Article
Chemistry, Physical
Qingshan Liu, Haoqi Dai, Hongyun Chi, Ketian Shi, Qige Zheng, Yanxia Qi
Summary: This paper investigates the density and dynamic viscosity of three dilute solutions at different temperature and solute concentration ranges. The results show that the density and dynamic viscosity of the solutions are affected by temperature and solute concentration. By analyzing the solutions, the relevant parameters of density and viscosity are obtained, and the interactions between solute and solvent as well as between solute and solute are discussed.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Environmental
Muhammad Nisar, Franciele L. Bernard, Evandro Duarte, V. V. Chaban, Sandra Einloft
Summary: The study developed an effective solvent-free CO2 adsorbent by encapsulating IL with metal oxides in polysulfone microcapsules, leading to enhanced CO2 sorption capacity for industrial applications.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Chemistry, Physical
Yoshihiro Koyama, Seiya Shimono, Hiroaki Kishimura, Takahiro Takekiyo, Yukihiro Yoshimura, Hiroshi Abe, Kiyoto Matsuishi
Summary: The high-pressure crystal polymorph of a fluorinated ionic liquid was determined through X-ray diffraction and Raman spectroscopy, revealing irreversible changes in crystal structure upon compression and decompression. Conformational variance/invariance of the ions in the Raman spectra corresponded to the high-pressure crystal polymorph, indicating a switch in conformational variance at a specific pressure point leading to a change in crystal system. The high-pressure crystal polymorph was shown to be entirely different from the low-temperature crystal polymorph.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Chemical
Melek Sekerci-Cetin, Omer Baris Emek, Emine Elif Yildiz, Betul Unlusu
Summary: This article presents the mutual diffusion coefficients of a carbon dioxide-ionic liquid system at different temperatures and pressures. The diffusion coefficients were estimated by conducting experiments and fitting a transport model to the data. The study found that during the process of carbon dioxide dissolution in the ionic liquid, the position of the liquid-vapor interface and the density of the liquid phase changed. The results were compared with literature values and correlations.
CANADIAN JOURNAL OF CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Shahid Hussain, Haifeng Dong, Yanqiang Zhang, Guoxiong Zhan, Shaojuan Zeng, Huifang Duan, Xiangping Zhang
Summary: The study enhanced the CO2/CH4 selectivity performance of zeolitic imidazolate framework (ZIF-8) by impregnating 1-n-butyl-3-methylimidazolium dicyanide [BMIM][DCA], resulting in higher selectivity results reported. The research suggested that IL-impregnated ZIF-8 composite has the potential to address environmental challenges with its improved acid gas separation performance.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Chemistry, Physical
Emily Smith, Neal Fairley, Peter Licence, Robert Jones, Jonas Baltrusaitis
Summary: X-ray photoelectron spectroscopy (XPS) is commonly used for surface characterization. This study presents a refined fitting procedure for XPS spectra, which can account for the asymmetric features observed in experimental spectral envelopes.
APPLIED SURFACE SCIENCE
(2023)
Article
Energy & Fuels
Sami-ullah Rather, Hisham S. Bamufleh, Hesham Alhumade, Usman Saeed, Aqeel Ahmad Taimoor, Aliyu Adebayo Sulaimon, Walid M. Alalayah, Azmi Mohd Shariff
Summary: The high levels of anthropogenic CO2 in the atmosphere causing global warming and erratic weather conditions need urgent attention. An ionic liquid, [C(4)mim][CH3SO3], was chosen for CO2 capture due to its unique characteristics. The COSMO-RS model was used to study the interaction between the IL and CO2. The study provides a detailed overview of the theoretical and experimental aspects of IL's CO2 capture.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2023)
Article
Chemistry, Physical
V. A. Elterman, P. Yu Shevelin, L. A. Yolshina, E. G. Vovkotrub, A. Borozdin
Summary: The transport numbers of [BMIm](+) cation in the ionic liquid are independent of the mole fraction of aluminium chloride, with internal and external transport numbers being 0.70 +/- 0.01 and 1.02 +/- 0.04, respectively. The mobility of AlCl4- and Cl- in the ionic liquid was found to be similar, and the cation size did not affect the transport numbers in the chloroaluminate ionic liquids.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
A. M. Dunaev, V. B. Motalov, L. S. Kudin, Yu. A. Zhabanov, V. V. Aleksandriiskii, Dmitrii Govorov
Summary: The thermodynamic properties of evaporation of 1-butyl-3-methylimidazolium tetrafluoroborate (BMImBF(4)) ionic liquid were investigated using Knudsen effusion mass spectrometry. The results showed that at non-equilibrium Langmuir conditions, the IL evaporates primarily in the form of neutral ion pairs (NIPs), while under equilibrium conditions, decomposition products dominate the vapor. The main decomposition products were found to be substituted imidazole-2-ylidene and hydrofluoric acid. The vaporization enthalpy and formation enthalpy of NIPs were determined, and it was demonstrated that the system is characterized by partial equilibrium.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Polymer Science
Yuhui Xie, Xue Lv, Xinyi Sui, Song Tian, Li'an Jiang, Shulin Sun
Summary: Physicochemical double cross-linking nanocomposite hydrogels were prepared in this study. The addition of ionic liquid prevented Laponite from forming a high thixotropic gel in water. The dispersed Laponite nanosheets acted as dynamic physical crosslinking sites and formed a strong and tough hydrogel network structure when combined with the chemical crosslinking center of MBA in the polymer chain segments. The PAM/Laponite/IL nanocomposite hydrogel showed excellent tensile strength, high tensile strain, and remarkable toughness, making it a potential load-bearing material.
Article
Thermodynamics
Sowjanya Prathipati, Srinivasa Rao Vipparla, Srinivasa Reddy Munnangi, Md Nayeem Sk, Hari Babu Bollikolla
Summary: This study involved the determination of physical parameters and properties of [Bmim][PF6] / N-methylpyrrolidone and their mixtures at various compositions and temperatures. The results indicated strong intermolecular interactions, which increased with temperature. The findings were supported by the Prigogine-Flory-Patterson theory and IR spectra.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2021)
Article
Chemistry, Physical
S. Maryam Ghorbani, Mohammad Reza Housaindokht, Mohammad Reza Bozorgmehr
Summary: The study showed that ionic liquids, specifically [BMIM][Br] and [BMIM][MeSO4], have different effects on the structure and function of Chloroperoxidase (CPO) depending on their concentrations. Low concentrations maintain enzyme activity while high concentrations alter enzyme structure and reduce flexibility of residues. The influence of [BMIM][MeSO4] on CPO structure is noted to be greater due to the unique structure of its corresponding anion group. Additionally, the number of cavities in the enzyme structure explains the activation and deactivation of the enzyme at different ionic liquid concentrations.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Thermodynamics
Yicang Guo, Fengming Shi, Qipeng Shu, Xiaoyong Yue, Cheng Wang, Lei Tao, Jinlong Li
Summary: This study experimentally determined the liquid-liquid equilibrium data for several ionic liquids and their mixtures, showing improved separation performance compared to traditional sulfolane solvent. The selected ionic liquids exhibited higher molar distribution coefficient or selectivity, suggesting they could be potential substitutes for sulfolane in industrial applications.
FLUID PHASE EQUILIBRIA
(2021)
Article
Chemistry, Physical
V. A. Elterman, P. Yu. Shevelin, L. A. Yolshina, A. V. Borozdin
Summary: The density, viscosity, and specific conductivity of AlCl3-[EMIm]Cl and AlCl3-[BMIm]Cl ILs were measured, and the molar concentrations of ions were calculated. The study confirmed the additivity of densities and molar volumes and identified the main factors affecting specific conductivity in acidic ILs.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Biochemistry & Molecular Biology
Artyom Belesov, Natalya Shkaeva, Mark S. Popov, Tatyana E. Skrebets, Anna Faleva, Nikolay Ul'yanovskii, Dmitry S. Kosyakov
Summary: This study comprehensively characterized the degradation products of lignocellulosic biomass solvents using various analytical techniques. It identified a range of volatile and non-volatile products and found that the accumulation of these products affects the physicochemical properties and thermal stability of the solvents, leading to a decrease in decomposition temperature, changes in thermogravimetric curve shape, and the formation of carbon residue during pyrolysis.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Electrochemistry
Mikhail A. Vorotyntsev, Vladimir M. Volgin, Alexey D. Davydov
Summary: Theoretical analysis of the electroreduction process of electrochemically inactive halate-anion on a rotating disk electrode in acidic medium has been performed. The analysis reveals that under certain conditions, a large current density can be achieved despite the electrochemical inactivity of the species involved, which is important for the application of this reaction in high energy density flow batteries.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Multidisciplinary
Alexander S. Zyubin, Tatyana S. Zyubina, Olga I. Istakova, Nataliia Talagaeva, Ekaterina Zolotukhina, Mikhail A. Vorotyntsev, Dmitry Konev
Summary: The conformational change of polypyrrole (PPy) chain in response to interaction with incorporated counterions was modeled using quantum chemical approach. The reorientation of pyrrole rings closest to the anion was found to be energetically favorable, leading to the formation of meanders. The structuring effect of polymer chain in the presence of anions explains the broadening of the electroactivity potential region and the conductive state of polypyrrole film.
JOURNAL OF THE CHINESE CHEMICAL SOCIETY
(2023)
Article
Biochemistry & Molecular Biology
Dmitry Konev, Olga I. Istakova, Evgeny A. Ruban, Artem T. Glazkov, Mikhail A. Vorotyntsev
Summary: This study demonstrates that the direct electroreduction of chlorate can be catalyzed by intermediate products, resulting in high energy conversion efficiency. Chlorine dioxide is identified as the key intermediate product, and its fraction in the electrolyte solution gradually increases and then decreases during the reaction. The Faradaic yield in most experiments exceeds 90%, providing approximately 48% energy conversion efficiency.
Article
Electrochemistry
P. A. Zader, D. Konev, J. Gun, O. Lev, M. A. Vorotyntsev
Summary: The article discusses the variations of the indicator electrode potential and the equilibrium composition of the aqueous solution under zero current conditions in a model electrolytic cell. Five different hypotheses are analyzed regarding the depth of electrolysis and the nature of the processes occurring, with predictions made about the relationship between the redox charge of the system and the indicator electrode potential. Experimental approaches for determining the evolution of the composition of the solution during electrolysis are proposed.
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Roman Pichugov, Dmitry Konev, Ivan Speshilov, Lilia Abunaeva, Mikhail Petrov, Mikhail Alexeevich Vorotyntsev
Summary: In this study, we measured the ring collection coefficient of bromide anion oxidation products in a neutral and slightly alkaline medium using a rotating ring-disk electrode. We varied several parameters and analyzed the results by comparing them with cyclic voltammetry data. The study provides quantitative and qualitative information on the electrooxidation of bromide ions in neutral and alkaline solutions.
Article
Biochemistry & Molecular Biology
Dmitry V. Konev, Olga I. Istakova, Mikhail A. Vorotyntsev
Summary: This study proposes a novel method for rapid determination of principal transmembrane transport parameters for solute electroactive co-ions/molecules. By conducting direct measurements of current for the electrode under different regimes, and comparing theoretical predictions with experimental data for the Br-2/Br- redox couple, the diffusion coefficients and distribution coefficients were successfully determined.
Article
Chemistry, Multidisciplinary
Mikhail S. Belousov, Yusuke Okada, Nagao Kobayashi, Alexander G. Martynov, Margaret A. Gradova, Dmitry V. Konev, Olga A. Goncharova, Viktor A. Tafeenko, Tatiana V. Dubinina
Summary: The first examples of planar binuclear phthalocyanines sharing a common carbazole unit were synthesized using indirect and direct mixed cyclization approaches. The synthetic route to the starting material, 9-benzylcarbazole-2,3,6,7-tetranitrile, was optimized. In addition, a low-symmetry A3B phthalocyanine with free cyano groups was isolated. The ability of singlet oxygen generation in the target binuclear complexes was demonstrated, and the products of photodegradation were studied.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2023)
Article
Chemistry, Physical
Pavel Loktionov, Dmitry Konev, Roman Pichugov, Mikhail Petrov, Anatoly Antipov
Summary: An operando coulometric analysis method for assessing vanadium redox flow battery (VRFB) electrolyte is proposed, which detects the overall vanadium content and average oxidation state (AOS), and performs stably under imbalance conditions.
JOURNAL OF POWER SOURCES
(2023)
Article
Electrochemistry
P. A. Zader, D. V. Konev, M. A. Vorotyntsev
Summary: This study analyzes the relationship between the (quasi)equilibrium composition of aqueous solutions of Cl-containing species, the indicator-electrode potential, and the mean oxidation degree of Cl atoms. Theoretical analysis is conducted for different rates of redox reactions between components, and the results demonstrate a strong dependence on solution acidity. The obtained results can be applied in the analysis of solution composition during electrolysis and for modeling redox-mediator processes involving chlorine oxo compounds.
RUSSIAN JOURNAL OF ELECTROCHEMISTRY
(2022)
Article
Biochemistry & Molecular Biology
Artem Glazkov, Roman Pichugov, Pavel Loktionov, Dmitry Konev, Dmitry Tolstel, Mikhail Petrov, Anatoly Antipov, Mikhail A. Vorotyntsev
Summary: Shunting currents are a major problem in all-vanadium redox flow battery stacks, leading to electrode and bipolar plate degradation. By adjusting the resistance of the electrolyte supply channels, both the shunting currents and their destructive effects can be reduced during battery development. This paper verifies a current distribution model in an all-vanadium redox flow battery stack and determines the capacity fade associated with vanadium compound crossover through direct measurements.
Article
Biochemistry & Molecular Biology
Natalia V. Kartashova, Dmitry V. Konev, Pavel A. Loktionov, Artem T. Glazkov, Olga A. Goncharova, Mikhail M. Petrov, Anatoly E. Antipov, Mikhail A. Vorotyntsev
Summary: The hydrogen-bromate flow battery is a promising hybrid power source that can function as a rechargeable power source under strongly acidic conditions. This study demonstrates the cyclic operation of the battery through a series of charge and discharge stages, with measurements of various performance indicators.
Article
Chemistry, Physical
Roman Pichugov, Pavel Loktionov, Alla Pustovalova, Artem Glazkov, Aleksei Grishko, Dmitry Konev, Mikhail Petrov, Andrey Usenko, Anatoly Antipov
Summary: One of the major challenges in VRFB is the gradual decrease of available capacity over time. The capacity fade is a complex issue affecting the volume, total content, and average valence of vanadium ions. Intermittent mixing of electrolytes and optimizing electrolysis conditions can restore the initial performance parameters regardless of the magnitude of capacity drop.
JOURNAL OF POWER SOURCES
(2023)
Article
Biochemistry & Molecular Biology
Dmitry V. Konev, Pavel A. Zader, Mikhail A. Vorotyntsev
Summary: The passage of cathodic current through the acidized aqueous bromate solution leads to a negative shift in the average oxidation degree of bromine atoms, which undergoes multiple transformations via protonation/deprotonation, chemical, and redox/electrochemical steps. The composition of the catholyte, including the proton concentration and concentrations of various components, is analyzed under different conditions. It is found that the pH value reaches a maximum when the redox capacity of the catholyte is exhausted, with the height and the average oxidation state of bromine atoms depending on the initial bromate/acid ratio.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)