Subjects -> CHEMISTRY (Total: 928 journals)
    - ANALYTICAL CHEMISTRY (59 journals)
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    - PHYSICAL CHEMISTRY (65 journals)

PHYSICAL CHEMISTRY (65 journals)

Showing 1 - 64 of 64 Journals sorted alphabetically
ACS Central Science     Open Access   (Followers: 9)
ACS Physical Chemistry Au     Open Access   (Followers: 7)
ACS Sensors     Hybrid Journal   (Followers: 7)
Acta Physico-Chimica Sinica     Free  
Advances in Image and Video Processing     Open Access   (Followers: 20)
Advances in Physical Chemistry     Open Access   (Followers: 13)
Annual Review of Physical Chemistry     Full-text available via subscription   (Followers: 14)
Applied Materials Today     Hybrid Journal   (Followers: 1)
Biophysical Chemistry     Hybrid Journal   (Followers: 8)
Catalysis, Structure & Reactivity     Open Access   (Followers: 2)
Chemical Physics     Hybrid Journal   (Followers: 18)
Chemical Physics Letters     Hybrid Journal   (Followers: 17)
Chemistry and Physics of Lipids     Hybrid Journal   (Followers: 2)
Chinese Journal of Chemical Physics     Hybrid Journal   (Followers: 1)
Colloids and Surfaces A: Physicochemical and Engineering Aspects     Hybrid Journal   (Followers: 6)
Current Physical Chemistry     Hybrid Journal   (Followers: 1)
Doklady Physical Chemistry     Hybrid Journal  
EPJ B - Condensed Matter and Complex Systems     Hybrid Journal   (Followers: 1)
EPJ E - Soft Matter and Biological Physics     Hybrid Journal   (Followers: 3)
Friction     Open Access   (Followers: 4)
Geochemistry, Geophysics, Geosystems     Full-text available via subscription   (Followers: 35)
Glass Physics and Chemistry     Hybrid Journal   (Followers: 1)
Handbook on the Physics and Chemistry of Rare Earths     Full-text available via subscription   (Followers: 2)
Indian Journal of Biochemistry and Biophysics (IJBB)     Open Access   (Followers: 3)
Indian Journal of Chemistry - Section A     Open Access   (Followers: 9)
International Journal of Polymeric Materials     Hybrid Journal   (Followers: 6)
International Journal of Quantum Chemistry     Hybrid Journal   (Followers: 5)
International Reviews in Physical Chemistry     Hybrid Journal   (Followers: 3)
Journal of Biophysical Chemistry     Open Access   (Followers: 3)
Journal of Chemical Physics     Hybrid Journal   (Followers: 36)
Journal of Chromatographic Science     Hybrid Journal   (Followers: 15)
Journal of Macromolecular Science, Part B: Physics     Hybrid Journal   (Followers: 2)
Journal of Physical and Chemical Reference Data     Hybrid Journal   (Followers: 4)
Journal of Physical Chemistry A     Hybrid Journal   (Followers: 28)
Journal of Physical Chemistry B     Hybrid Journal   (Followers: 48)
Journal of Physical Chemistry C     Hybrid Journal   (Followers: 36)
Journal of Physical Chemistry Letters     Hybrid Journal   (Followers: 26)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 3)
Journal of Quantum Chemistry     Open Access   (Followers: 1)
Journal of Radiation Research     Open Access   (Followers: 3)
Macromolecular Chemistry and Physics     Hybrid Journal   (Followers: 2)
Molecular Physics: An International Journal in the Field of Chemical Physics     Hybrid Journal   (Followers: 24)
Nature Communications     Open Access   (Followers: 323)
Open Journal of Physical Chemistry     Open Access  
Physical Chemistry     Open Access   (Followers: 2)
Physical Chemistry Chemical Physics     Hybrid Journal   (Followers: 29)
Physical Chemistry Research     Open Access   (Followers: 1)
Physical Review A     Full-text available via subscription   (Followers: 23)
Physical Review Accelerators and Beams     Open Access   (Followers: 3)
Physical Review B     Full-text available via subscription   (Followers: 33)
Physical Review D     Full-text available via subscription   (Followers: 11)
Physical Review E     Full-text available via subscription   (Followers: 41)
Physical Review Letters     Full-text available via subscription   (Followers: 133)
Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B     Full-text available via subscription  
Physics and Chemistry of Liquids: An International Journal     Hybrid Journal  
Physics and Chemistry of the Earth, Parts A/B/C     Hybrid Journal   (Followers: 10)
Plasma Processes and Polymers     Hybrid Journal   (Followers: 2)
Protection of Metals and Physical Chemistry of Surfaces     Hybrid Journal   (Followers: 15)
Revista Fuentes     Open Access  
Russian Journal of Physical Chemistry A, Focus on Chemistry     Hybrid Journal  
Russian Journal of Physical Chemistry B, Focus on Physics     Hybrid Journal  
Solid State Ionics     Hybrid Journal   (Followers: 5)
The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics     Hybrid Journal   (Followers: 29)
The European Physical Journal Special Topics     Hybrid Journal   (Followers: 1)
Similar Journals
Journal Cover
Protection of Metals and Physical Chemistry of Surfaces
Journal Prestige (SJR): 0.27
Citation Impact (citeScore): 1
Number of Followers: 15  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 2070-206X - ISSN (Online) 2070-2051
Published by Springer-Verlag Homepage  [2469 journals]
  • Electrodeposition of Zn–Co Coating and its Electrochemical
           Performance

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      Abstract: We report the acid chloride bath based electroplating of Zn–Co alloy on low carbon steel (LCS). As additives, the sulphanilic acid (SA) and gelatin were used for electroplating. The bath exhibited an anomalous co-deposition with a higher deposition of Zn over nobler Co. The role of bath composition, current density, partial current density, pH, and temperature on thickness, hardness, and corrosion resistance of deposit was studied. The corrosion behavior in 3.5 wt % sodium chloride solution and electrochemical behavior in acid chloride solutions of Zn–Co alloy coatings were studied using the potentiodynamic polarization method and cyclic voltammetry technique respectively. Mott–Schottky plot with positive slope confirms the development of n-type semiconductor layer at the interface of substrate and coating, which results in superior corrosion resistance of coatings. The colorimetric method has been used to estimate the composition of the deposit and further verified by energy dispersive X-ray spectroscopy (EDX) technique. The surface features and the topographical structure of the alloy film were obtained by scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. The results indicate that the Zn–Co alloy films exhibited superior corrosion resistance with the lowest corrosion rate (138 µm y–1). Hence this alloy coating will find suitable applications in automobile and aerospace industries.
      PubDate: 2022-02-21
      DOI: 10.1134/S207020512201004X
       
  • Amide Compounds as Corrosion Inhibitors for Carbon Steel in Acidic
           Environment

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      Abstract: The inhibiting effect of some amide compounds in a drug form in 1 M HCl solutions on carbon steel has been studied using some chemical and electrochemical techniques as mass reduction (MR), potentiodynamic polarization (PDP), electrochemical impedance spectroscopy measurements (EIS), electrochemical frequency modulation (EFM) techniques. The inhibition efficiency of carbon steel corrosion increases by increasing inhibitor dose. The effect of temperature on the corrosion rate was investigated by mass reduction method as the inhibition efficiency decreases by raising the temperature range. The thermodynamic and adsorption parameters were calculated and discussed. The adsorption of these compounds obeyed Langmuir adsorption isotherm. In addition, surface examination and morphological studies were applied towards the inhibited carbon steel sample by scanning electron microscopy (SEM), energy dispersed X-ray (EDX) and Atomic force microscopy (AFM) techniques.
      PubDate: 2022-02-21
      DOI: 10.1134/S2070205122010105
       
  • Elevated Temperature Wear Behavior of FeCr Slag Coating as an Alternative
           Coating Material for Caster Rolls

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      Abstract: The aim of this study is to show that ferrochrome (FeCr) slag, an industrial waste material, can be used as an alternative protective coating material in service conditions for the caster roll surfaces used in the continuous casting line of steelmaking. Atmospheric plasma spray (APS) method was utilized in coating processes. Considering the working conditions of continuous casting production line, the Thermal Barrier Coating (TBC) system was used as a basis for deposition processes. For production of the TBC system, the commercial NiCoCrAlY (Amdry, 45 + 5 µm) coating powder was initially deposited as metallic bond coat layer onto the surface of AISI 316L substrate, and then FeCr slag layer was successfully deposited as the top coating layer. After the deposition of FeCr slag powder, the resulting coating layer was found to have low porosity with a homogeneous microstructure. Dry sliding wear tests were performed under different loads (7N, 10N and 13N) and temperatures (200, 400 and 600°C) using a ball-on-disc test rig with heating unit. At low loads (7N, 10N) and temperatures (200, 400°C), predominantly spallation type abrasion was observed, while at high load and temperatures (13N, 600°C), the formation of tribolayer and delamination were the dominant wear mechanisms on the surface of FeCr slag coatings. According to the test results, it can be said that FeCr slag powder is a suitable candidate as a protective coating material against adhesive wear at elevated temperatures for caster rolls.
      PubDate: 2022-02-21
      DOI: 10.1134/S2070205121040146
       
  • Investigation of Inhibitory Effects of Chitosan on Pitting and
           Electrochemical Corrosion Behavior Caused by Sigma Phase in Duplex
           Stainless Steels (DSS)

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      Abstract: In this study, as a result of the heat treatment parameters applied to 2205 duplex stainless steel (DSS), the sigma phase formed in the microstructure and changes in the corrosion behavior of DSS due to this sigma phase were investigated in solutions with and without inhibitor. 1 g L–1 chitosan (CS) solution was used as an inhibitor. To investigate the effect of the inhibitor on the corrosion behavior, a pitting corrosion test was performed in the inhibitor and noninhibitor FeCl3 solution in accordance with the ASTM G48 standard. In addition, electrochemical corrosion experiments were carried out in a 3.5% NaCl corrosion solution with and without inhibitor, to investigate the effect of the inhibitor on electrochemical corrosion conditions. The effects of the inhibitor on DSS were examined by the stereo microscope, optic microscope (OM), scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FTIR) analysis. Weight loss and surface coverage measurements were performed to determine inhibitor efficiency. Phase analyzes of DSS samples were determined by X-ray diffraction (XRD) and energy-dispersive X-ray spectroscopy (EDX) analysis. As a result of the study, it has been determined that CS plays an effective inhibitor for DSS material, even in the presence of the sigma phase.
      PubDate: 2022-02-21
      DOI: 10.1134/S2070205122010154
       
  • Electrochemical and QTAIM Evaluation of Anticorrosive Properties of
           bis(1,4-Isomeric Pyridine Thiosemicarbazides) in Acidic Media

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      Abstract: bis(1,4-Isomeric pyridine thiosemicarbazides) (P2) was synthesized and the protection performance of P2 on the corrosion of AA1005 alloy in acidic solution was evaluated using potentiodynamic polarization and electrochemical impedance spectroscopy. Inhibition efficiency of prepared inhibitor increases as inhibitor concentration increases. It was shown that the adsorption of P2 on the surface of the aluminum takes place through both physical and chemical adsorption. Experimental results prove that inhibitor is of mixed type. The best fit to the experimental results was obtained using Langmuir adsorption isotherm. Meanwhile, quantum chemical calculations give evidence to experimental results. Analysis of the QTAIM results shows that the sulfur and oxygen atoms have important roles in local charge and energy transfer in parallel/ perpendicular directions of these molecular systems. All the studied methods are showing good correlation with each other.
      PubDate: 2022-02-21
      DOI: 10.1134/S2070205122010087
       
  • Coating of PANI/SnO2, PANI/ZnO Polymeric Nanocomposite on 304 L Stainless
           Steel by Galvanostatic Method and Investigation of Corrosion Behavior

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      Abstract: Abstract—In this study, Polyaniline (PANI) and Polianiline/nano metal oxide (SnO2, ZnO (0.1, 0.3 and 0.5 wt %)) are coated on the surface of the steel electrode by galvanostatic method. PANI, PANI/SnO2 and PANI/ZnO coatings were obtained at constant current 50 mA and 1200 s. Characterization of galvanostatically obtained coatings was carried out by FT-IR spectroscopy, XRD and SEM. The effectiveness of PANI, PANI/SnO2 and PANI/ZnO nanocomposite coating in preventing steel corrosion was investigated in 3% NaCl solution using the potentiodynamic polarization technique and electrochemical impedance spectroscopy. The experimental results indicate that as the amount of nanometal oxide (SnO2, ZnO) in the polymer matrix increases, the steel corrosion is reduced.
      PubDate: 2022-02-21
      DOI: 10.1134/S207020512201021X
       
  • Electrochemical Study of Corrosion Inhibition Behavior of
           Dehydroabietylamine Against Mild Steel in 1 M HCl

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      Abstract: Using potentiodynamic polarization technique, this study analyzed the corrosion inhibitory effect of dehydroabietylamine (DHAA) against mild steel in 1 M HCl. The inhibitor concentration and temperature effects were studied as well. According to these results, the efficiency of inhibition increased with the increase in the concentration of corrosion inhibitor and declined when the temperature increased. A calculation was made to determine the activation and kinetic parameters of the corrosion reaction and adsorption. The inhibitor surficial adsorption on the mild steel followed the Frumkin adsorption isotherm. A physical adsorption mechanism was suggested given the activation energy Ea and Gibbs free energy of adsorption \(\Delta G_{{{\text{ads}}}}^{^\circ }\) values. Atomic force microscopy (AFM) and energy-dispersive X-ray spectroscopy (EDX) techniques were used to investigate the mild steel surface after and before being exposed to 1 M HCl in absence/presence of an inhibitor.
      PubDate: 2022-02-21
      DOI: 10.1134/S2070205122010099
       
  • Investigation of Wear Behaviors of Nanodiamond Particles Added Chromium
           Coating on Porous Powder Metallurgy Specimens

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      Abstract: In this study, electrolytic coating of pure chromium and Cr-ND (nanodiamond) composite coatings were applied on pre-alloy metal powder metallurgy specimens. The effects of the coating conditions including the ND particles content and coating duration in the bath on tribological behavior of the chromium coatings were investigated. Characterization tests were executed using an optical microscope, SEM, EDS, XRD and AFM. The hardness and wear resistance of the Cr-ND coated samples were compared with pure chromium coated and non-coated specimens. After determination of the suitable coating conditions, a 1.2‑liter engine motor oil pump sprocket was chosen as an industrial application for the coating. The sprocket manufactured by pressing and sintering under the same conditions. The wear test of the sprocket was accomplished by using a new designed test configuration to simulate the actual working conditions with motor oil. The wear resistance of the Cr-ND coated samples and sprockets were compared with pure Cr coated, non-coated and induction hardened ones. The results demonstrated that the embedding of the ND particles in the chromium matrix led to an improvement on the hardness and wear behavior of the Cr-ND coatings in comparison to pure chromium coatings, noncoated and heat-treated specimens.
      PubDate: 2022-02-21
      DOI: 10.1134/S2070205122010208
       
  • Synergistic Corrosion Inhibition of Benzotriazole and Thiourea for
           Refineries and Petrochemical Plants

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      Abstract: In the present work, the synergistic effects of two corrosion inhibitors, thiourea and benzotriazole, on the corrosion behavior of copper in 1 M H2SO4 solution was investigated using potentiodynamic polarization and electrochemical impedance spectroscopy methods. Scanning electron microscope was used to study the surface morphology, and Fourier-transform infrared spectroscopy was employed to investigate the adsorption of corrosion inhibitor and the formed film. Electrochemical test results indicate that the corrosion inhibition is dependent on the concentration of corrosion inhibitor and its molecular structure. Simultaneous use of thiourea and benzotriazole leads to the achievement of higher corrosion inhibition efficiency for low concentrations of the corrosion inhibitors. The highest corrosion inhibition efficiency achieved is 96.6% at benzotriazole and thiourea concentrations of 100 and 50 ppm, respectively. The adsorption of these two corrosion inhibitors on the surface of copper resulted in formation of a protective layer, which occurs through both chemical adsorption and physical adsorption. Langmuir modified adsorption isotherm is the best fitting for experimental data.
      PubDate: 2022-02-21
      DOI: 10.1134/S2070205122010178
       
  • The Influence of the Atomic Part of Metal on the Surface Roughness and
           Electrical Resistance of Fullerite–Bismuth Films

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      Abstract: Atomic force and scanning electron microscopy, X-ray spectral microanalysis, X-ray phase analysis, and Raman scattering of light were used to study the surface morphology and elemental and phase composition, as well as the electrical resistance, of fullerite–bismuth films with different molecular flows on substrates of oxidized monocrystalline silicon. The dependence of the size of structural elements, main parameters of surface roughness, phase composition, and electrical resistance of films on the atomic fraction of bismuth has been established.
      PubDate: 2022-02-01
       
  • Structure and Oxidation Resistance of Titanium Silicide Ti5Si3–Titanium
           Binder Powder Composites

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      Abstract: In the gasless combustion mode of powder mixtures of titanium and silicon, titanium silicide Ti5Si3–titanium ligament metal–matrix composites were synthesized. The structure of the composites consists of silicide grains separated by titanium binder interlayers with a thickness that depends on the titanium content in the reaction mixtures. During oxidation in air at temperatures up to 1000°C, the predominant oxidation of the titanium binder occurs with the formation of titanium oxide TiO2 (rutile).
      PubDate: 2022-02-01
       
  • Laws of Cresol-Vapor Sorption on Highly Porous Materials of Biomodified
           Flax Shive

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      Abstract: To obtain effective mesoporous sorbents for air purification, flax shive was modified by biocatalyzed cleavage of hemicelluloses and pectin substances using fermentation products for redox transformations of lignin. The changes in the polymer composition and parameters of the pore structure of flax shive were estimated by the methods of sequential extraction of polysaccharides and low-temperature adsorption of nitrogen. The change in the state of lignin upon the binding of o- and p-cresols was traced by the method of Fourier IR spectroscopy. For samples of native and modified flax shive and lignin preparations isolated from them, the kinetics of adsorption of cresol vapors was analyzed in the temperature range of 298–313 K. An adequate description of the sorption process was obtained by using a kinetic model of pseudosecond order to determine the level of limiting sorption of cresols on glycans and lignin. The thermodynamic parameters of sorption were calculated from specific sorbate retention volume data. Modeling results made it possible to differentiate the contribution of polymeric components of the flax substrate and to estimate the ability of functional groups of lignin of the biomodified flax shive to sorption binding of cresol in ortho- and para-isomeric forms.
      PubDate: 2022-02-01
       
  • On the Mechanism of the Growth of Electronic Conductivity upon Reduction
           in the Excessive Deformation Volume of a Diluted Palladium–Hydrogen
           System

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      Abstract: A decrease in the excess deformation volume (a kind of “imprint” of the system after the stay of hydrogen in Pd) with an increase in the amount of hydrogen introduced into Pd (starting from H : Pd = 0.25) and then removed electrochemically. In parallel, an increase in the electrical conductivity of electrochemically dihydrogenated palladium hydrides by 12% in comparison with the initial samples of pure palladium in a wide temperature range (75–300 K) was recorded. This means that some of the hydrogen in the Pd (about 5.3 × 1015 atoms per sample) passed into a more compressed, highly conductive phase. In this case, an increase in electrical conductivity with respect to pure Pd can occur both due to the formation and propagation of highly conductive regions of palladium hydride and due to electron transfer (percolation, tunneling) between individual nanoclusters of quasi-metallic hydrogen, localized in the region of metal structural defects, namely, in vacancy clusters and inside the cores of edge dislocations, where the highest pressures in the lattice are achievable.
      PubDate: 2022-02-01
       
  • Hydrogen-Free CVD Deposition of Molybdenum Coatings

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      Abstract: The structure and morphology of CVD molybdenum coatings in the MoCl5–Cd system on substrates made of copper, stainless steel (12Kh18N10T), and Inconel X750 and ZhS6U-VI high-temperature alloys were studied by X-ray diffraction, scanning electron microscopy, and using thermodynamic calculations by the Miedema model. A loose, porous, and thin (0.1 μm) coating was formed on the copper substrate, while uniform and continuous coatings were observed on Inconel X750, 12Kh18N10T, and ZhS6U-VI, which were 0.3, 0.7, and 1.0 μm thick, respectively. In the series of substrates M1–Inconel X750–12Kh18N10T–ZhS6U-VI, the deposition rate of molybdenum increases (from 0.1 to 1.0 μm/h), the size of its crystallites decreases to 50 nm, and lattice microdistortions increase to 0.16%. The rate of deposition of the molybdenum coating based on the MoCl5–Cd mixture is consistent with the negative enthalpy of formation of intermetallic compounds of the equiatomic composition MeMo (where Me is the substrate metal), calculated by the Miedema model. The differences observed in the series of M1–Inconel X750–12Kh18N10T–ZhS6U-VI in the deposition kinetics, morphology, structure, and substructure of the obtained coatings are explained from the standpoint of the enhancement of the adsorption interaction between the substrate and MoCl5 and the chemical affinity of the substrate and molybdenum.
      PubDate: 2022-02-01
       
  • Features of the Anode Behavior of a Combined Titanium–Aluminum Electrode
           and the Physicochemical Properties of the Products of Its Dissolution

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      Abstract: The electrochemical behavior of a combined titanium–aluminum electrode in aqueous solutions of 1.0 M sodium chloride with additions of hydrofluoric acid has been studied. It is shown that, under open-circuit conditions, the combined electrode is a short-circuited element, the surface of which is practically equipotential and is characterized by the value of the potential located between the values of the corrosion potentials of aluminum and iron electrodes. With a low content of hydrofluoric acid, practically the entire anode current flows through the surface of the aluminum component of the combined electrode. In addition, with an increase in the HF concentration to 0.5 M, the titanium electrode is activated and the fraction of the current flowing is almost the same as the fraction of the current of the aluminum component of the anode. This makes it possible to regulate the dissolution rates of aluminum and titanium during their joint oxidation during the synthesis of precursors of metal oxides of a given phase composition by changing the ratio of the areas of the anode components.
      PubDate: 2022-02-01
       
  • A DSC- and X-ray Diffraction Study of Mixtures of Aluminum with 50 wt % of
           Aluminum Hydrate after Plastic Deformation under High Pressure

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      Abstract: Al + 50 wt % Al(OH)3 mixture was subjected to plastic deformation under a pressure of 1–4 GPa on an anvil-type high-pressure apparatus. The samples were characterized by the methods of differential scanning calorimetry and X-ray diffraction. The baric dependences of the enthalpy of aluminum oxidation and melting and the baric dependence of sizes of coherent scattering regions displayed the extremum points at the pressures of 1.5 and 2.5 GPa. The reasons for these features are the variations in the electron structure of aluminum and/or the mechanism of aluminum deformations at the specified pressures.
      PubDate: 2022-02-01
       
  • Adsorption Properties of a Functional Porous Material Based on a Zn–BTB
           Metal–Organic Framework Structure

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      Abstract: A Zn–BTB metal–organic framework structure was synthesized by the solvothermal method; it is characterized by micropore volume W0 = 0.67 cm3/g, effective radius of micropores х0 = 0.67 nm, and standard characteristic energy of benzene-vapor adsorption Е0 = 18.0 kJ/mol. The theory of volume filling of micropores was used to calculate the methane-adsorption equilibria on the synthesized Zn–BTB sample at temperatures over the range from 243 to 313 K and pressures up to 35 MPa; the differential molar isosteric heats of adsorption were evaluated. The maximum value of methane adsorption amounts to ~14.5 mmol/g at a pressure of 8 MPa and a temperature of 243 K.
      PubDate: 2022-02-01
       
  • Biocorrosion, Biofouling, and Advanced Methods of Controlling Them

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      Abstract: — Microbiologically influenced corrosion (MIC) and biofouling in the marine environment are two main mechanisms of marine corrosion. The present review summarizes the results of recent studies and demonstrates that both MIC and marine biofouling are closely related to biofilms on the surface of materials formed by marine microorganisms and their metabolites. As a result, to prevent the emergence of MIC and biofouling, it is important to control microorganisms in biofilms or to prevent adhesion and formation of biofilms. The present review describes research approaches involving the use of new materials and innovative technologies in combination with traditional chemicals to achieve longer-lasting effects with the least environmental pollution due to the emerging synergistic effect.
      PubDate: 2022-02-01
       
  • Physicochemical Studies of Material Obtained by Pressing and Sintering Al
           Powder Modified with V2O5

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      Abstract: The phase composition and morphology of a synthesized material based on aluminum powder modified with various concentrations of V2O5 (3, 5, 10 wt %)—compacted in the form of tablets and sintered at temperatures of 820 and 900°C in He and air—have been studied by X-ray analysis and electron microscopy. It is shown that the phase components are uniformly distributed in the plane of the microsection, and their ratio is determined by the temperature and time of annealing of the pellets. It has been established that, due to the activation of processes on the surface of modified particles of aluminum powder, it becomes possible to control the properties of interphase boundaries in oxidizing and inert media.
      PubDate: 2022-02-01
       
  • Energy Characteristics of Hydration of Synthetic Polyampholytes and Their
           Selectivity to Copper(II) and Nickel(II) Cations

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      Abstract: The characteristics of hydration of iminocarboxylic and aminophosphonic ion exchangers in the copper and nickel forms are obtained and compared to the selectivity of the polyampholytes to cations. It is found that the exchange of both cations is accompanied by the rearrangement of the first hydration shell of the sorbents, namely, an increase in the amount of water in the aminophosphonic ion exchanger and a decrease, in iminocarboxylic. The formation of coordinate ionic bonds between the functional groups of the ion exchangers and counterions decreases the total amount of the solvent in the sorbent. The advantage of using the sodium form for the sorption of cations manifests itself in the low values of the Gibbs energy of interfacial transfer of water, decrease in the total amount of hydration water, and increase in the energy of hydration of polyampholytes upon the transition to the form of the cation being extracted.
      PubDate: 2022-02-01
       
 
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