Russian Journal of Physical Chemistry A最新文献_第3页

Thermochemistry of the Dissolution of Copper Tetra-3-carboxyphtalocyanine in Aqueous Solutions of KOH at 298.15 K 298.15 K 时四-3-羧基酞菁铜在 KOH 水溶液中的溶解热化学过程

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-09-11 DOI: 10.1134/s0036024424701371

P. D. Krutov, V. E. Maizlish, O. N. Krutova, V. V. Chernikov, M. I. Bazanov, E. E. Kiptikova

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Characterization and Electrochemical Properties of Carbon Decorated Li3V2(PO4)3 Prepared by Citric Acid Assisted Gel and Heat Treating 柠檬酸辅助凝胶和热处理制备的碳装饰 Li3V2(PO4)3 的表征和电化学性质

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-09-11 DOI: 10.1134/s003602442470153x

Jiakun Luo, Shihao Peng, Jingfeng Guo, Fang Xie, Zhaogang Zhang, Wenwen Liu

{"title":"Characterization and Electrochemical Properties of Carbon Decorated Li3V2(PO4)3 Prepared by Citric Acid Assisted Gel and Heat Treating","authors":"Jiakun Luo, Shihao Peng, Jingfeng Guo, Fang Xie, Zhaogang Zhang, Wenwen Liu","doi":"10.1134/s003602442470153x","DOIUrl":"https://doi.org/10.1134/s003602442470153x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>Li3V2(PO4)3 (LVP) is a prospective cathode material meeting the uninterrupted requirements due to the high theoretical capacity and operating voltage. Nevertheless, the electrochemical capability of pristine LVP is severely restricted under a high operating voltage. Herein, carbon decorated LVP was prepared through the process of citric acid assisted gel and subsequent heat treating. The crystalline phase, morphology, microstructure, and composition of obtained materials were examined using different methods. Transmission electron microscopy result exhibits that the crystalline LVP surface is coated with an amorphous carbon layer of about 3–5 nm thickness, and the LVP particles are connected by carbon. The electrochemical capability of LVP cathode at a cut-off voltage of 4.8 V was determined. The results exhibit the discharge capacity of carbon decorated LVP at 1 C decreases slowly from the initial 132.0 to 104.1 mA h g–1 after 200 cycles. Correspondingly, the carbon decorated LVP delivers 78.9% capacity retention, which is much larger than that of pristine LVP (46.6%), suggesting the enhanced stability. In addition, the rate and Coulombic efficiency of carbon decorated LVP are also obviously enhanced compared to the pristine LVP. The work verifies a simple modification method to ameliorate the inherent drawbacks and electrochemical properties of LVP at high voltage.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142197381","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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Loading Properties of Capillary Porous-Layer Columns of Different Diameters with a Silica Gel Sorbent 不同直径的毛细管多孔层柱与硅胶吸附剂的负载特性

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-09-11 DOI: 10.1134/s0036024424701504

Yu. V. Patrushev, Zh. Kh. Khamidov

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Statistical Thermodynamic Analysis of the Effect of Chemical Composition on Changes in the Melting Temperatures of Alkali Metal Halides 化学成分对碱金属卤化物熔化温度变化影响的统计热力学分析

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-09-11 DOI: 10.1134/s0036024424701322

A. G. Davydov

{"title":"Statistical Thermodynamic Analysis of the Effect of Chemical Composition on Changes in the Melting Temperatures of Alkali Metal Halides","authors":"A. G. Davydov","doi":"10.1134/s0036024424701322","DOIUrl":"https://doi.org/10.1134/s0036024424701322","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>An interpretation is proposed for the dependence of the melting temperatures of an entire subclass of alkali metal halides on the chemical composition, based on an analysis of changes in different contributions to the internal energy of salts in the molten and crystalline phases with variation in the sum of the radii of their cations and anions. The expression for calculating the energy of liquid salt melts includes the contribution from charge–dipole interactions between ions, which is considered in a work based on thermodynamic perturbation theory with a basis in the form of a model of charged hard spheres. The Born–Mayer formula is used for the energy of the crystalline phase in the electrostatic part, while Debye’s formula is employed to consider the contribution from vibrations. An explanation is given for the lower values of the reduced melting temperatures of lithium and sodium halides, relative to other salts. It is shown that deviations of the reduced melting temperatures of lithium and sodium halides depending on the sum of ionic radii can be explained by Coulomb and translational contributions to the energy in the molten state, along with Madelung and Born contributions in the crystalline phase.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142225113","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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Conductometric Properties and UV–Vis Spectroscopic Study of L-Glutamic Acid in Aqueous Solutions of L-Arabinose and D-Xylose in the Temperature Range of 293.15–313.15 K at Atmospheric Pressure 常压下 293.15-313.15 K 温度范围内 L-阿拉伯糖和 D-木糖水溶液中 L-谷氨酸的电导率特性和紫外可见光谱研究

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-09-11 DOI: 10.1134/s0036024424701425

Rupesh Kumar Pradhan, Sulochana Singh

{"title":"Conductometric Properties and UV–Vis Spectroscopic Study of L-Glutamic Acid in Aqueous Solutions of L-Arabinose and D-Xylose in the Temperature Range of 293.15–313.15 K at Atmospheric Pressure","authors":"Rupesh Kumar Pradhan, Sulochana Singh","doi":"10.1134/s0036024424701425","DOIUrl":"https://doi.org/10.1134/s0036024424701425","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>In this work, the electrical conductance approach is used to investigate the molecular interactions between nonessential amino acid (L-glutamic acid) and carbohydrates (L-arabinose/D-xylose) at various temperatures. Many characteristics, including limiting molar conductance (({{Lambda }}_{{text{m}}}^{0})), Walden product (({{Lambda }}_{{text{m}}}^{0}{{eta }_{0}})), activation energy (({{E}_{{text{A}}}})), and thermodynamic parameters, were obtained for the binary and ternary solutions of L-glutamic acid (Glu) from the electrical conductance ((hat {k})) measurement. The acquired thermodynamic quantities were interpreted in terms of the systems’ physicochemical interactions. The behavior of small biomolecules (amino acid) and saccharides in solute-solvent interactions is shown by the influence of numerous parameters, including concentration, temperature, and the position of axial and equatorial –OH groups of the saccharides, on these quantities. Hydrophilic-hydrophilic or ion-hydrophilic interactions predominate in the systems that are being studied is supported by the UV–Vis spectroscopy investigations’ absorption values.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142197373","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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Relationship between Coefficients of Activity and Dielectric Constants in Aqueous Solutions of Alkali Metal Fluorides 碱金属氟化物水溶液中活性系数与介电常数之间的关系

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-09-11 DOI: 10.1134/s0036024424701383

I. Yu. Shilov, A. K. Lyashchenko

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Effect of Support Structure on the Activity of Cr-Containing Catalysts in Propane Dehydrogenation Involving CO2 支撑结构对含铬催化剂在涉及二氧化碳的丙烷脱氢过程中活性的影响

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-09-11 DOI: 10.1134/s0036024424701358

M. A. Tedeeva, M. Yu. Mashkin, E. M. Kuprikova, P. V. Pribytkov, K. B. Kalmykov, A. V. Leonov, N. A. Davshan, S. F. Dunaev, A. L. Kustov

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Effect of Magnetite on Compressive Strength of Concrete and Its Mechanism 磁铁矿对混凝土抗压强度的影响及其机理

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-09-09 DOI: 10.1134/s003602442470122x

Xiaoxin Feng, Weihua Kang, Gang Liu, Ruiying Bai, Yukun An

{"title":"Effect of Magnetite on Compressive Strength of Concrete and Its Mechanism","authors":"Xiaoxin Feng, Weihua Kang, Gang Liu, Ruiying Bai, Yukun An","doi":"10.1134/s003602442470122x","DOIUrl":"https://doi.org/10.1134/s003602442470122x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3>The magnetite ore was taken as the partial aggregate to prepare two types of concrete specimens mixed with magnetite and without magnetite. Both were cured in water and 5 wt % Na2SO4 solution at 20 and 80°C, respectively, to study the influence on the strength of concrete. In addition, the magnetite ore was ground into powder, and cured in simulated concrete pore solution and 5 wt % Na2SO4 solution respectively, and the mineral and morphological change at different ages was tested by X-ray diffraction (XRD) and scanning electron microscope/energy dispersive spectrometer (SEM/EDS). The experimental results show that the strength of concrete with magnetite ore is a little higher than that of concrete without magnetite ore whether cured in water or in Na2SO4 solution, and the magnetite transforms into Fe2O3, ferrihydrite and other minerals in simulated concrete pore solution and in 5 wt % Na2SO4 solution. The experimental results also demonstrate that using some magnetite ore as aggregate for concrete is beneficial for improving the sulfate resistance of concrete.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142197430","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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Mass Spectrometric Study of Evaporation of Hydroxyapatite at Temperatures up to 2200 K 温度高达 2200 K 时羟基磷灰石蒸发的质谱研究

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-09-09 DOI: 10.1134/s0036024424701085

S. I. Lopatin, A. A. Selyutin, V. L. Stolyarova

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Thermodynamic Functions of the Betamethasone Valerate Hormone 戊酸倍他米松激素的热力学函数

IF 0.7 4区化学

Russian Journal of Physical Chemistry A Pub Date : 2024-09-09 DOI: 10.1134/s0036024424700985

A. V. Knyazev, N. N. Smirnova, O. V. Stepanova, S. S. Knyazeva, A. S. Shipilova, S. V. Chuprova

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