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Doklady Physical Chemistry

Current research reports and chronological list of recent articles..




The international scientific forum Doklady Physical Chemistry is a monthly journal containing English translations of current Russian research in physical chemistry from the Physical Chemistry sections of the Doklady Akademii Nauk. The Journal presents short preliminary accounts of the application of the state-of-the-art physical chemistry ideas and methods to the study of organic and inorganic compounds and macromolecules; polymeric, inorganic and composite materials as well as corresponding processes.

The publisher is Springer. The copyright and publishing rights of specialized products listed below are in this publishing house. This is also responsible for the content shown.

To search this web page for specific words type "Ctrl" + "F" on your keyboard (Command + "F" on a Mac). Then: type the word you are searching for in the window that pops up!

Additional research articles see Current Chemistry Research Articles. Magazines with similar content (physical chemistry and chemical physics):

 - Chemical Physics.

 - ChemPhysChem.

 - Faraday Discussions.

 - International Reviews in Physical Chemistry.

 - Journal of Chemical Physics.

 - Journal of Physical Chemistry A.

 - Journal of Physical Chemistry B.

 - Journal of Physical Chemistry C.

 - Journal of Physical Organic Chemistry.

 - Physical Chemistry Chemical Physics PCCP.

 - Russian Journal of Physical Chemistry A.

 - Russian Journal of Physical Chemistry B.



Doklady Physical Chemistry - Abstracts



Ionic and Phase Compositions of Y2.5Ce0.5Fe2.5Ga2.5O12 Ferrogarnet Powder Produced by Gel Combustion

Abstract

The ionic and phase compositions of Y2.5Ce0.5Fe2.5Ga2.5O12 ferrogarnet samples obtained by gel combustion with subsequent vacuum annealing were studied for the first time by X-ray photoelectron spectroscopy and X-ray powder diffraction analysis. The X-ray powder diffraction data confirmed the phase homogeneity of Y2.5Ce0.5Fe2.5Ga2.5O12 and the absence of a cerium dioxide impurity. At the same time, on the surface of Y2.5Ce0.5Fe2.5Ga2.5O12 particles, along with Ce3+, there are Ce4+ ions.


Datum: 01.04.2022


Transformations of Imidazolium Ionic Liquids under the Influence of 60Co Gamma Radiation

Abstract

The comparative stability of ionic liquids containing alkyl-substituted imidazolium and phosphonium cations on exposure to gamma radiation (60Co source) under the same conditions has been studied for the first time. It has been shown that when exposed to 60Co gamma radiation (an absorbed dose of up to 550 kGy) in the presence of air oxygen, phosphonium and imidazolium ionic liquids exhibit high radiolytic stability. Under these conditions, the yield of radiolytic products is no more than 1 wt %. At the same time, in contrast to phosphonium ionic liquids, imidazolium ionic liquids undergo radiolytic staining at absorbed doses in the range studied. Based on IR, UV, and 1H NMR spectroscopy and known literature data, an assumption has been made about the most probable mechanisms of transformation of imidazolium cations of an ionic liquid under the influence of gamma radiation.


Datum: 01.04.2022


Synthesis and Hydrodynamic Behavior of Poly(methacryloylamino galactose) Macromolecules

Abstract

Poly(methacryloylamino galactose) has been synthesized by a modified method, which enables one to increase the yield of the polymer substance. Samples and fractions have been studied by molecular hydrodynamics methods. Molecular masses, scaling relations, and data on equilibrium rigidity of macromolecules have been estimated from the hydrodynamic characteristics.


Datum: 01.03.2022


Properties of Solutions of Amphiphilic Diblock and Random Copolymers of 2-Perfluorohexylethyl Methacrylate and 2-Hydroxyethyl Methacrylate and Coatings Based on Them

Abstract

The study addresses the relationship between the structure of solutions of amphiphilic diblock and random copolymers of 2-(perfluorohexyl)ethyl methacrylate and 2-hydroxyethyl methacrylate in mixed solvents and water contact angles of the surfaces treated with these solutions. For the first time, the solubility and the structuring of homo- and copolymers in mixed solvents were studied and the regions of molecular solubility and microphase and macrophase separation were determined by light scattering techniques. The structure of thin films formed from various solutions was characterized by transmission electron microscopy.


Datum: 01.03.2022


High-Frequency Electron Transport under Pulsed Mechanical Action on Polypropylene–Graphene Nanoplates Composite

Abstract

A phenomenon of change in the frequency of a mechanically activated current was detected for the first time. This phenomenon consists in the fact that electric current pulses produced by a rheological explosion differ in frequency characteristics between a polypropylene‑graphene nanoplates composite and the matrix polymer (polypropylene). It was shown that the Fourier transforms of the current signals from the composite according to the Havriliak–Negami model for the experimental frequency dependence of conductivity agree well with the results of the calculation using the Drude model for multilayer graphene.


Datum: 01.02.2022


Effect of Temperature on the Electrorheological Behavior of Porous Chitosan Particles in Polydimethylsiloxane

Abstract

The rheological behavior of a 1 wt % suspension of highly porous chitosan particles in polydimethylsiloxane in a high electric field has been studied as a function of temperature. The static and dynamic yield stress in an electric field were found to slightly change with a change in shape of the flow curves. The effective response of the electrorheological fluid decreases with increasing temperature. There is a correlation between the electrophysical characteristics of the suspension and its rheological behavior.


Datum: 01.02.2022


Effect of Titanium Doping of Lithium-Rich Cathode Materials

Abstract

The influence of Ti doping on the functional properties of the lithium-rich Li1.2(Mn0.67Ni0.17Co0.15Ti0.02)0.8O2 cathode material for lithium-ion batteries was studied. The oxide was synthesized by co-precipitation of the appropriate carbonate precursor followed by a solid-state reaction. Doping 2 at % titanium in the transition metal sites increased the material energy and improved its cycling performance. Evidence in favor of positive doping effect on the kinetics of the processes occurring in the cathode material during cycling was obtained.


Datum: 01.01.2022


Thermodynamic Functions of Europium Hafnate at 0–1300 K and Schottky Anomaly

Abstract

The molar heat capacity of europium hafnate at low temperatures (4–345 K) was determined for the first time. The contribution of the Schottky anomaly to the heat capacity was estimated and thermodynamic functions in the range of 0–1300 K were calculated.


Datum: 01.01.2022


Atomistic Calculation of the Melting Point of the High-Entropy Cantor Alloy CoCrFeMnNi

Abstract

The melting point of the high-entropy Cantor alloy CoCrFeMnNi was calculated by the classical molecular dynamics method. Interatomic potential as a set of artificial neural networks was used for simulation of this type for the first time. Neural network coefficients were optimized using machine learning technique with ab initio molecular dynamics data. Ab initio molecular dynamics simulation was carried out for a wide temperature range using the same initial crystalline state. The initial state for ab initio simulations was a special quasi-random structure optimized on pairs of the nearest neighbors. The two-phase method based on the movement of phase boundary in a crystal–melt system was used to calculate the melting point. It should be noted that, although the training set did not contain explicit two-phase configurations, the computed melting point proved to be in a satisfactory agreement with available experimental data. Thus, the melting point of the high-entropy CoCrFeMnNi alloy was calculated without the use of empirical data.


Datum: 01.01.2022


Vaporization Thermodynamics of GeO2 by High-Temperature Mass Spectrometry

Abstract

Vaporization of GeO2 (tetragonal and hexagonal) have been studied by the Knudsen effusion method in combination with mass spectrometry in the temperature range 1250–1370 K. It has been demonstrated that the saturated vapor over GeO2 consists of GeO and O2 molecules. Partial pressures of the equilibrium vapor components and their temperature dependences have been determined. The standard enthalpy of the heterogeneous reaction GeO2(s) = GeO(g) + 1/2O2(g) and the standard enthalpy of formation of GeO2 (∆fH \(_{{298}}^{^\circ }\) (GeO(g)) = −41.7 ± 17.6 kJ mol–1) have been determined by the second- and third-law calculations.


Datum: 01.12.2021


Fracture Pressure in Microdefects of Consolidated Materials

Abstract

The effect of the internal pressure of the gas in a pore or a cracklike defect on the critical fracture stress has been studied using fracture mechanics approaches. An analytical expression was derived for the dependence of the critical fracture stress on the internal pressure in the crack. The results of this work can be used in powder metallurgy and additive manufacturing of novel materials.


Datum: 01.11.2021


Preparation and Study of Properties of a New Biocomposite of Chitosan with 5,7-Bis(1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl)-8-hydroxyquinoline

Abstract

A new bioorganic composite was obtained by impregnation of 5,7-bis(1-hydroxy-1-trifluoromethyl-2,2,2-trifluoroethyl)-8-hydroxyquinoline (FOQ) into chitosan in 60% acetic acid. The resulting complex was found to be highly stable due to hydrogen bonding between the amino groups of chitosan and the highly acidic OH groups of FOQ. This composite inhibited the growth of gram-positive and gram-negative bacteria to a much greater extent than pristine chitosan. It is expected that the biocomposite would be used as an antibacterial coating with a prolonged service life for collagen matrices used for cardiac prostheses.


Datum: 01.11.2021


High-Temperature Thermal Conductivity of Thulium Orthovanadate

Abstract

Thulium orthovanadate-based ceramic materials have been synthesized by solid-phase sintering. Their phase and elemental compositions have been studied. The thermophysical properties of TmVO4 at high temperatures have been studied experimentally. The thermal diffusivity of TmVO4-based ceramics has been measured for the first time by the laser flash method. From these data and heat capacities measured by the DSC method, the thermal conductivity of TmVO4 has been determined.


Datum: 01.10.2021


Heat Capacity and Thermodynamic Functions of the Lu2O3 ⋅ 2HfO2 Solid Solution

Abstract

The molar heat capacity of the Lu2O3 ⋅ 2HfO2 solid solution has been determined at 4.5–347 K, and its thermodynamic functions have been calculated in the range 0–1300 K.


Datum: 01.10.2021


Sulfonated Films of Polyphenylquinoxaline. Preparation and Properties

Abstract

A promising method was proposed for the sulfonation of polyphenylquinoxaline films with sulfuric acid. The sulfonation in the films was confirmed by X-ray photoelectron and IR spectroscopies. The thermal characteristics and dielectric properties of the sulfonated films were studied.


Datum: 01.10.2021


Effect of Surface Modification of Nanoparticles on the Mechanical Properties of Highly Crosslinked Epoxy Nanocomposites: Mesoscopic Simulation

Abstract

A mesoscopic model of a nanocomposite based on crosslinked polymer networks with embedded clay nanoparticles was developed. The model makes it possible to predict the main trends in changes in the mechanical properties of systems, taking into account the degree of crosslinking of nanoparticles with a polymer matrix. The performed simulations showed that modified nanoparticles can significantly improve the Young’s modulus of the nanocomposite compared to the unfilled polymer. It was also shown that the average value of the number of load-bearing chains determines the mechanical response of the coarse-grained model of the polymer system.


Datum: 01.09.2021


Condensed Products of Combustion of Boron-Based Solid Propellants

Abstract

Condensed combustion products of model propellants based on aluminum boride in the combustion chamber of the gas generator of a ducted rocket engine have been studied. The mass fraction of the condensed combustion products, their chemical composition, and their particle size distribution have been determined. It has been demonstrated that the condensed combustion products mainly contain boron compounds with carbon, nitrogen, and oxygen, and it is in this form that boron enters the secondary combustion chamber of the ducted rocket engine. The mass fraction of elemental boron in the condensed combustion products does not exceed 15% and decreases with increasing pressure. It has been found that, regardless of the types and contents of the major components of the model propellants, there are no large (more than 100 μm in size) particle conglomerates at the outlet of the gas-generator nozzle. A comparison of the experimental data with the results of thermodynamic calculations indicates that the calculation methods should be corrected for the nonequilibrium of the combustion products.


Datum: 01.09.2021


Effect of Low Temperatures and Moisture on the Strength Performance of Carbon Fiber Reinforced Plastic

Abstract

The service life of a carbon fiber reinforced plastic used in an aircraft intended for operation under Arctic extreme conditions was studied by longitudinal bend testing in which monotonic loading at various speeds of displacement of the mobile gripper of a testing machine was combined with cyclic loading of specimens with increasing displacement range. The force dependences of the activation energy of failure and the dependences between the failure rate, deformation rate, and service life were characterized. Exposure of the carbon fiber reinforced plastic to subfreezing temperatures was shown to hardly affect the service life. However, periodic transitions through the crystallization temperature of water accumulated in the composite significantly impair its strength performance and safe service life.


Datum: 01.09.2021


Erratum to: Rapid Conversion of Methane to Hydrogen Stimulated by Microwave Irradiation on the Surface of a Carbon Adsorbent

An Erratum to this paper has been published: https://doi.org/10.1134/S0012501621390019


Datum: 01.08.2021


Erratum to: Scalable One-Step Electrochemical Synthesis of a Graphene-Based Material with Controlled Morphology

An Erratum to this paper has been published: https://doi.org/10.1134/S0012501621390020


Datum: 01.08.2021


 


Category: Current Chemistry Research

Last update: 28.03.2018.






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