Abstract A model is proposed for the formation of spherical and treelike particles during the growth of diamond films by chemical vapor deposition (CVD) using a direct current electric discharge to activate. Spherical diamond particles are formed when the surface energies of different diamond faces are equal, which arises during growth with a certain temperature, depending on the parameters of the

Abstract The AA6061-T6 alloy is used in many industrial applications such as hydraulic pistons, aerospace and marine vehicle fittings, including the nuclear reactors due to their excellent joining and coating properties, high strength, good formability, high resistance to aquatic corrosion and neutron transparency. This study consists of high temperature oxidation for which the samples were oxidized

Abstract Using the lattice gas model, we consider a unified description of three types of two-phase interfaces (vapor–liquid, solid–vapor, and solid–liquid) in the vapor–liquid meniscus system inside a size-limited pore in the form of a rectangular parallelepiped. Pore walls are considered to be undeformable. They form the external field for a stratifying fluid. The state of coexisting “vapor in a

Abstract Computer simulation of the deposition of water vapor molecules on a rigid substrate at atemperature of 260 K are performed by the Monte Carlo method. Comparative calculations are carried out for the base face of a silver iodide crystal with an ideal crystal lattice and on the same surface with glassy-type disturbances of the crystal order. The thermodynamic characteristics are obtained by

Abstract— The structure, morphology, and chemical state of composites based on arrays of multiwalled carbon nanotubes and tin oxide (SnOx/MWCNT) obtained using the method of magnetron sputtering were studied using the scanning electron microscopy, transmission electron microscopy, energy-dispersive X-ray spectroscopy, and near edge X-ray absorption fine structure methods. It has been shown that porous

Abstract This review focuses on pressing issues of photoelectrocatalytic degradation of organic pollutants of wastewaters on semiconductor materials upon their irradiation with both UV and visible light of the solar spectrum. Various photoactive semiconductor materials were considered, including titanium dioxide (n-TiO2), zinc oxide, tungsten oxide, hematite, and composites based on n-TiO2 doped with

Abstract Polypropylene (PP) mixtures (10 wt %) with AgJ, V203, AgNO3, phenolic red, and phenolphthalein underwent plastic deformation at a pressure of 1 GPa on an anvil-type high-pressure device. It has been established by the DSC method that the enthalpy of PP melting in mixtures with inorganic components increased to 310 and 1840 J/g, while the enthalpy of melting was 62 J g–1 in the initial PP.

Abstract— A MIL-125 metal–organic framework structure was synthesized from titanium and 1, 4-benzenedicarboxylic acid. The specific micropore volume of the synthesized sample was found to be W0 = 0.59 cm3/g, and the specific BET surface area was SBET = 1320 m2/g. Analysis of the synthesized material revealed the possibility of its application for accumulating energetically important gases: methane

Abstract The effect of chemical modification on the sorption properties of cellulose with respect to Cu(II) ions has been studied. Modification was carried out through the oxidation of cellulose with sodium metaperiodate with the formation of dialdehyde cellulose, its subsequent interaction with 4-aminobenzoic acid and conversion into a derivative capable of chelating heavy metal ions. Analysis of

Abstract Corrosion inhibition propriety of (2E)-3-phenylprop-2-enal, known as trans-cinnamaldehyde (TCA) for mild steel in 1 M HCl medium was investigated by weight loss technique (WL), potentiodynamic polarization (PP), electrochemical impedance spectroscopy (EIS) and density functional theory approach, using the B3LYP/6-31G(d,p) basis level. It was shown that the inhibition efficiency augmented with

Abstract A synthesis method has been developed, and the electrochemical properties of a nanocomposite coating based on polyaniline (Pani) and thermally expanded graphite (TEG) on a substrate of anodized graphite foil in an aprotic lithium electrolyte have been studied. Stable suspensions of Pani–TEG were obtained by mixing a solution of Pani base in formic acid with TEG and subsequent ultrasonic treatment

Abstract Three nonionic surfactants molecules (NS) derived from a fused pyridine characterized by IR and 1HNMR spectra were synthesized and examined as inhibitors for the corrosion of aluminum (Al) in a solution of HCl (0.5M). Galvanostatic polarization, weight loss and electrochemical impedance measurements were utilized to detect the corrosion parameters. Efficiency of the percentage inhibition increases

Abstract Due to the directions and environmental legislations from RoHS (Restrictions of Hazardous Substances), WEEE (World Electrical and Electronic Equipment) and from various countries, lead is banned from alloy making. Lead free solder alloys thus become very popular in electronic package industries. The research people around the globe started searching for new lead free solder alloys which can

Abstract The photoelectric and optical characteristics of an organic solar cell (OSС) with a hole-transport layer based on a polyaniline complex and a photoactive layer with a bulk heterojunction based on P3HT polythiophene derivative and PC71BM fullerene have been studied. The results of modeling the optical properties of the functional layers and experimental measurements of the OSC characteristics

Abstract N,N'-bis (salicylaldehyde)-1,3-diaminopropane (Salpn) has been evaluated as corrosion inhibition for iron in 0.1 M HCl when the films of Salpn were self-assembled on the surface of iron to improve anticorrosion property of the substrate. Monolayer formation takes place when carbon steel is precoated in hot ethanolic/aqueous 1 mM Salpn solution for 10, 20 and 30 min, and rinsing the physisorbed

Abstract An analysis of the effect of dispersion of powders of zinc oxide, metallic zinc, and iron on the inelasticity of the polymer composition was carried out by comparing the temperature–frequency dependences and spectra of internal friction in the region of the glass-transition temperature corresponding to the occurrence of the α-relaxation process. The correlation of the internal friction spectra

Abstract In the present study, batch experiments were carried out to elucidate the potential of apricot stone activated carbon ASAC to remove Pb2+ ions from aqueous solution. ASAC was characterized by Bruanauer, Emmett and Teller surface area S = 80.08 (m2/g), Fourier transform infrared spectroscopy and scanning electron microscopy. The effects of various process parameters such as initial pH (2–14)

Abstract Powder metallurgy (P/M) technology, which is a method of mixing, pressing and sintering stages, has many advantages (complex designs, low cost) as well as disadvantages (porosity, low surface hardness). Nowadays, surface coating methods are preferred to eliminate the disadvantage of powder metallurgy methods. In this study, samples of 96.4Fe–Mn, 89.25Fe–7.24Cr–Mn, 82.12Fe–14.39Cr–Mn, 75.08Fe–21

Abstract Effects of concentration (2.0, 4.0, 7.0 and 11.0 vol %) and operating temperature (20.0, 40.0 and 60.0°C) on phosphate coatings formed on aluminum (AA1050) surfaces by cathodic electrochemical polarization (0.1, 0.4 and 0.6 A dm–2) in solutions containing ammonium and sodium phosphates, \({\text{MoO}}_{4}^{{2 - }}\) promoting ions, inorganic activators, buffers, softeners, as well as surfactants

Abstract The achievement of high corrosion inhibition performances by manipulating the molecular structure of organic substances has gained much attention in recent years. In this paper, POCl3 was synthesized and Cl atoms in phosphoryl chloride (POCl3) were replaced by aniline or phenyl hydrazine and their derivatives; the effect of the substitution on the corrosion inhibition performance for mild

Abstract The sorption interaction of chromium(VI) ions with carbon adsorbents was studied by the physicochemical methods of energy dispersive X-ray spectroscopy, IR spectroscopy, and modeling using the Firefly801 program. A probable sorption mechanism is proposed, which can be considered as the sum of processes determined by external and internal diffusion of ions, electrostatic interaction, and ion

Abstract In this study, the corrosion behaviors of composite materials produced by adding different amounts of B4C in two different antifreeze (50 and 100% monoethylene glycol) environments are investigated. Aluminum matrix composites produced are characterized by microstructure, density, and hardness measurements. Potentiodynamic polarization technique is used in corrosion studies. While the hardness

Abstract The conditions for carrying out molecular dynamics calculations of adsorption isotherms of gases and vapors in micropores of active carbons providing a quantitative coincidence of the calculated and experimental isotherms are considered.

Abstract The synthesis of ceramic coatings via conversion of metallic surface is the main route of corrosion resistance in the magnesium alloys. Using ceramic nano-particles as sealant in these coatings is very useful. In this study, the effect of applied current density and treatment duration on the alumina nanoparticle incorporation, corrosion resistance, and wear behavior of plasma electrolytic

Abstract Fe- and W-containing oxide heterostructures were formed on a titanium surface by plasma electrolytic oxidation in an alkaline tungstate–borate electrolyte containing complex Fe(III)-EDTA ions at anodic current densities of 0.1 and 0.2 A/cm2. According to the data of X-ray diffraction analysis, the composition of all the formed samples is dominated by tungsten oxide WO3 in a cubic modification

Abstract The dependences of the protective properties of the anodic oxide coatings on the AD31 aluminum alloy surface modified with nitrates of magnesium, potassium, and some 3d-elements on the composition of sealing solutions and parameters of finishing treatment were established by scanning electron microscopy, potentiodynamic polarization, electrochemical impedance spectroscopy, and salt spray chamber

Abstract Ceramic reinforcements are used in metal matrix composite materials to enhance the mechanical properties. Ceramic particles also improve the wear behavior of these materials because of their high hardness. In this study, the wear properties of Al 6061–B4C composite materials reinforced with B4C in different sizes were investigated. Al 6061 powders, which are mixed with B4C powders in three

Abstract The excess adsorption isotherms of pseudocumene from solutions in n-octane in zeolite NaX have been measured at 303.15, 338.15 and 363.15 K using the conventional static method. The absolute (limiting) adsorption values of the pure components have been measured by the pycnometric method. The absolute adsorption isotherms for the system have been calculated using a non-fitting three parameter

Abstract In this work, results of the synthesis of bimetallic nanoparticles (NPs) based on transition metals Pd, Ni, and Fe reduced by quercetin in reverse-micellar solution (RMS) of Н2О/AOT/isooctane are presented. Using fluorescence spectroscopy, the formation of bimetallic structure of PdcoreNishell NP is shown and a synergetic enhancement of optical absorbance is revealed in the plasmon resonance

Abstract Benzyl isothiocyanate (BITC) was used as anticorrosive agent for the corrosion mitigation of stainless steel in 0.5 M hydrochloric acid medium. The corrosion inhibition study of (BITC) was investigated by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques in the temperature range of 303–323 K. The study was done to get optimum inhibition efficiency

Abstract Mixtures of low-density polyethylene (Tm = 108°C, enthalpy of melting 80 J g–1) with 90 wt % indigo, lophine, bromcresol purple, spiropyran, phenol red, rhodamine, phenolphthalein, and fluorescein were subjected to plastic deformation under a pressure of 1 GPa on an anvils-type high-pressure apparatus. The study of deformed mixtures was carried out by the DSC method. The thermograms of heating

Abstract The area of local inelasticity in latex elastic polymers filled and unfilled with zinc oxide powder in comparison with metallic zinc was investigated by the method of internal friction. The studies were carried out in the wide temperature range of from –150 to 50°C of the method of freely damped torsional vibrations. In the spectra of the internal friction of polymers, several dissipative

Abstract The objective of this study was to investigate the use of manganese oxide nanocomposite to remove Cd(II) ions from aqueous phase. The adsorption behavior was studied as a function of adsorbent mass, solution pH, and contact time. The response surface methodology (RSM) by Box–Behnken design (BBD) was employed to evaluate the effects of these three parameters on the removal ratio of the Cd(II)

Abstract Composite electroactive coatings (CEACs) are prepared on the basis of polyaniline (PANI) and manganese compounds (MnOx) by potentiodynamic electrodeposition on activated graphite foil using aniline sulfate solutions in 1 M H2SO4. Manganese ions are incorporated into the CEACs in several ways. The electrochemical behavior of prepared CEACs is fundamentally similar to that of pure PANI in acidic

Abstract The present brief review presents the results of studies of the electrical conductivity and microwave properties of polymer composites based on Taunite-M and shungite for production of radiation-protective coatings. Anomalies in the behavior of the electrical conductivity of the composite at a concentration of Taunite-M of ≈5.0% have been found. The following results and conclusions have been

Abstract In the present study, we evaluated the effect of corrosion inhibition of ethanol extracts from Endostemon tereticaulis and Hyptis spicigera plants on mild steel in 1M HCl solution, using potentiodynamic polarization curves and electrochemical impedance spectroscopy (EIS). Also surface characterization techniques, namely scanning electron microscopy and X-ray energy dispersive spectroscopy

Abstract Ni–Co–BN (h) nanocomposite coating was prepared by jet electrodeposition (JED) under different temperatures. The surface morphology, element composition, crystal structure, microhardness and corrosion resistance of the samples prepared at different temperatures were analyzed and characterized by scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD)

Abstract Anticorrosive conductive coatings were prepared by adding solvents, dispersants, nickel powders, etc. to acrylic resin coatings with high viscosity, and conductive coatings were prepared on the surface of Q235 steel. The effects of nickel powder contents on the corrosion resistance of the conductive coating were investigated in a red soil solution, for which electrochemical impedance spectroscopy

Abstract The inhibition effect of cyclohexylphosphonic acid (CHPA) on the corrosion of structural steel (EN 10027) in 3.5% sodium chloride solution has been studied by using potentiodynamic polarization tests, electrochemical impedance spectroscopy (EIS) technique and weight loss measurements for a wide enough temperature range (298–328 K). Electrochemical results confirmed that the examined inhibitor

Abstract The present study examines the effect of shot peening on the wear behavior of austenitic high- manganese steels in both low and high silicon. For this purpose, austenitic steel with 17 wt % of manganese was cast with 0.6 and 6 wt % of Si. Surface work hardening was performed by using a shot peening device for 15 and 30 min on the samples followed by hardness, impact and wear tests by the dry

Abstract The inhibition effect of the synthetic nonionic surfactants (NIS) on the dissolution of carbon steel in 0.5 M H2SO4 solution has been demonstrated using different techniques. NIS compounds were characterized by IR and 1H NMR spectra. Corrosion parameters resulting from the techniques used confirm that inhibiting power of NIS compounds was increased with increasing NIS compounds, lowering temperature

Abstract Corrosion inhibition of synthesized eugenol acetate (EA), eugenol benzoate (EB), 3-allylanisol (AA) and dihydroeugenol (DHE), and commercially available eugenol (E), guaiacol (G) and safrole (S) on mild steel metal specimens investigated in 0.10 mol dm–3 NaCl solutions with the inhibitor concentrations of 100 and 200 ppm using mass loss measurements and electrochemical methods indicate that

Abstract Chromium oxide thin films were grown on Al2O3 substrates by ablating a pure Cr2O3 target using a KrF excimer laser. The energy density on the target surface was 1.4 J/cm2 with a pulse repetition of 3 Hz. The thin films were calcinated at 550°C for 1 h. The structural analysis of the grown layer was achieved using FTIR spectroscopy and X-ray diffraction techniques. The XRD analysis shows the

Abstract The results of comparative studies of hydrothermal aging of epoxy organic plastics based on the Rusar and Armos high-strength and -modulus aramid fibers are presented. Kinetic laws of moisture transport into the composites were established, the corresponding parameters were determined, and the kinetics of changes in the shear strength of organic plastics under forced exposure to heat and moisture

Abstract In order to investigate the improvement of the friction properties of metal rubber microfilaments (MRM) by surface texture and solid lubricating grease, the effect of laser surface texturing (LST) on the fretting friction and wear properties of microfilaments under solid lubricating grease was investigated. The laser marking machine was used to fabricate a ring groove array with equal spacing

Abstract The adsorption of Ni(II), Zn(II), and Cu(II) ions by electrogenerated gibbsite (γ-modification aluminum hydroxide) has been studied. Electrically generated gibbsite was obtained by electrolysis of aqueous solutions using aluminum electrodes. We used gibbsite obtained during the first 5 min of electrolysis. Such an adsorbent has an amorphous state and a network structure and, as a consequence

Abstract Expired Famotidine was tested as a corrosion protection for α-brass in 1 M HCl using modified methods: weight loss (WL), Tafel polarization (TP), AC impedance spectra (EIS) and electrochemical frequency modulation (EFM). The polarization resistance (Rp) data increased with increasing famotidine dose. The inhibition efficiency (IE) improved with raising famotidine concentration. The maximum

Abstract Recovery of the spent precious metal catalysts by suitable methods is very important for chemical industries. This work introduces a new method to provide the optimal conditions of the leaching of palladium from spent Pd/C catalyst in HCl–H2O2 system. Response surface methodology (RSM) and the Box–Behnken method with four independent variables including HCl concentration (wt %), H2O2 concentration

Abstract The article considers the hydrothermal formation of micrometric crystals of zeolite type FAU in aluminosilicate gels obtained from water suspension of natural phillipsite, treated with hydrochloric acid, mixed with sodium hydroxide, and followed by aging during several days at room temperature. At a high concentration of sodium in the reaction mixture, zeolite X with a high aluminum content

Abstract The present review is devoted to the sorption properties of magnetite towards hexavalent chromium ions and the possibility of its use as a sorbent for removing these toxic ions from contaminated aqueous solutions. The behavior of magnetite nanoparticles in aqueous solutions has been also investigated. It has been shown that two processes occur simultaneously during the sorption of chromium(VI)

Abstract The effect of the conditions for carrying out the reaction of liquid-phase hydrogenation of the nitro group on a bulk nickel catalyst in a binary water–alcohol solution has been studied. It is shown that each stage of the catalytic process leads to a change in the structure of the active nickel surface. The influence of hydrogen adsorption, adsorption of catalytic poison, and chemical effects

Abstract Three types of two-phase interfaces (vapor–liquid, solid–vapor, and solid–liquid) are considered in the “vapor and liquid meniscus” system inside a slitlike pore with rough walls. A unified description of these interface surfaces is given based on the lattice gas model that enables an equally accurate calculation of molecular distributions in heterogeneous distributed models of transition

Abstract In the present study, the superhydrophobic surface was fabricated by spray pyrolysis method. The precursor for the spray process was the modified Al2O3 (Alumina) with a fatty acid, which was dispersed in alcohol. Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TGA) was used to investigate the chemical reaction and amount of the fatty acid on surface of the Alumina

Abstract The adsorption of propane on an ACW supermicroporous adsorbent with a wide pore size distribution at pressures up to 1 MPa and temperatures of 303, 313, 323, and 333 K was studied. The maximum value of propane adsorption at a temperature of 303 K and a pressure of 1 MPa is equal to 21.6 mmol/g. The dependences of the differential molar isosteric heat of adsorption of propane on the value of

Abstract A flip-flop effect has been revealed at the anodization of aluminum oxide and subsequent electrochemical deposition of Co/Ni nanoparticles. The angle dependences of the reflection spectra of metallized anodized aluminum oxide films have been measured. Using the conditions of light interference in a thin film, the values of the effective refraction index and film thickness in dependence on

Abstract The tribological tests of brass and steel are carried out on an in-situ tribometer. The Stribeck curve illustrates that the roughness and the wear rate as a whole reflect the lubrication regimes. Under boundary lubrication, a mathematical model based on positive pressure and roughness is established. A good agreement between the measurement and the prediction is found. According to the analysis

Abstract Mixtures of high-density polyethylene and low-density polyethylene with 90 wt % adamantane, cyanuric acid, BeO, SiO2, KF, AgI, and AgNO3 were subjected to plastic deformation under a pressure of 1 GPa on an anvil-type high-pressure apparatus and studied by DSC. The endothermic processes were associated with the destruction of intermolecular bonds at the filler–polymer interfaces caused by

Abstract In the nickel–tungsten plating bath with MWCNTs, the influence of surfactants cetyltrimethyl- ammonium bromide (CTAB), sodium dodecyl sulfate (SDS) and Triton X-100 on the dispersion of MWCNTs were studied by using UV–vis spectrophotometer, to obtain the optimal concentration of surfactant. Ni–W–MWCNTs nanocomposite coatings were prepared in the bath with the optimal concentration of surfactants

Abstract Polymer materials, such as polyethylene, polypropylene, polyvinyl chloride, polybutadiene, and polyethylene terephthalate, are widely used in medicine, agriculture, mechanical engineering, and the textiles industry. As a result of the experimental study of these materials as concerns mycological resistance to the development and destructive effect of a mixed micromycete colony of Aspergillus

Abstract The effect of a series of organosilanes and their mixtures with corrosion inhibitors on the anticorrosion properties of polymer and paint coatings on steel, namely, on the adhesive characteristics of the coatings and corrosion behavior of the metal in the presence of coatings modified with organosilanes, corrosion inhibitors, and their mixtures, is studied. It is shown that mixtures of 1,2