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    Kinetics and mechanism of BaLaCuS3 oxidation / N. O. Azarapin, N. A. Khritokhin, V. V. Atuchin [et al.] // Crystals. - 2023. - Vol. 13, Is. 6. - Ст. 903, DOI 10.3390/cryst13060903. - Cited References: 65. - The work was partially carried out using the resources of the Research Resource Center “Natural Resources Management and Physico-Chemical Research” (Tyumen University) with financial support from the Ministry of Science and Higher Education of the Russian Federation (contract No. 05.594.21.0019., Unique identification number RFMEFI59420X0019). M.S. Molokeev was supported by the Tyumen Oblast Government, as part of the West-Siberian Interregional Science and Education Center’s project No. 89-DON (3). - The authors would like to thank the staff of the Engineering Center of the Tyumen State University (special Alexej V. Matigorov) for their help in carrying out physical and chemical tests . - ISSN 2073-4352
   Перевод заглавия: Кинетика и механизм окисления BaLaCuS3
Кл.слова (ненормированные):
BaLaCuS3 -- complex sulfide -- oxidation -- kinetic -- XRD analysis
Аннотация: The oxidation reactions of BaLaCuS3 in the artificial air atmosphere were studied at different heating rates in the temperature range of 50–1200 °C. The oxidation stages were determined by DSC-TG, XRD and IR–vis methods. The kinetic characteristics of the proceeding reactions were obtained with the use of the Kissinger model in a linearized form. Compound BaLaCuS3 was stable in the air up to 280 °C. Upon further heating up to 1200 °C, this complex sulfide underwent three main oxidation stages. The first stage is the formation of BaSO4 and CuLaS2. The second stage is the oxidation of CuLaS2 to La2O2SO4 and copper oxides. The third stage is the destruction of La2O2SO4. The final result of the high-temperature treatment in the artificial air atmosphere was a mixture of barium sulfate, copper (II) oxide and La2CuO4. The mechanism and stages of BaLaCuS3 oxidation and further interactions of the components were discussed.

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Держатели документа:
Department of Inorganic and Physical Chemistry, Tyumen State University, Tyumen 625003, Russia
Laboratory of Optical Materials and Structures, Institute of Semiconductor Physics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia
Research and Development Department, Kemerovo State University, Kemerovo 650000, Russia
Department of Industrial Machinery Design, Novosibirsk State Technical University, Novosibirsk 630073, Russia
R&D Center “Advanced Electronic Technologies”, Tomsk State University, Tomsk 634034, Russia
Laboratory for Nanomaterials and Nanoelectronics, Center for Nature-Inspired Engineering, Technology Park, Tyumen State University, Tyumen 625003, Russia
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Laboratory of Theory and Optimization of Chemical and Technological Processes, University of Tyumen, Tyumen 625003, Russia
Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk 660041, Russia
Hybrid Nanodevice Research Group (HNRG), Department of Electrical Engineering, Indian Institute of Technology Indore, Indore 453552, India
Centre for Advanced Electronics (CAE), Indian Institute of Technology Indore, Indore 453552, India
School of Engineering, RMIT University, Melbourne, VIC 3001, Australia
Institute of Solid State Chemistry, UB RAS, Yekaterinburg 620990, Russia

Доп.точки доступа:
Azarapin, N. O.; Khritokhin, N. A.; Atuchin, V. V.; Gubin, A. A.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Mukherjee, S.; Andreev, O. V.
}
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    Thermokinetic study of intermetallic phase formation in an Al/Cu multilayer thin film system / E. T. Moiseenko, V. V. Yumashev, R. R. Altunin [et al.] // Materialia. - 2023. - Vol. 28. - Ст. 101747, DOI 10.1016/j.mtla.2023.101747. - Cited References: 53. - This work was supported by the Russian Science Foundation under grant # 22-13-00313 . - ISSN 2589-1529
   Перевод заглавия: Термокинетическое исследование образования интерметаллических фаз в многослойной тонкопленочной системе Al/Cu
Кл.слова (ненормированные):
Intermetallics -- Thin film -- Solid-state reaction -- Kinetics -- Differential scanning calorimetry -- Electron diffraction
Аннотация: The solid-state reaction process in a multilayer thin film system (Al/Cu)50 has experimentally been studied using the methods of simultaneous thermal analysis (STA) and in situ electron diffraction. A detailed kinetic analysis of the phase formation processes during the solid-state reaction has shown that the observed solid-state transformations can be described by a statistically significant kinetic model where each stage corresponds to the reaction of the n-th order with autocatalysis. The low-temperature stage has been demonstrated to be attributable to the formation of the θ-Al2Cu phase, with the medium-temperature and high-temperature ones corresponding to the α2-AlCu3 and γ1-Al4Cu9 phases, respectively. The kinetic parameters for the formation of the phases θ-Al2Cu, α2-AlCu3 and γ1-Al4Cu9 have been determined. It has been shown that the kinetic model describing the solid-state reaction in the Al–Cu multilayer thin film system is in best agreement with the experimental data in the case of a competition between the formation stages of the α2-AlCu3 and γ1-Al4Cu9 phases.

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Держатели документа:
Siberian Federal University, 660041 79 Svobodny ave., Krasnoyarsk, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Akademgorodok 50/24, 660036 Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Moiseenko, E. T.; Yumashev, V. V.; Altunin, R. R.; Solovyov, L. A.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Belousov, O. V.; Zharkov, S. M.; Жарков, Сергей Михайлович
}
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Biodegradable polyhydroxyalkanoates formed by 3- and 4-hydroxybutyrate monomers to produce nanomembranes suitable for drug delivery and cell culture / T. G. Volova, A. V. Demidenko, A. V. Murueva [et al.] // Technologies. - 2023. - Vol. 11, Is. 4. - Ст. 106, DOI 10.3390/technologies11040106. - Cited References: 116. - his research was funded by State Assignment of the Ministry of Science and Higher Education of the Russian Federation (project No. 0287-2021-0025) . - ISSN 2227-7080
Кл.слова (ненормированные):
degradable polyhydroxyalkanoates -- copolymers P(3HB-co-4HB) -- electrostatic molding -- membranes -- microstructure and properties -- drugs -- release kinetics -- antibacterial activity -- fibroblast proliferation
Аннотация: Biodegradable polyhydroxyalkanoates, biopolymers of microbiological origin, formed by 3- and 4-hydroxybutyrate monomers P(3HB-co-4HB), were used to obtain nanomembranes loaded with drugs as cell carriers by electrospinning. Resorbable non-woven membranes from P(3HB-co-4HB) loaded with ceftazidime, doripinem, and actovegin have been obtained. The loading of membranes with drugs differently affected the size of fibers and the structure of membranes, and in all cases increased the hydrophilicity of the surface. The release of drugs in vitro was gradual, which corresponded to the Higuchi and Korsmeyer-Peppas models. Antibiotic-loaded membranes showed antibacterial activity against S. aureus and E. coli, in which growth inhibition zones were 41.7 ± 1.1 and 38.6 ± 1.7 mm for ceftazidime and doripinem, respectively. The study of the biological activity of membranes in the NIH 3T3 mouse fibroblast culture based on the results of DAPI and FITC staining of cells, as well as the MTT test, did not reveal a negative effect despite the presence of antibiotics in them. Samples containing actovegin exhibit a stimulating effect on fibroblasts. Biodegradable polyhydroxyalkanoates formed by 3-hydroxybutyrate and 4-hydroxybutyrate monomers provide electrospinning non-woven membranes suitable for long-term delivery of drugs and cultivation of eukaryotic cells, and are promising for the treatment of wound defects complicated by infection.

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Держатели документа:
Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 50/50 Akademgorodok, 660036 Krasnoyarsk, Russia
Institute of Fundamental Biology and Biotechnology, Siberian Federal University, 79 Svobodnyi av., 660041 Krasnoyarsk, Russia
Federal Research Center “Krasnoyarsk Science Center SB RAS”, 50 Akademgorodok, 660036 Krasnoyarsk, Russia
L.V. Kirensky Institute of Physics, 50/12 Akademgorodok, 660036 Krasnoyarsk, Russia
Chemistry Engineering Centre, ITMO University, Kronverkskiy Prospekt, 49A, 197101 Saint Petersburg, Russia

Доп.точки доступа:
Volova, Tatiana G.; Demidenko, Aleksey V.; Murueva, Anastasiya V.; Dudaev, Alexey E.; Nemtsev, I. V.; Немцев, Иван Васильевич; Shishatskaya, Ekaterina I.
}
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    Thermokinetic study of aluminum-induced crystallization of a-Si: The effect of Al layer thickness / S. M. Zharkov, V. V. Yumashev, E. T. Moiseenko [et al.] // Nanomaterials. - 2023. - Vol. 13, Is. 22. - Ст. 2925, DOI 10.3390/nano13222925. - Cited References: 70. - This work was supported by the Russian Science Foundation under grant #22-13-00313 . - ISSN 2079-4991
   Перевод заглавия: Термокинетическое исследование кристаллизации a-Si, индуцированной алюминием: влияние толщины слоя Al
Кл.слова (ненормированные):
amorphous silicon -- Al/Si -- nanolayer -- multilayer film -- metal-induced crystallization -- aluminum-induced crystallization -- kinetics -- activation energy -- enthalpy -- simultaneous thermal analysis (STA)
Аннотация: The effect of the aluminum layer on the kinetics and mechanism of aluminum-induced crystallization (AIC) of amorphous silicon (a-Si) in (Al/a-Si)n multilayered films was studied using a complex of in situ methods (simultaneous thermal analysis, transmission electron microscopy, electron diffraction, and four-point probe resistance measurement) and ex situ methods (X-ray diffraction and optical microscopy). An increase in the thickness of the aluminum layer from 10 to 80 nm was found to result in a decrease in the value of the apparent activation energy Ea of silicon crystallization from 137 to 117 kJ/mol (as estimated by the Kissinger method) as well as an increase in the crystallization heat from 12.3 to 16.0 kJ/(mol Si). The detailed kinetic analysis showed that the change in the thickness of an individual Al layer could lead to a qualitative change in the mechanism of aluminum-induced silicon crystallization: with the thickness of Al ≤ 20 nm. The process followed two parallel routes described by the n-th order reaction equation with autocatalysis (Cn-X) and the Avrami–Erofeev equation (An): with an increase in the thickness of Al ≥ 40 nm, the process occurred in two consecutive steps. The first one can be described by the n-th order reaction equation with autocatalysis (Cn-X), and the second one can be described by the n-th order reaction equation (Fn). The change in the mechanism of amorphous silicon crystallization was assumed to be due to the influence of the degree of Al defects at the initial state on the kinetics of the crystallization process.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Laboratory of Electron Microscopy, Siberian Federal University, Krasnoyarsk 660041, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Zharkov, S. M.; Жарков, Сергей Михайлович; Yumashev, V. V.; Moiseenko, E. T.; Altunin, R. R.; Solovyov, L. A.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Zeer, G. M.; Nikolaeva, N. S.; Belousov, O. V.
}
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Thermochemistry, structure, and optical properties of a new β-La2(SO4)3 polymorphic modification / S. A. Basova, M. S. Molokeev, A. S. Oreshonkov [et al.] // Inorganics. - 2023. - Vol. 11, Is. 11. - Ст. 434, DOI 10.3390/inorganics11110434. - Cited References: 58. - The work was partly carried out within the framework of the Strategic Academic Leadership Program “Priority-2030” for the Kazan Federal University and the state assignment of the Kirensky Institute of Physics. - We acknowledge Lisa-Marie Wagner (JLU Giessen) for help with X-ray powder diffractometry, and Svetlana Volkova and Irina Palamarchuk (UTMN) for help with IR- and UV-spectrometry. The use of equipment provided by the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” is acknowledged . - ISSN 2304-6740
Кл.слова (ненормированные):
rare earths -- lanthanum -- sulfate -- crystal chemistry -- thermodynamics -- chemical kinetics -- dielectrics
Аннотация: A new polymorphic modification of lanthanum sulfate was obtained by thermal dehydration of the respective nonahydrate. According to powder X-ray diffraction, it was established that β-La2(SO4)3 crystallized in the C2/c space group of the monoclinic system with the KTh2(PO4)3 structure type (a = 17.6923(9), b = 6.9102(4), c = 8.3990(5) Å, β = 100.321(3)°, and V = 1010.22(9) Å3). Temperature dependency studies of the unit cell parameters indicated almost zero expansion along the a direction in the temperature range of 300–450 K. Presumably, this occurred due to stretching of the [LaO9]n chains along the c direction, which occurred without a significant alteration in the layer thickness over the a direction. A systematic study of the formation and destruction processes of the lanthanum sulfates under heating was carried out. In particular, the decisive impact of the chemical composition and formation energy of compounds on the thermodynamic and kinetic parameters of the processes was established. DFT calculations showed β-La2(SO4)3 to be a dielectric material with a bandgap of more than 6.4 eV. The processing of β-La2(SO4)3 with the Kubelka–Munk function exhibited low values below 6.4 eV, which indicated a fundamental absorption edge above this energy that was consistent with LDA calculations. The Raman and infrared measurements of β-La2(SO4)3 were in accordance with the calculated spectra, indicating that the obtained crystal parameters represented a reliable structure.

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Держатели документа:
Department of Inorganic and Physical Chemistry, Tyumen State University, Tyumen 625003, Russia
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Laboratory of Theory and Optimization of Chemical and Technological Processes, Tyumen State University, Tyumen 625003, Russia
Laboratory of Molecular Spectroscopy, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
School of Engineering and Construction, Siberian Federal University, Krasnoyarsk 660041, Russia
A.M. Butlerov Chemistry Institute, Kazan Federal University, Kazan 420008, Russia
Institute of Inorganic and Analytical Chemistry, Justus-Liebig-University Giessen, 35392 Giessen, Germany
Laboratory of Coherent Optics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Institute of Nanotechnology, Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk 660041, Russia
Departement of Science and Innovation, Northern Trans-Ural Agricultural University, Tyumen 625003, Russia
School of Natural Sciences, Tyumen State University, Tyumen 625003, Russia
Center for Materials Research (LaMa), Justus-Liebig-University Giessen, 35392 Giessen, Germany
Construction Institute, Industrial University of Tyumen, Tyumen 625000, Russia

Доп.точки доступа:
Basova, S. A.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Zhernakov, M. A.; Khritokhin, N. A.; Aleksandrovsky, A. S.; Александровский, Александр Сергеевич; Krylov, A. S.; Крылов, Александр Сергеевич; Sal’nikova, E. I.; Azarapin, N. O.; Shelpakova, N. A.; Muller-Buschbaum, K.; Denisenko, Yu. G.
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Metal dusting as a key route to produce functionalized carbon nanofibers / A. R. Potylitsyna, I. V. Mishakov, Y. I. Bauman [et al.] // React. Kinet. Mech. Catal. - 2022. - Vol. 135, Is. 3. - P. 1387-1404, DOI 10.1007/s11144-022-02169-y. - Cited References: 65. - This work was supported by the Ministry of Science and Higher Education of the Russian Federation (Project numbers AAAA-A21-121011390054-1 (ID: 0239-2021-0010) and 121031700315-2) . - ISSN 1878-5190. - ISSN 1878-5204

РУБ Chemistry, Physical
Рубрики:
CHLORINATED HYDROCARBONS
   NI-CU
   DECOMPOSITION
   NANOTUBES
   CATALYST
Кл.слова (ненормированные):
Metal dusting -- Ternary nickel-molybdenum-tungsten alloy -- Trichloroethylene -- Acetonitrile -- Functionalized carbon nanofibers
Аннотация: The present paper reports a new method of producing N-doped carbon nanofibers via metal dusting of a ternary NiMoW alloy in the atmosphere containing C2HCl3 and CH3CN vapors at 600 °C. The initial alloy was prepared by a co-precipitation technique. The carbon deposition was monitored gravimetrically. The early stages of the metal dusting process were studied in detail using scanning and transmission electron microscopies. It was established that the rapid disintegration of the microdispersed NiMoW alloy with the formation of nanosized particles catalyzing the growth of carbon filaments occurs within the first 5 min of the reaction. The presence of C2HCl3 vapors in the reaction medium was shown to be the urgent condition to provide efficient metal dusting. The effect of the CH3CN concentration in the trichloroethylene-containing reaction mixture on the carbon deposition is investigated. As observed, the CH3CN content noticeable affects the carbon yield (after 2 h of reaction). The dome-shaped dependence of carbon yield reaches its maximal value of ~ 200 g/g(cat) at a CH3CN concentration of 33 vol%. According to X-ray photoelectron spectroscopy, the obtained carbon filaments are functionalized with Cl (0.1–1.2 wt%), O (3–6 wt%), and N (0.5–1.3 wt%). The prepared carbon filaments possess a segmented secondary structure, which is typical for carbon nanomaterials derived via catalytic decomposition of chlorine-substituted hydrocarbons. Low-temperature nitrogen adsorption measurement revealed that the specific surface area of the N-containing samples varies in a range from 370 to 550 m2/g.

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Держатели документа:
Boreskov Inst Catalysis, Pr Ac Lavrentieva 5, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Str Pirogova 2, Novosibirsk 630090, Russia.
Nikolaev Inst Inorgan Chem, Ac Lavrentieva 3, Novosibirsk 630090, Russia.
Kirensky Inst Phys, Akad Gorodok 50-38, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Potylitsyna, Arina R.; Mishakov, Ilya, V; Bauman, Yury, I; Kibis, Lidia S.; Shubin, Yury, V; Volochaev, M. N.; Волочаев, Михаил Николаевич; Melgunov, Maxim S.; Vedyagin, Aleksey A.; Ministry of Science and Higher Education of the Russian Federation [AAAA-A21-121011390054-1, 0239-2021-0010, 121031700315-2]
}
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    Solid-state reaction in Cu/a-Si nanolayers: A comparative study of STA and electron diffraction data / E. T. Moiseenko, V. V. Yumashev, R. R. Altunin [и др.] // Materials. - 2022. - Vol. 15, Is. 23. - Ст. 8457, DOI 10.3390/ma15238457. - Cited References: 45. - This work was supported by the Russian Science Foundation under grant # 22-13-00313 . - ISSN 1996-1944
   Перевод заглавия: Твердофазная реакция в нанослоях Cu/a-Si: сравнительное исследование данных, полученных методами СТА и дифракции электронов
Кл.слова (ненормированные):
copper silicide -- thin films -- nanolayer -- solid-state reaction -- phase formation -- kinetics -- activation energy -- enthalpy -- DSC -- electron diffraction
Аннотация: The kinetics of the solid-state reaction between nanolayers of polycrystalline copper and amorphous silicon (a-Si) has been studied in a Cu/a-Si thin-film system by the methods of electron diffraction and simultaneous thermal analysis (STA), including the methods of differential scanning calorimetry (DSC) and thermogravimetry (TG). It has been established that, in the solid-state reaction, two phases are formed in a sequence: Cu + Si → η″-Cu3Si → γ-Cu5Si. It has been shown that the estimated values of the kinetic parameters of the formation processes for the phases η″-Cu3Si and γ-Cu5Si, obtained using electron diffraction, are in good agreement with those obtained by DSC. The formation enthalpy of the phases η″-Cu3Si and γ-Cu5Si has been estimated to be: ΔHη″-Cu3Si = −12.4 ± 0.2 kJ/mol; ΔHγ-Cu5Si = −8.4 ± 0.4 kJ/mol. As a result of the model description of the thermo-analytical data, it has been found that the process of solid-state transformations in the Cu/a-Si thin-film system under study is best described by a four-stage kinetic model R3 → R3 → (Cn-X) → (Cn-X). The kinetic parameters of formation of the η″-Cu3Si phase are the following: Ea = 199.9 kJ/mol, log(A, s−1) = 20.5, n = 1.7; and for the γ-Cu5Si phase: Ea = 149.7 kJ/mol, log(A, s−1) = 10.4, n = 1.3, with the kinetic parameters of formation of the γ-Cu5Si phase being determined for the first time.

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Держатели документа:
Laboratory of Electron Microscopy, Siberian Federal University, 79 Svobodny Ave., 660041 Krasnoyarsk, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Akademgorodok 50/24, 660036 Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, 660036 Krasnoyarsk, Russia

Доп.точки доступа:
Moiseenko, E. T.; Yumashev, V. V.; Altunin, R. R.; Zeer, G. M.; Nikolaeva, N. S.; Belousov, O. V.; Zharkov, S. M.; Жарков, Сергей Михайлович
}
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    Kinetic study of a solid-state reaction in Ag/Al multilayer thin films by in situ electron diffraction and simultaneous thermal analysis / S. M. Zharkov, R. R. Altunin, V. V. Yumashev [et al.] // J. Alloys Compd. - 2021. - Vol. 871. - Ст. 159474, DOI 10.1016/j.jallcom.2021.159474. - Cited References: 47. - This work was supported by the Russian Science Foundation, Russia under grant #181300 080 . - ISSN 0925-8388. - ISSN 1873-4669
   Перевод заглавия: Исследование кинетики твердофазной реакции в мультислойных тонких пленках Ag/Al методами in situ дифракции электронов и синхронного термического анализа

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
STRUCTURAL PHASE-TRANSFORMATIONS
COMMITTEE RECOMMENDATIONS
ICTAC KINETICS
Кл.слова (ненормированные):
Thin films -- Intermetallic compound -- Solid-state reaction -- Phase transformations -- Kinetic model -- Activation energy
Аннотация: A solid-state reaction process in Ag/Al multilayer thin films has been investigated by the methods of in situ electron diffraction, simultaneous thermal analysis, transmission electron microscopy and X-ray diffraction with the aim of studying the phase formation kinetics of intermetallic compounds. The sequence of the phase transformations in the solid-state reaction has been established: Ag+Al→(Ag)+(Al)→(Ag)+δ-Ag2Al→μ-Ag3Al. The process of the solid-state interaction has been shown to consist of two steps; each of them is described by a kinetic model of the nth order reactions with autocatalysis. The kinetic parameters of the autocatalytic process of the phase formation for δ-Ag2Al and µ-Ag3Al, have been determined, in particular, their apparent activation energy: 126 kJ/mol and 106 kJ/mol, respectively.

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Держатели документа:
Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia.
RAS, Kirensky Inst Phys, SB, Fed Res Ctr,KSC, Akademgorodok 50-38, Krasnoyarsk 660036, Russia.
RAS, Inst Chem & Chem Technol, SB, Fed Res Ctr,KSC, Akademgorodok 50-24, Krasnoyarsk 660036, Russia.
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarskij Rabochij 31, Krasnoyarsk 660037, Russia.

Доп.точки доступа:
Zharkov, S. M.; Жарков, Сергей Михайлович; Altunin, R. R.; Yumashev, V. V.; Moiseenko, E. T.; Belousov, O. V.; Solovyov, L. A.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Zeer, G. M.; Russian Science Foundation, RussiaRussian Science Foundation (RSF) [181300 080]
}
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Physical principles of the formation of a nanoparticle electric double layer in metal hydrosols / A. P. Gavrilyuk [et al.] // Colloid Polym. Sci. - 2020. - Vol. 298, Is. 1. - P. 1-7, DOI 10.1007/s00396-019-04573-8. - Cited References: 25. - The reported research was funded by the Russian Foundation for Basic Research and the government of the Krasnoyarsk territory, Krasnoyarsk Regional Fund of Science, grant No 18-42-243023, the RF Ministry of Education and Science, the State contract with Siberian Federal University for scientific research in 2017–2019. . - ISSN 0303-402X. - ISSN 1435-1536
Кл.слова (ненормированные):
Nanoparticle -- Adsorption layer -- Elastic deformation -- Coagulation kinetics -- Elasticity modulus
Аннотация: The Brownian dynamics method is employed to study the formation of an electrical double layer (EDL) on the metal nanoparticle (NP) surface in hydrosols during adsorption of electrolyte ions from the interparticle medium. Also studied is the charge accumulation by NPs in the Stern layer. To simulate the process of the formation of EDL, we took into account the effect of image forces and specific adsorption, dissipative and random forces, and the degree of hydration of adsorbed ions on the EDL structure. The employed model makes it possible to determine the charge of NPs and the structure of EDL. For the first time, the charge of both the diffuse part of EDL and the dense Stern layer has been determined. A decrease in the electrolyte concentration (below c ˂ 0.1 mol/l) has been found to result in dramatic changes in the formation of the Stern layer.

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Держатели документа:
Institute of Computational Modeling SB RAS, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
L. V. Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Siberian State University of Science and Technology, Krasnoyarsk, Russia

Доп.точки доступа:
Gavrilyuk, A. P.; Isaev, I. L.; Gerasimov, V. S.; Герасимов, Валерий Сергеевич; Karpov, S. V.; Карпов, Сергей Васильевич
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10.

Renewable P-type zeolite for superior absorption of heavy metals: Isotherms, kinetics, and mechanism / M. Chen, S. Nong, Y. Zhao [et al.] // Sci. Total Environ. - 2020. - Vol. 726. - Ст. 138535, DOI 10.1016/j.scitotenv.2020.138535. - Cited References: 47. - This work was supported by the National Key Research and Development Program of China (Grant No. 2016YFB0901600 ); National Science Foundation of China (Grant No. 21871008 ); Science and Technology Commission of Shanghai Municipality (Grant No. 14520722000 ) and China Postdoctoral Science Foundation [Grant No. 8206300161 ]. Thank Shuying Nong for her experimental assistance . - ISSN 0048-9697
Кл.слова (ненормированные):
Uptake capacity -- High efficiency -- Drinkable level -- Regeneration
Аннотация: Zeolite is a characteristic material for removing heavy metals exhibiting by low tolerance quantities. It is particularly desirable although challenging to cultivate an unmodified and reusable zeolite for eradicating heavy metals with great capacity. Herein, we sought out and firstly synthesized the uniform octahedral zeolite Na6Al6Si10O32·12H2O for heavy metal ions trap, proven extraordinarily effective decontamination of M2+ (Pb2+, Cd2+, Cu2+, and Zn2+). The maximum capacities of Pb2+, Cd2+, Cu2+, and Zn2+ were 649, 210, 90 and 88 mg/g, and the distribution coefficients (Kd) was ~108 mL/g for Pb2+ which emphasized the superior effectiveness of Na6Al6Si10O32·12H2O contrasted with other zeolites. Rapid adsorption was observed that Pb2+ concentration (7.5 ppm) was reduced to 0.6 ppb in 2 min. The removal mechanism was ascribed to the ion exchange and hydroxyl groups thereby affording high adsorption capacity. We also investigated the heavy metal removal of zeolite 13X and 4A for comparison and concluded the determining factor affecting absorption capacity. The removal rate of Pb remained at 97% even after five regeneration recycles. The zeolite was therefore promising for practical water purification and industrialization.

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Держатели документа:
Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, China
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
CAS Key Laboratory of Materials for Energy Conversion and State Key Laboratory of High-Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China

Доп.точки доступа:
Chen, M.; Nong, S.; Zhao, Y.; Riaz, M. S.; Xiao, Y.; Molokeev, M. S.; Молокеев, Максим Сергеевич; Huang, F.
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