Russian Journal of Physical Chemistry A最新文献_第4页

SILP Type Catalyst Based on H3PMo12O40: Composition of Heteropolyanions According to Mass Spectrometry Data and Activity in Oxidation of Sulfur-Containing Substrates 基于 H3PMo12O40 的 SILP 型催化剂：根据质谱数据得出的杂多阳离子组成以及在氧化含硫底物中的活性

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-11-18 DOI: 10.1134/S0036024424701954

I. G. Tarkhanova, I. V. Minenkova, V. S. Gorbunov, V. M. Zelikman, V. G. Krasovskii, K. I. Maslakov, A. K. Buryak

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Lipid Particles as Promising Carriers of Radioactive Pharmaceuticles 有望成为放射性药物载体的脂质颗粒

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-11-18 DOI: 10.1134/S0036024424702108

A. D. Shirokikh, A. A. Fenin, M. Yu. Koroleva

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Using a Laser Plasmatron to Synthesize Diamond Coatings on a Carbide Cutting Tool 使用激光等离子加速器在硬质合金切削工具上合成金刚石涂层

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-11-18 DOI: 10.1134/S0036024424702133

A. F. Glova, I. D. Klochkov, A. Yu. Lysikov, E. D. Radchenko, L. I. Knyazeva, A. N. Kirichenko

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Imide Containing Polymers as Promising Filtration Nonwovens 含亚胺聚合物的过滤无纺布前景广阔

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-11-18 DOI: 10.1134/S0036024424702169

A. S. Nesterova, A. L. Didenko, G. V. Vaganov, A. M. Kamalov, T. S. Anokhina, I. L. Borisov, V. E. Kraft, V. E. Yudin, A. O. Malakhov, V. V. Kudryavtsev

{"title":"Imide Containing Polymers as Promising Filtration Nonwovens","authors":"A. S. Nesterova, A. L. Didenko, G. V. Vaganov, A. M. Kamalov, T. S. Anokhina, I. L. Borisov, V. E. Kraft, V. E. Yudin, A. O. Malakhov, V. V. Kudryavtsev","doi":"10.1134/S0036024424702169","DOIUrl":"10.1134/S0036024424702169","url":null,"abstract":"Nonwoven materials are fashioned from polyimide (PI) and its copolymer derivative (urethane–imide) (CPUI) through the formation of electrical fibers, referred to as electrospinning (ES). Diaminobiphenyl ether (DABPE) and pyromellitic anhydride (PMA) are chosen as monomers in the synthesis of polyimide. Diamine dianhydride and toluene di-isocyanate (TDI) are used in the synthesis of copoly(urethaneimide), as is polycaprolactone (Mn = 2000). A nonwoven polyimide material is obtained from an aqueous–ethanolic solution of the triethylammonium salt of polyamide acid (SPAA) with subsequent thermal imidization of the nonwoven prepolymer at 250°C. A nonwoven material based on SPAA is obtained from a solution of copoly(urethaneamidoacid) in dimethyformamide (DMF) using a catalytic mixture consisting of triethylamine and acetic anhydride. Optimum conditions are selected for the formation of nonwoven fibers in electrospinning. The chemical structure of nonwovens is confirmed via IR spectroscopy. The morphology of the microstructure of nonwovens is studied by means of scanning electron microscopy (SEM). The thermal and mechanical properties of the obtained nonwovens are determined using TGA, DSC, and DMA, and their deformation and strength characteristics are determined. Membrane filtration properties of the obtained nonwovens are studied. It is concluded that nonwovens can be used as membranes that operate in nonaqueous organic media.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 12","pages":"2879 - 2887"},"PeriodicalIF":0.7,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672531","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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New Catalysts for Chemical Isotope Exchange between Water and Carbon Dioxide 水与二氧化碳化学同位素交换的新型催化剂

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-11-18 DOI: 10.1134/S0036024424702157

I. A. Vorakso, A. Yu. Chebotov, I. L. Rastunova, M. B. Rozenkevich

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Stability of Polydecylmethylsiloxane Based Membranes in the Separation of an ABE Fermentation Mixture: The Effect of a Perfluorinated Substituent 聚癸基甲基硅氧烷膜在分离 ABE 发酵混合物中的稳定性：全氟取代基的影响

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-11-18 DOI: 10.1134/S0036024424702121

T. N. Rokhmanka, G. S. Golubev, V. P. Vasilevskii, E. A. Grushevenko

{"title":"Stability of Polydecylmethylsiloxane Based Membranes in the Separation of an ABE Fermentation Mixture: The Effect of a Perfluorinated Substituent","authors":"T. N. Rokhmanka, G. S. Golubev, V. P. Vasilevskii, E. A. Grushevenko","doi":"10.1134/S0036024424702121","DOIUrl":"10.1134/S0036024424702121","url":null,"abstract":"Polydecylmethylsiloxane–polyperfluorooctyl methylsiloxane (PDec-PFOMS) copolymers are synthesized for the first time. NMR data are used to determine the quantitative substitution of the Si–H bond in the PDec-PFOMS. It is shown that raising the content of PFO expands the wetting angle for n-butanol. It is established that injecting the polymer with 2 mol % of PFO increases the sorption of n-butanol by a factor of 1.5. The performance of the obtained composite membranes during the separation of the ABE fermentation mixture is studied for 70 h in the vacuum pervaporation mode. It is established that introducing 2 mol % of PFO substituents raises the total membrane flow from 0.29 kg/(m2 h) to 0.55 kg/(m2 h). After 70 h of separation, the reduction of the total flow through the 2PFO/MFFK membrane is found to be 10% less than that of PDecMS/MFFK. The improved stability of the transport characteristics of 2PFO/MFFK testifies to the advantage of modifying PDecMS by introducing PFO to create a material resistant to clogging when separating alcohols from an ABE-fermentation mixture.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 12","pages":"2855 - 2864"},"PeriodicalIF":0.7,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672586","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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Effective Actinide Ion Charges in AnO2 (An = Th‒Lr) 二氧化锑中的有效锕系元素离子电荷（锑 = Th-Lr）

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-11-18 DOI: 10.1134/S0036024424702005

Yu. A. Teterin, A. E. Putkov, M. V. Ryzhkov, A. Yu. Teterin, K. E. Ivanov, S. N. Kalmykov, V. G. Petrov

{"title":"Effective Actinide Ion Charges in AnO2 (An = Th‒Lr)","authors":"Yu. A. Teterin, A. E. Putkov, M. V. Ryzhkov, A. Yu. Teterin, K. E. Ivanov, S. N. Kalmykov, V. G. Petrov","doi":"10.1134/S0036024424702005","DOIUrl":"10.1134/S0036024424702005","url":null,"abstract":"The electronic structure of AnO2 (An = Th‒Lr) and the structure of X-ray photoelectron spectra of their valence electrons were calculated by the relativistic discrete variation method in the MO LCAO cluster approximation (molecular orbitals as linear combinations of atomic orbitals). This structure is in satisfactory agreement with the available experimental spectra. The effective charges QAn of the An ions in AnO2 were determined as the difference between the number of electrons in the neutral An atom and the number of electrons in the actinide ion in the AnO8 cluster. The dependence of the effective charges QAn in AnO2 on the atomic number Z was obtained. The estimated values in the range 0.42 e < QAn < 1.04 e differ significantly from QAn(IV) = 4 e, found in the ionic approximation. This is attributed to the significant covalence effects in AnO2, associated with the overlap of not only An6d, but also of An6p and An5f AOs with the oxygen orbitals. There is qualitative agreement between the obtained QAn values and the values of the chemical shifts (several electron-volts) of the lines of the actinide 4f core electrons in the XP spectra of dioxides relative to the metals.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 12","pages":"2763 - 2766"},"PeriodicalIF":0.7,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142672535","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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Modification of the Fe/MgAl2O4 Catalyst of CO Hydrogenation with Indium 用铟改性一氧化碳加氢反应的 Fe/MgAl2O4 催化剂

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-10-28 DOI: 10.1134/S0036024424701681

G. V. Pankina, A. N. Kharlanov, P. A. Chernavskii, K. I. Maslakov, A. V. Shumyantsev

引用次数: 0

A Bamboo-structured N-Doped Carbon Nanotubes Encapsulated PdCo Nanoparticles: Synthesis and Catalytic Performance for Furfural Hydrogenation to Furfural Alcohol 包裹钯钴纳米颗粒的竹节结构掺杂 N 碳纳米管：糠醛加氢制糠醛醇的合成与催化性能

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-10-28 DOI: 10.1134/S003602442470170X

Yaqian Gu, Pei Li, Yongyu Huang, Yang Li, Lijun Guo, Hua Song, Cuiqin Li, Feng Li

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Simulation of Lithium Adsorption in 4H–SiC, Electron Transfer, and Thermodynamic Functions of Si–C–Li Compounds 模拟 4H-SiC 中锂的吸附、电子转移以及硅-碳-锂化合物的热力学函数

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-10-28 DOI: 10.1134/S0036024424701607

S. M. Asadov, S. N. Mustafaeva, V. F. Lukichev

{"title":"Simulation of Lithium Adsorption in 4H–SiC, Electron Transfer, and Thermodynamic Functions of Si–C–Li Compounds","authors":"S. M. Asadov, S. N. Mustafaeva, V. F. Lukichev","doi":"10.1134/S0036024424701607","DOIUrl":"10.1134/S0036024424701607","url":null,"abstract":"The adsorption, electronic, and thermodynamic properties of the 2 × 2 × 1 and 3 × 3 × 1 supercells of the binary compounds (({{{text{A}}}_{n}}{{{text{B}}}_{m}} = 4{text{H}}- {text{SiC}},) ({{alpha }}{kern 1pt} {text{ - }}{kern 1pt} {text{L}}{{{text{i}}}_{2}}{{{text{C}}}_{2}},) ({text{L}}{{{text{i}}}_{n}}{text{S}}{{{text{i}}}_{m}})) of the Si–C–Li system were studied using the density functional theory (DFT). The theoretical capacity of the 4H–SiC hexagonal polytype was found to exceed that of graphite (370 mA h/g) used as an anode material for lithium-ion batteries. The crystalline compounds ({{{text{A}}}_{n}}{{{text{B}}}_{m}}) have electronic conductivity. The DFT calculations used the exchange-correlation functional within the framework of the generalized gradient approximation (GGA PBE). The parameters of the crystal structure, the adsorption energy of the ({text{L}}{{{text{i}}}_{{{text{ads}}}}}) adatom on the 4H–SiC substrate, the electronic band structure, and the thermodynamic properties of the supercells of ({{{text{A}}}_{n}}{{{text{B}}}_{m}}) compounds were calculated. The thermodynamically favorable position of ({text{L}}{{{text{i}}}_{{{text{ads}}}}}) and the stable configuration of the 4H–SiC〈Liads〉 supercells were determined. The DFT calculations of the enthalpy of formation of ({{{text{A}}}_{n}}{{{text{B}}}_{m}}) compounds in the Si–C–Li ternary system were performed. The calculated characteristics of ({{{text{A}}}_{n}}{{{text{B}}}_{m}}) agree with the experimental data. The equilibrium connodes in the concentration triangle of Si–C–Li were established using the standard thermodynamic potentials of ({{{text{A}}}_{n}}{{{text{B}}}_{m}}) compounds and the changes in energy in solid-phase exchange reactions between these compounds. An isothermal section of the phase diagram of Si–C–Li at 298 K was constructed.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"98 11","pages":"2437 - 2446"},"PeriodicalIF":0.7,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142524424","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}

引用次数: 0