical and performance properties of the materials. A scientific approach to the creation of special purpose compositions with an improved combination of properties was proposed.
Key words: oligobutadiene, film-forming, acid-type hardeners, molecular dynamics simulation, chain microstructure, molecules local mobility

2016, Т. 59, № 1, Стр. 67-71

FORMATION OF ANODE ARSENATE FILM ON SILVER ELECTRODE

The single current peak is registrated on voltammograms of electro dissolution of precipitates forming on silver electrode into solutions containing arsenate ions. The precipitate amount is proportional to a concentration of arsenate ions in a solution. This amount can be used for ions determination. Opti-mal conditions for electro deposition and electro dissolution are recommended.
Key words: electro deposition, electro dissolution, silver electrode, arsenate film

2016, Т. 59, № 1, Стр. 63-66

ANODIC OXYGEN EVOLUTION ON IRON, COBALT AND NICKEL SILICIDES IN ALKALINE ELECTROLYTE

The kinetics of oxygen evolution reaction on iron, cobalt and nickel monosilicides in (0.1 – 5.0) M NaOH was studied using methods of polarization and impedance measurements. The values of deriva-tives dE/dlgi, dlgi/dpH, dE/dpH were determined. The oxygen evolution on FeSi, CoSi and NiSi elec-trodes in alkaline solution was established to have regularities which are characteristic to Fe, Co and Ni electrodes, respectively.
Key words: oxygen evolution reaction, iron silicide FeSi, cobalt silicide CoSi, nickel silicide Ni-Si, alkaline electrolyte, impedance

2016, Т. 59, № 1, Стр. 57-63

CATHODIC AND ANODIC PROCESSES IN SOLUTIONS OF ZINC SULFATE IN PRESENCE OF SURFACTANTS

We investigated the cathodic and anodic processes in solutions of zinc sulfate in the presence of a surfactant and the background solution of sodium sulfate over a wide potential range. It was shown that anionic surfactants increase the anode current and the cation ones decrease. An explanation for the increase in the magnitude of the anode current in presence of anionic surfactants and reduction in the presence of cation-active surfactant was done. Experimental data and thermodynamic calculations has shown that the reason for the lack of influence of surfactants on the magnitude of the cathode current for the background electrolyte solution of sodium sulfate is probably associated with the processes of sulfate reduction.
Key words: cathode and anode processes, zinc sulphate, surfactants, anode current

2016, Т. 59, № 1, Стр. 53-57

ELECTRODEPOSITION OF ZINC-NICKEL ALLOYS FROM ALKALINE COMPLEX ELECTROLYTES

Electrodeposition processes of zinc-nickel alloys from alkaline triethanolamine electrolytes were investigated. The possibility to obtain the good-quality electroplating was shown at current densities from 0.5 to 5.0 A/dm2.
Key words: coatings, galvanic alloys, nickel, zinc

2016, Т. 59, № 1, Стр. 51-53

DEVELOPMENT OF DIRECT METHOD OF TITANIUM SILVERING

The applicability of the dielectrics activation method to the problem solution of preliminary preparation of titanium before the deposition of metallic coatings was shown. The advantages over used in industry methods were focused. The optimum composition of the modifying solution and operation were defined.
Key words: titanium, chemical silvering

2016, Т. 59, № 1, Стр. 46-50

OXIDIZING REACTIVATION OF COPPER CATALYST FOR METHANOL SYNTHESIS

The change in phase composition and catalytic properties of a copper-containing catalyst for methanol synthesis which was deactivated under industrial operation was studied at its redox treatment. The possibility of catalyst partial reactivation was shown. Conditions of reactivation were choosen at the increase in catalyst running time.
Key words: methanol synthesis, deactivation, catalyst reactivation

2016, Т. 59, № 1, Стр. 42-45

STUDY OF SYNTHESIS FEATURES OF NANOCRYSTALLINE ZINC FERRITE

In work the process of formation of nanocrystal zinc ferrite was studied. The samples obtained were characterized with XPS, BET and SEM. The received samples have the developed surface. The av-erage size of crystallites determined by Debye-Scherrer equation was 3 nm.
Key words: spinels, ferrites, Debye- Scherrer equation

2016, Т. 59, № 1, Стр. 39-42
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