Abstract A method for the synthesis of electrically conductive pigment zinc oxide doped with a donor addition of gallium at a temperature of no more than 250°C is presented. Samples of electrically conductive pigment zinc oxide have been prepared and studied, the processes proceeding during its synthesis have been examined, and the dependence of the specific volumetric electrical resistance of pigment

Abstract An effect of hydrogen additions to the initial mixture on the parameters of the oxidative cracking of propane at atmospheric pressure, temperatures of 500–750°C, reaction time of 2 s, and С3H8/О2 initial ratio ~2 was experimentally investigated. It was shown that small amounts of hydrogen promote the process due to the formation of additional active radicals OH• and H•. Performance of the

Abstract A technique was tested for structuring a finely dispersed bulk ferrosilicoaluminum powder by cryogels based on an aqueous poly(vinyl alcohol) solution to prepare products of a desired shape using porous nitride-containing ceramics as a structural material. The physical and mechanical properties of the produced samples were investigated. It was found that the materials obtained after preliminary

Abstract The suspension polymerization in octafluorobutane, initiated by Ziegler–Natta catalyst system, has been used to synthesize ultra-high molecular weight poly(1-hexene), poly(1-octene), and poly(1-decene) of regular structure with high yields. This technique makes it possible to successfully carry out reactions at close to room temperature, followed by easy isolation of polymer products. The

Abstract Sorption of aluminum(III) and iron(III) from their individual solutions and of iron(III) impurity from Al2(SO4)3 solutions on macroporous resins, Puromet MTS9560 phosphonic acid cation exchanger and Puromet MTS9300 and Puromet S991 iminodiacetate ion exchangers, was studied. All the three resins show higher affinity for iron(III) than for aluminum(III). The Puromet MTS9560 cation-exchange

Abstract Organo-inorganic composite materials based on films of polytetrafluoroethylene and tetrafluoroethylene–hexafluoropropylene copolymer, modified with vanadium- and phosphorus-containing functional groups, were synthesized. The modified fluoropolymer films, especially those modified with phosphorus-containing groups, exhibit increased hydrophilicity. A change in the energy characteristics of

Abstract A copolymer of acrylamide (AA) and 2-acrylamido-2-methylpropane sulfonic acid sodium salt (AMPSNa) was prepared by inverse emulsion radical polymerization in the presence of azobisisobutyronitrile initiator. The effect of temperature, initiator, and sum of the monomers on the rate of inverse emulsion copolymerization of acrylamide and AMPSNa was studied by dilatometry. The kinetic parameters

Abstract This study evaluated a removal efficiency of NLFX from aqueous solutions using a photocatalytic process. In this study, Bi2WO6 were synthesized by microwave method and Ce was loaded on Bi2WO6 by wet inoculation method. The prepared photocatalysis were characterized by XRD, FTIR, SEM, EDS/Map, TEM, BET/BJH, DRS-UV/Vis analysis. The degradation of NFLX was investigated by the photocatalysis

Abstract It has been shown that the introduction of a polyaniline dispersion into an alkyd-urethane emulsion leads to a decrease in the average particle size of the modified dispersion. The introduction of undoped polyaniline results in an increase in the stability of the modified dispersion over the entire studied range of contents. It was found that the introduction of doped (up to 2.6 wt %) and

Abstract In this work, preparation and characterization of new classes of polybutadiene-based polyols and polyurethanes investigated with consecutive reactions namely, polybutadiene chain scission by a two- step oxidation procedure using meta-chloroperbenzoic acid and periodic acid to prepare terminal aldehyde functionalized polybutadiene, followed by telechelic amine polyol preparation by an amination

Abstract A comparative analysis of the life cycle of powertrains based on internal combustion engines powered by diesel fuel and natural gas, on batteries, and on hydrogen fuel cells was made. The inventory information on the stages of the life cycle of powertrains was collected, including production of structural materials and assembling of powertrain components, production of fuel and power, operation

Abstract Manganese hexacyanoferrate was synthesized by the hydrothermal method and its cubic structure was established. Manganese hexacyanoferrate powder was studied in the composition of a cathode material for sodium-ion batteries with an electronically conductive carbon black additive and a polyvinylidene fluoride binder polymer. The electrochemical properties of manganese hexacyanoferrate-based

Abstract Composite filamentary hydrogels based on cross-linked polyacrylamide, filled with TiO2 particles, were synthesized. The degree of crosslinking of the hydrogel matrix was set by the molar ratio of the cross-linking agent and monomer: 1 : 50, 1 : 100, 1 : 200, or 1 : 300. The diffusion of Methyl Orange dye in the polymer matrix as a function of the degree of crosslinking was studied by spectrophotometry

Abstract The effect of hybrid filling of polyethylene terephthalate with short glass fibers in amount from 15 to 60 wt % and multi-walled carbon nanotubes in amount of 0.5 and 1.6 wt % on the structure, static and dynamic mechanical properties of composites produced by blending in a melt by the method of reactive extrusion was studied. It was shown that nanotubes initiate heterophase crystallization

Abstract cis-1,4-Polyisoprene was prepared under conditions of the industrial production process using small high-performance diffuser–confuser tubular turbulent apparatuses in the stage of formation of titanium, neodymium, and gadolinium Ziegler–Natta catalysts, and characteristics of the synthesized rubber were determined. The catalytic systems can be ranked in the following order with respect to

Abstract A procedure was developed for preparing 2,3-dialkyl-substituted succinates by condensation of a succinic acid diester with two isobutyraldehyde molecules, followed by esterification and hydrogenation of the sum of dienes. Diethyl 2,3-diisobutylsuccinate of 75–99% purity was prepared by this procedure in a good yield. The use of the synthesized diethyl 2,3-diisobutylsuccinate as a stereoregulating

Abstract Lithium–lead alloys are of main interest in the liquid state. They were subjects of numerous studies, in particular, of those dealing with structural ordering in the liquid phase. Lithium–lead alloys show promise for use in liquid metal energy conversion systems and in nuclear power engineering. The results of studying thermodynamic properties of liquid Li–Pb alloys by various methods in the

Erratum

Abstract The electrodialysis method is used to recover iron, nickel and copper from waste water generated in the manufacture of printed circuit boards. The objects of study were ion-exchange membranes PC Acid 60 (PCCell GmbH) and CM (H) RALEX® (MEGA) and model solutions containing heavy metal ions (Fe3+, Ni2+, and Cu2+) and SO42– и NO3– anions. The time dependences of the retention coefficients of

Abstract Polyurethane hydrogels containing polyethylene glycol as a linear fragment and incomplete β-cyclodextrin nitrate as a cross-linking agent were synthesized. The polyols were cross-linked with 1,6-hexamethylene diisocyanate. The hydrogel swelling ratio was studied as a function of the content of partially nitrated β-cyclodextrin in the hydrogel, molecular mass of polyethylene glycol, and degree

Abstract The ability of carbon black samples of grades N115, N339, and OMCARB S820 to adsorb Alizarin Red S was studied. The physicochemical properties (textural characteristics, elemental composition, qualitative composition of oxygen-containing groups) of the initial carbon black samples were studied. The adsorption isotherms of Alizarin Red S on carbon black samples in the examined concentration

Abstract Alkylation of phenol with tert-butanol in a displacement draining-film reactor on a heterogeneous catalyst, Beta zeolite, was studied. Optimum process conditions ensuring the maximal p-tert-butylphenol yield were determined: phenol : tert-butanol molar ratio (3–3.5) : 1, superficial liquid velocity 1.0–1.5 m3 m–2 h–1, and temperature 100–110°C. A procedure ensuring 100% conversion of tert-butanol

Abstract The efficiency of application of magnesite as an active filler of an epoxy polymer has been proved, which improves strength and changes physicochemical properties of epoxy composites. The optimal content of magnesite as a structuring additive and as a filler in the epoxy composition (0.1 and 100 wt %) was selected, at which magnesite strengthens the epoxy composite. It has been found that

Abstract A study of the photodestruction of metal-containing organic dyes that absorb light in the near-IR region of the spectrum has been carried out. The light fastness in the polymer matrix of both individual dyes and their binary mixtures with monoazo dyes of the pyrazolone series has been studied. The study was performed during 10 h of insolation. The degree of decomposition of the dye under the

Abstract A method for production of polyurethane coatings with low surface energy modified with a block copolymer polydimethylsiloxane–polyphenylsilsesquioxane is presented. Surface characteristics of coatings were studied by methods of measuring the contact angle, attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy and scanning electron microscopy with X-ray spectral microanalysis

Abstract The hydrolytic stability of calcium and magnesium phosphates in aqueous solutions was studied in a wide pH range and in the presence of NaCl and CaCl2 electrolytes: calcium hydrogen phosphate and tricalcium phosphate are stable at pH 4.5‒10.0, and hydroxyapatite, at pH 3.0‒12.0. An increase in the ratio of the solution volume to the weight of phosphates from 250 to 500 mL/g leads to an increase

Abstract Methanol conversion to dimethyl ether using alumina-modified silica gel based adsorbents was studied. ASM, ASM VS, BASF KC-Trockenperlen H, BASF KC-Trockenperlen WS, and NIAP-AOS adsorbents used in industrial adsorption installations for natural gas treatment were tested. The composition and structural characteristics of the commercial adsorbents were characterized by X-ray fluorescence and

Abstract Dense composite materials Al2O3–SiCw with a whisker volume fraction of up to 30 vol% were formed by the methods of liquid-phase sintering and hot pressing. In the presence of 10 vol % SiCw, the density of liquid-phase sintered and hot-pressed materials is decreased to 97.3 and 98.0% of the theoretical density, respectively. For liquid-phase sintered materials, the compositions Al2O3 20 vol

Abstract Film samples of 30 : 70, 50 : 50, and 70 : 30 (wt %) polylactide–low-density polyethylene blends and of the pure components were prepared and studied. Polylactide and polyethylene absorb water weakly (about 2%), whereas the water absorption by the blends was higher, 4–8%. The thermal characteristics of the samples before and after the action of distilled water and a sodium chloride solution

Abstract Two methods for monitoring the physical aging of polymer membranes by gas permeability measurements are compared. The traditional method with intermittent permeability monitoring is compared to the continuous permeability monitoring when the membrane occurs under excess pressure of the permeating gas throughout the experiment. A composite membrane with a thin (1 μm) selective polytrimethylsilylpropyne

Abstract In this study, a nanocomposite of activated carbon modified by copper hydroxide nanoparticles and stearic acid with high hydrophobic–oleophilic characteristics was synthesized, characterized and used to remove vegetable oils from oil/water emulsion. Effects of different parameters such as initial pH, temperature, and concentration on oil removal from emulsion were investigated. Langmuir and

Abstract Reactive adsorption desulfurization of a model fuel containing dibenzothiophene with various adsorbents was studied. Adsorbents based on MCM-41 mesoporous material with supported Ni and ZnO phases were prepared and characterized. The desulfurization activity of the material in a fixed-bed flow-through reactor was compared to that of alumina-based adsorbents. The adsorbent based on MCM-41 considerably

Abstract n-Propyl bromide has substantial industrial importance, mainly in the field of agrochemicals and pharmaceuticals. The present work provides an improved, efficient, cost effective and industrially scalable preparation of n-propyl bromide starting from n-propanol, liquid bromine and sulfur with yields up to 95%. The levels of unwanted products like water content, n-propanol and isopropyl bromide

Abstract Derivatives of hydrazine and α-branched tertiary carboxylic acids of fractions C10 and C15–C19: 1,2-diacylhydrazines C10, hydrazides C15 –C19, N ′,N-dimethylhydrazides C15–C19, N ′,N ′-dimethylhydrazides C10 and hydrazides C10 in the form of 0.1–0.5 M solutions in kerosene were tested as extractants of lanthanide ions Y, La, Ce, Sm, Er, and Yb in acidic aqueous media. The best extraction properties

Abstract A procedure allowing preparation of mixed metal–carbon nanostructures from electroplating waste in a high yield was suggested. The following substances containing all the metals from the initial slime can be prepared from electroplating slimes (containing mainly iron or copper): metal phthalocyanines, phthalocyanine pyrolyzates, mixed endometallofullerenes, and their hydroxylated derivatives

Abstract The strength and wettability of polyacrylonitrile technical cord and of hydrated cellulose and basalt technical threads, treated with organosilicon dressing agents, were evaluated. The modified threads show enhanced surface activity. The kinetic features of epoxy binder curing in the presence of the modified threads were studied. Introduction of the fibrous fillers under consideration improves

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Erratum

Abstract A method is proposed for producing a magnetic carbon material based on the deposition of a labile iron compound on a carbon matrix and its subsequent thermolysis with the formation of magnetite. The method is implemented by applying magnetite to activated carbon BAU-A during the decomposition of iron(II) oxalate. The production of a magnetic carbon material has been confirmed by X-ray fluorescence

Abstract The batch processing of an organic solvent methyl tert-butyl ether with obtaining a product of high purity was investigated. The separation coefficients of methyl tert-butyl ether and the main impurities contained in the technical product are found. Static and hydrodynamic parameters of the process were determined. The efficiency of the batch processing method for low-tonnage production of

Abstract Various options for designing the direct oxidation of natural gas to methanol are considered: flow-through, with a distributed supply of the oxidizer along the length of the reactor, and circulation. For each of the considered options for designing the process, the methanol yield was calculated, as well as the parameters at which the resulting blow-off gas can be used as a fuel. The optimal

Abstract This study was made with the aim of developing a process for liquation fusion of rare earth–rare metal ocherous ores of carbonatite weathering crust deposits. The formation of two immiscible melts, silicate and phosphate–salt, in the monazite–SiO2–NaF–Nb2O5 system was studied. The melt liquation field in the isotherm occupies 50% of the diagram area at 1200°C, 39.0% at 1100°C, 20.0% at 1000°C

Abstract The effect of cationic and anionic impurities on the varistor properties of high-voltage ZnO ceramics with a ZnO content of 75 wt % and a weight ratio of oxides of alloying elements Bi2O3:Sb2O3:Al2O3:Co3O4:NiO = 1.00 : 0.45 : 0.80 : 0.65 : 0.53 has been studied. It was found that anionic Cl–, F–, SO42–, PO43– and cationic Li+, Na+, K+, Cs+ and Mg2+ impurities worsen, while cationic impurities

Abstract Magnetic nanoparticles and clay minerals combine to form a class of advanced nanocomposites that would possess exceptional adsorption, magnetism, and stability. In this work, an environmentally friendly nanocomposite was successfully fabricated by functionalizing natural clay. Bentonite сlay/meghemite nanocomposite was synthesized by the co-precipitation method and used to Methyl Orange pollutant

Abstract Extraction of undesirable components from light catalytic cracking gasoil with N-methylpyrrolidone was studied. Extraction conditions were chosen, and the influence of the solvent to feed ratio on the process results was determined. Low solvent to feed ratios are favorable for obtaining highly concentrated extracts for the subsequent production of a liquid organic hydrogen carrier from them

Abstract Polysiloxanes containing nonchelating 3-aminopropyl and chelating N-(2-aminoethyl)-3-aminopropyl groups with the degree of functionalization of 28 and 24%, respectively, were prepared by sol–gel synthesis. The polysiloxanes obtained showed comparable activity in sorption of Pd(II), Pt(IV), Fe(III), Cd(II), Zn(II), Co(II), Ni(II), Cu(II), Mn(II), Pb(II), Ca(II), and Mg(II) ions from model multicomponent

Abstract Films of TiO2 nanorods prepared under different conditions of hydrothermal synthesis were studied. With an increase in the hydrothermal synthesis temperature at a synthesis time of 24 h, the length of the TiO2 nanorods formed first increases and then decreases, and the nanorod diameter changes. The TiO2 film consisting of nanorods 4100 nm long and 100 nm in diameter, prepared at 180°C, exhibits

Abstract The thermal properties of individual precursors, zirconium(IV) and yttrium(III) dipivaloylmethanates, and of their mixtures [Zr(thd)4–Y(thd)3, Hthd = 2,2,6,6-tetramethylheptane-3,5-dione] used for preparing mixed oxide films by chemical vapor deposition were studied in the condensed and gas phases. In the condensed phase, the vaporization rate of both individual compounds and their mixtures

Abstract The practical and theoretical aspects of the conversion of sulfur-containing components during the hydroconversion of heavy oil feedstock in the presence of nanosized MoS2-based catalytic systems are considered. Thermodynamic calculation of the temperature dependences of the equilibrium composition of the products of hydrogenation reactions of sulfur-containing compounds demonstrated that

Abstract Various steps of the formation of nanocomposite coatings using organic-soluble film-forming agents are accompanied by changes in the structure of the aluminosilicate nanofiller under the action of various factors. Taking these factors into account is necessary for the development of coatings of preset structure with optimum properties. Swelling of various organoclays in pure and technical

Abstract Five derivatives of neopentanoic acid hydrazide were studied and their physicochemical properties (solubility, protolytic equilibria, hydrolytic stability), which determine the possibility of using reagents in the flotation processes of concentrating non-ferrous metals, were characterized. The composition of the complex compounds of the reagents with Cu(II), Ni(II), and Co(II) in solutions

Abstract Sulfur is present in crude oil and petroleum products in the form of various compounds: mercaptans, hydrogen sulfide, sulfides, disulfides, thiophene derivatives, high-molecular-mass heterocyclic compounds, etc. The content of elemental sulfur in petroleum feedstock is low (up to 0.1%). Sulfur negatively affects the service and transportation properties of oil; therefore, the content of sulfur

Abstract A technique has been developed for determining the stage rate constants of chemical reactions proceeding in an isothermal gradientless reactor according to the nonideal kinetic law of Marcelin–De Donder by non-stationary data. The technique allows estimating the ranges of variation in the values of the stage rate constants accounting for errors in measuring the concentrations of reagents without

Abstract Fabrication of ceramic UO2 fuel pellets using microwave radiation was studied. The UO2 powder was prepared by microwave denitration of a nitric acid solution containing 400 g L–1 uranium. The tapped density (2.39 g cm–3) and total specific surface area (2.70 m2 g–1) of the powder obtained met the requirements to the powder for nuclear fuel fabrication (TU (Technical Specification) 95 414–2005:

Abstract A spectral-kinetic investigation was carried out to study the fluorescent properties of complexes of molecules of photochromic nitro-substituted spiropyran with metal cations differing in electron affinity in polymer matrices of various nature. It is shown that the photoinduced dynamic color change is determined by the change not only in the absorption, but also in the luminescence of complexes

Abstract Composite Langmuir–Blodgett coatings of cerotinic acid with boron nitride of the hexagonal allotropic modification (α-BN) were formed by horizontal deposition on silicon and steel surfaces. Their morphology and tribological properties were studied. It was shown that the incorporation of α-BN particles into cerotinic acid monolayers increases their wear resistance by 3.5 and 3.0 times on silicon

Abstract Ion-exchange fixing was performed and the state of Ni2+ cations in a perfluorosulfone membrane was described. Changes in the electronic absorption spectra of Ni2+ in the dehydration prodess and subsequent interaction with water vapor are considered. The possibility of employing a modified membrane for visual control of air humidity was shown.

Abstract The present study aimed to design PCL–PEG–PCL copolymer as novel nanocarrier for co-loading of docetaxel (DTX) and quercetin (Qu) drugs and decrease side effects of the drug. To this end, tri-block-copolymer of PCL–PEG–PCL synthesized and DTX and Qu co-encapsulated into the mentioned nanocarrier with mass ratios of 0/0/20 (P0), 2/0/18 (P1), 4/0/16 (P2), 2/2/16 (P3), 4/4/12 (P4), respectively

Abstract Mesostructured silicates MCM-48, SBA-15, and MCM-41 were synthesized, and the corresponding ordered mesoporous carbons CMK-1, CMK-3, and CS41 were prepared on their basis. Disordered mesoporous carbon WMC was prepared on the basis of amorphous SiO2. The carbon materials obtained were taken as supports for Pt electrocatalysts, which were tested in a model reaction of oxygen reduction. The supports

Abstract Here, we report the enhanced optical and electrical properties of graphene oxide-silver nanoparticles (GO-AgNPs) nanocomposite due to thermal annealing in air at different temperatures (150, 250, and 350°C). Our findings show that the optical properties of the GO-AgNPs film strongly depend on the annealing temperature. With an increase in annealing temperature, the optical absorption band