Pub Date : 2024-04-21DOI: 10.1134/s0018143924020140
M. Yu. Tashmetov, N. B. Ismatov, S. V. Demidov, S. R. Allayarov
Abstract
The effect of gamma radiation dose on the structure of an ethylene–tetrafluoroethylene copolymer has been studied. The copolymer powder has a triclinic crystal structure with space group P-1 and unit cell parameters of a = 8.84 Å, b = 5.34 Å, c = 4.90 Å, α = 99.11°, β = 85.84°, and γ = 90.89°. The coherent scattering region of the copolymer linearly increases from 4.3 to 6.8 nm with an increase in the absorbed gamma radiation dose to 2000 kGy. The degree of crystallinity of the copolymer decreases by 2.1% after irradiation with a dose of up to 100 kGy; after that, with an increase in the dose to 2000 kGy, the degree of crystallinity increases. The absence of significant changes in the crystal structure parameters of the copolymer after irradiation with a dose of up to 2000 kGy suggests that the copolymer crystal structure is resistant to radiation.
{"title":"Effect of Gamma Radiation Dose on the Crystal Structure of the Ethylene–Tetrafluoroethylene Copolymer","authors":"M. Yu. Tashmetov, N. B. Ismatov, S. V. Demidov, S. R. Allayarov","doi":"10.1134/s0018143924020140","DOIUrl":"https://doi.org/10.1134/s0018143924020140","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The effect of gamma radiation dose on the structure of an ethylene–tetrafluoroethylene copolymer has been studied. The copolymer powder has a triclinic crystal structure with space group <i>P</i>-1 and unit cell parameters of <i>a</i> = 8.84 Å, <i>b</i> = 5.34 Å, <i>c</i> = 4.90 Å, α = 99.11°, β = 85.84°, and γ = 90.89°. The coherent scattering region of the copolymer linearly increases from 4.3 to 6.8 nm with an increase in the absorbed gamma radiation dose to 2000 kGy. The degree of crystallinity of the copolymer decreases by 2.1% after irradiation with a dose of up to 100 kGy; after that, with an increase in the dose to 2000 kGy, the degree of crystallinity increases. The absence of significant changes in the crystal structure parameters of the copolymer after irradiation with a dose of up to 2000 kGy suggests that the copolymer crystal structure is resistant to radiation.</p>","PeriodicalId":12893,"journal":{"name":"High Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140634448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-21DOI: 10.1134/s0018143924020127
T. G. Shikova, I. V. Kholodkov, S. A. Smirnov, B. L. Gorberg, M. O. Makeev, P. A. Mikhalev, A. S. Osipkov
Abstract
Changes in the composition of the surface layer of Nevaflon polyvinylidene fluoride film after treatment in gas discharges of various types (glow, dielectric barrier, corona) have been studied. The influence of the discharge type on the kinetics of etching and surface modification of polyvinylidene fluoride is shown. It has been found that the plasma treatment of polyvinylidene fluoride leads to a change in the modified surface layer of the polymer.
{"title":"Kinetic Features of Plasma-Chemical Modification of Polyvinylidene Fluoride in Plasma","authors":"T. G. Shikova, I. V. Kholodkov, S. A. Smirnov, B. L. Gorberg, M. O. Makeev, P. A. Mikhalev, A. S. Osipkov","doi":"10.1134/s0018143924020127","DOIUrl":"https://doi.org/10.1134/s0018143924020127","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Changes in the composition of the surface layer of Nevaflon polyvinylidene fluoride film after treatment in gas discharges of various types (glow, dielectric barrier, corona) have been studied. The influence of the discharge type on the kinetics of etching and surface modification of polyvinylidene fluoride is shown. It has been found that the plasma treatment of polyvinylidene fluoride leads to a change in the modified surface layer of the polymer.</p>","PeriodicalId":12893,"journal":{"name":"High Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140634201","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chitosan (CS) was selected as the carbon source, and the Chitosan/dicyandiamide (CS/DCDA) precursors with hydrogen bonding interactions were prepared by freeze-drying and normal drying, and the carbon-Chitosan/graphite carbon nitride (C-CS/g-C3N4) composites were obtained after calcination. The results show that the freeze-drying process can produce more hydrogen bonding interaction between chitosan and dicyandiamide (DCDA) and more pores through recrystallization. More composite carbon is formed in the C-CS/g-C3N4-2 composite obtained after calcination. More hydrogen bonds are broken, releasing more N lone pairs of electrons, which not only facilitates the n−π* electron leap, but also facilitates the separation and photogenerated electron-hole, and provides a large number of reactive sites for photocatalytic degradation of pollutants. This results in better photocatalytic performance of C-CS/g-C3N4-2.
摘要 选用壳聚糖（CS）作为碳源，通过冷冻干燥和普通干燥制备了具有氢键作用的壳聚糖/双氰胺（CS/DCDA）前驱体，经煅烧得到了碳-壳聚糖/石墨氮化碳（C-CS/g-C3N4）复合材料。结果表明，冷冻干燥过程能使壳聚糖和双氰胺（DCDA）之间产生更多的氢键作用，并通过再结晶产生更多的孔隙。煅烧后得到的 C-CS/g-C3N4-2 复合材料中形成了更多的复合碳。更多的氢键被打破，释放出更多的 N 孤对电子，不仅有利于 n-π* 电子的跃迁，也有利于电子-空穴的分离和光生，为污染物的光催化降解提供了大量的反应位点。因此，C-CS/g-C3N4-2 具有更好的光催化性能。
{"title":"Effect of Freeze-Dried Chitosan/Dicyandiamide on the Structure and Photocatalytic Performance of C-CS/g-C3N4","authors":"Qingbo Yu, Zishe Xu, Dapeng Zhou, Xinxin Ren, Xianhua Li, Fengtao Lin, Qingping Wang","doi":"10.1134/s0018143924020085","DOIUrl":"https://doi.org/10.1134/s0018143924020085","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Chitosan (CS) was selected as the carbon source, and the Chitosan/dicyandiamide (CS/DCDA) precursors with hydrogen bonding interactions were prepared by freeze-drying and normal drying, and the carbon-Chitosan/graphite carbon nitride (C-CS/g-C<sub>3</sub>N<sub>4</sub>) composites were obtained after calcination. The results show that the freeze-drying process can produce more hydrogen bonding interaction between chitosan and dicyandiamide (DCDA) and more pores through recrystallization. More composite carbon is formed in the C-CS/g-C<sub>3</sub>N<sub>4</sub>-2 composite obtained after calcination. More hydrogen bonds are broken, releasing more N lone pairs of electrons, which not only facilitates the <i>n</i>−π* electron leap, but also facilitates the separation and photogenerated electron-hole, and provides a large number of reactive sites for photocatalytic degradation of pollutants. This results in better photocatalytic performance of C-CS/g-C<sub>3</sub>N<sub>4</sub>-2.</p>","PeriodicalId":12893,"journal":{"name":"High Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140634624","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-21DOI: 10.1134/s001814392402005x
Zh. B. Lyutova, M. A. Markova, I. V. Yudin
Abstract
The radiolysis of malondialdehyde (MDA) in acidic (pH 3) and alkaline (pH 11) aqueous solutions has been studied using UV spectrometry, HPLC, and chemical analysis. It has been found that in an acidic medium, the radiation-chemical yield of degradation of MDA at concentrations greater than 3 × 10–4 mol/L exceeds 10 molecule/100 eV, indicating the occurrence of chain processes. It has been established that dissolved oxygen plays an important role in the chain process of MDA decomposition. A system of reactions was proposed to explain the results of the experiments.
{"title":"Radiation-Chemical Decomposition of Malondialdehyde in Aqueous Solutions","authors":"Zh. B. Lyutova, M. A. Markova, I. V. Yudin","doi":"10.1134/s001814392402005x","DOIUrl":"https://doi.org/10.1134/s001814392402005x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The radiolysis of malondialdehyde (MDA) in acidic (pH 3) and alkaline (pH 11) aqueous solutions has been studied using UV spectrometry, HPLC, and chemical analysis. It has been found that in an acidic medium, the radiation-chemical yield of degradation of MDA at concentrations greater than 3 × 10<sup>–4</sup> mol/L exceeds 10 molecule/100 eV, indicating the occurrence of chain processes. It has been established that dissolved oxygen plays an important role in the chain process of MDA decomposition. A system of reactions was proposed to explain the results of the experiments.</p>","PeriodicalId":12893,"journal":{"name":"High Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140634299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-21DOI: 10.1134/s0018143924020152
T. N. Terentev, G. B. Kiselev, A. Yu. Shemakhin, V. S. Zheltukhin
Abstract
The paper is dedicated to the numerical study of the dependence of plasma antenna resonance wavelengths on pressure. The study was carried out by simulating a RF capacitively coupled plasma with the Comsol Multiphysics software in one- dimensional formulation. Based on the calculated electric current in the plasma, the directional pattern and axial distribution of the electromagnetic field were found by solving Maxwell’s equations in a 2D formulation. The results showed that one of the advantages of plasma antennas is the transmission of waves at significantly longer wavelengths compared to metal antennas of similar geometry.
{"title":"Influence of Pressure on Plasma Antenna Resonance Wavelength","authors":"T. N. Terentev, G. B. Kiselev, A. Yu. Shemakhin, V. S. Zheltukhin","doi":"10.1134/s0018143924020152","DOIUrl":"https://doi.org/10.1134/s0018143924020152","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The paper is dedicated to the numerical study of the dependence of plasma antenna resonance wavelengths on pressure. The study was carried out by simulating a RF capacitively coupled plasma with the Comsol Multiphysics software in one- dimensional formulation. Based on the calculated electric current in the plasma, the directional pattern and axial distribution of the electromagnetic field were found by solving Maxwell’s equations in a 2D formulation. The results showed that one of the advantages of plasma antennas is the transmission of waves at significantly longer wavelengths compared to metal antennas of similar geometry.</p>","PeriodicalId":12893,"journal":{"name":"High Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140634447","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-21DOI: 10.1134/s0018143924020164
Yinjia Miao, Liankui Xu, Deren Ge, Kai Fan
Abstract
In this paper, the PVDF-g-PAMA membrane was prepared through gamma-ray irradiation in a monomer aqueous solution. The irradiation products’ chemical composition was examined by Fourier transform infrared spectrometer (FTIR) and X-ray photoelectron spectroscopy (XPS), and the spectra confirmed that poly (allyl methacrylate) (PAMA) was successfully grafted onto polyvinylidene fluoride (PVDF) molecular chain to form the PVDF-g-PAMA membrane. The CA of the PVDF-g-PAMA modified membrane was reduced compared with the traditional PVDF membrane, indicating that the hydrophilicity and anti-fouling performance of the membrane had been improved. The output water of domestic sewage treated by the integrated MBR equipment with PVDF-g-PAMA membranes as the core component was stable, and the effluent quality was also improved. After examining the overall costs associated with using PVDF and PVDF-g-PAMA membranes, it was discovered that even though the complicated preparation process for modified PVDF-g-PAMA by gamma-ray irradiation increased the initial cost, its potent anti-fouling capabilities effectively reduced the cost of subsequent operation and maintenance, leading to a significant decrease in overall cost of project.
{"title":"The Radiation Graft Copolymerization of Allylmethacrylate to Polyvinylidene Fluoride to Prepare of Membrane and Its Affordability for Domestic Wastewater Treatment","authors":"Yinjia Miao, Liankui Xu, Deren Ge, Kai Fan","doi":"10.1134/s0018143924020164","DOIUrl":"https://doi.org/10.1134/s0018143924020164","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this paper, the PVDF-g-PAMA membrane was prepared through gamma-ray irradiation in a monomer aqueous solution. The irradiation products’ chemical composition was examined by Fourier transform infrared spectrometer (FTIR) and X-ray photoelectron spectroscopy (XPS), and the spectra confirmed that poly (allyl methacrylate) (PAMA) was successfully grafted onto polyvinylidene fluoride (PVDF) molecular chain to form the PVDF-g-PAMA membrane. The CA of the PVDF-g-PAMA modified membrane was reduced compared with the traditional PVDF membrane, indicating that the hydrophilicity and anti-fouling performance of the membrane had been improved. The output water of domestic sewage treated by the integrated MBR equipment with PVDF-g-PAMA membranes as the core component was stable, and the effluent quality was also improved. After examining the overall costs associated with using PVDF and PVDF-g-PAMA membranes, it was discovered that even though the complicated preparation process for modified PVDF-g-PAMA by gamma-ray irradiation increased the initial cost, its potent anti-fouling capabilities effectively reduced the cost of subsequent operation and maintenance, leading to a significant decrease in overall cost of project.</p>","PeriodicalId":12893,"journal":{"name":"High Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140634202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-27DOI: 10.1134/s0018143923090163
N. I. Sorokin
{"title":"On the Transformation of Avoided Crossing into Crossing at Finite Widths of Two Interacting States","authors":"N. I. Sorokin","doi":"10.1134/s0018143923090163","DOIUrl":"https://doi.org/10.1134/s0018143923090163","url":null,"abstract":"","PeriodicalId":12893,"journal":{"name":"High Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140003177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-27DOI: 10.1134/s001814392309014x
P. A. Purtov
Abstract
Calculations of electron–nuclear alignment (CIDEP multiplet effect) in radicals formed as a result of the photochemical decomposition of molecules have been performed. There is a mutual ordering of spins in the radicals: the electron and nuclear spins in the radical are oriented parallel or antiparallel. The populations of stationary states of radicals in weak magnetic fields have been calculated in the framework of the kinematic approach.
{"title":"Electron–Nuclear Alignment in Radicals Formed by Photochemical Decomposition of Molecules","authors":"P. A. Purtov","doi":"10.1134/s001814392309014x","DOIUrl":"https://doi.org/10.1134/s001814392309014x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Calculations of electron–nuclear alignment (CIDEP multiplet effect) in radicals formed as a result of the photochemical decomposition of molecules have been performed. There is a mutual ordering of spins in the radicals: the electron and nuclear spins in the radical are oriented parallel or antiparallel. The populations of stationary states of radicals in weak magnetic fields have been calculated in the framework of the kinematic approach.</p>","PeriodicalId":12893,"journal":{"name":"High Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140003170","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-27DOI: 10.1134/s0018143923090114
A. V. Nevidimov
Abstract
A quadratic dependence of the charge diffusion coefficient on the diameter of colloidal quantum dots (CQDs) has been established. The charge diffusion coefficient is shown to depend weakly on the polydispersity of a sample. It has been determined that a decrease in the root-mean-square displacement of a charge carrier is an exponential function of the thickness of a ligand shell and the relative fraction of particles that can become charge traps. An explanation has been proposed for the exponential dependence of the conductivity of PbS CQD layers on the CQD size, which consists in a decrease in the fraction of CQDs acting as charge carrier traps.
{"title":"Computer Simulation of Charge Carrier Transport Processes in the Conducting Layers of Colloidal Quantum Dots","authors":"A. V. Nevidimov","doi":"10.1134/s0018143923090114","DOIUrl":"https://doi.org/10.1134/s0018143923090114","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A quadratic dependence of the charge diffusion coefficient on the diameter of colloidal quantum dots (CQDs) has been established. The charge diffusion coefficient is shown to depend weakly on the polydispersity of a sample. It has been determined that a decrease in the root-mean-square displacement of a charge carrier is an exponential function of the thickness of a ligand shell and the relative fraction of particles that can become charge traps. An explanation has been proposed for the exponential dependence of the conductivity of PbS CQD layers on the CQD size, which consists in a decrease in the fraction of CQDs acting as charge carrier traps.</p>","PeriodicalId":12893,"journal":{"name":"High Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-02-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140003281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-02-01DOI: 10.1134/S0018143924010077
A. A. Izvekova, A. Gushchin, P. A. Ivanova, E. Kvitkova, A. A. Ignatiev, V. Rybkin
{"title":"Kinetics of Ibuprofen Degradation in Aqueous Solution by the Action of Dielectric-Barrier Discharge in Oxygen","authors":"A. A. Izvekova, A. Gushchin, P. A. Ivanova, E. Kvitkova, A. A. Ignatiev, V. Rybkin","doi":"10.1134/S0018143924010077","DOIUrl":"https://doi.org/10.1134/S0018143924010077","url":null,"abstract":"","PeriodicalId":12893,"journal":{"name":"High Energy Chemistry","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140467555","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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