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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Паршин, Александр Михайлович, Зырянов, Виктор Яковлевич, Шабанов, Василий Филиппович
Заглавие : Конфигурации директора в структурах нематика, адсорбированного на поверхности полимера
Место публикации : Жидк. кристаллы и их практич. использ. - 2015. - Т. 15, Вып. 1. - С. 56-65. - ISSN 1991-3966; \b Liquid Crystals and their Application
Примечания : Библиогр.: 20. - Работа выполнена частично при финансовой поддержке программ Президиума РАН и РФФИ (грант № 15-02-06924).
Ключевые слова (''Своб.индексиров.''): нематический жидкий кристалл--полимер--адсорбция--дисклинация--конфигурация директора--nematic liquid crystal--polymer--adsorption--disclination--director configuration
Аннотация: Исследованы ориентационные структуры нематических жидких кристаллов, возникающие на поверхности полимера в результате адсорбции, и их устойчивость относительно шлирен-текстуры. Изучены особенности точечных и линейных сингулярностей в исследуемых структурах. Рассмотрены конфигурации директора в слое нематика, определяемые комбинацией двух ориентирующих факторов: воздействием линейной дисклинации, фактора, стремящегося задать однородное планарное упорядочение, а также влиянием точечного дефекта, задающего радиальную структуру директора. С использованием расчетного метода проведен сравнительный анализ энергии упругих искажений поля директора для различных видов конфигураций: радиально-планарной, радиально-гомеотропной и радиально-радиальной в зависимости от толщины слоя нематика.The orientational structures of nematic liquid crystals that form at the polymer surface due to adsorption and their stability with respect to the schlieren texture are investigated. Features of point and linear singularities in these structures are studied. The director configurations in nematic layer as a result of the combination of two aligning factors, which are the linear disclination that tends to impose uniform planar ordering and point defect that imparts the radial structure to the director are considered. The analysis of the elastic distortions energies of the director configurations for the radial-planar, radial-homeotropic and radial-radial structures, depending on the nematic layer thickness was performed using the calculation method.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Паршин, Александр Михайлович, Сутормин, Виталий Сергеевич, Зырянов, Виктор Яковлевич, Шабанов, Василий Филиппович
Заглавие : Влияние ионного сурфактанта на энергию сцепления жидкого кристалла с поверхностью, исследованное с использованием магнитных пороговых полей перехода Фредерикса
Место публикации : Жидк. кристаллы и их практич. использ. - 2018. - Т. 18, № 3. - С. 59-66. - ISSN 1991-3966, DOI 10.18083/LCAppl.2018.3.59; Liq. Cryst. Appl. - ISSN 2499-9644
Примечания : Библиогр.: 25. - В. С. Сутормин благодарен РФФИ за поддержку исследований по гранту № 16-32-60036 мол_а_дк.
Предметные рубрики: WALL INTERFACE
TEMPERATURE-DEPENDENCE
NEMATIC DROPLETS
ADSORPTION
Ключевые слова (''Своб.индексиров.''): нематический жидкий кристалл--ионный сурфактант--энергия сцепления--магнитное поле--переход фредерикса--nematic liquid crystal--ionic surfactant--anchoring energy--magnetic field--freedericksz transition
Аннотация: Исследовано сцепление нематического жидкого кристалла 5ЦБ и 5ЦБ, допированного ионным сурфактантом ЦТАБ, в ячейках с плоскопараллельными ограничивающими поверхностями. Получены зависимости интенсивности проходящего лазерного излучения от величины магнитного поля для ячеек с различными толщинами слоя нематика при различных температурах. Из пороговых полей перехода Фредерикса определены значения полярной энергии сцепления жидкого кристалла с поверхностью. Изучено влияние ионного сурфактанта на энергию сцепления, установлено, что добавление в объем жидкого кристалла ионного сурфактанта ведет к ее ослаблению. Проведен анализ точности определения энергии сцепления на основе выражения, следующего из соотношения Рапини – Популара. Показано, что лучшее экспериментальное разрешение энергии сцепления достигается при использовании тонких слоев нематика, более сильных магнитных полей, а также слабого сцепления молекул жидкого кристалла с поверхностью.The coupling of nematic liquid crystal 5CB and 5CB doped with ionic surfactant CTAB in the cells with plane parallel interfaces was studied. For the cells with the varied nematic layer thickness at different temperatures, the dependencies of the passed laser radiation intensity on the magnetic field were obtained. From the threshold fields of Freedericksz transition, the polar anchoring energy of the liquid crystal to the surface was determined. The effect of the ionic surfactant on the anchoring energy was studied and it was found that the addition of the ionic surfactant to liquid crystal weakens the anchoring energy. The analysis of the accuracy of the anchoring energy determination based on the expression following from the Rapini - Popular relation was carried out. It was shown that the best experimental resolution of the anchoring energy is achieved when the thin nematic layers, stronger magnetic fields and weak anchoring of the liquid crystal molecules with the surface are used.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzubov A. A., Eliseeva N. S., Krasnov P. O., Kuklin A. V., Kovaleva E. A., Kholtobina A. S.
Заглавие : Theoretical investigation of the adsorption and diffusion of hydrogen on the surface and in the bulk of the intermetallic compound Mg2Ni
Место публикации : Phys. Solid State: Pleiades Publishing, 2014. - Vol. 56, Is. 10. - P.2035-2042. - ISSN 1063-7834, DOI 10.1134/S1063783414100187. - ISSN 1090-6460
Примечания : Cited References: 30
Предметные рубрики: STORAGE MATERIAL Mg2NiH4
INITIO MOLECULAR-DYNAMICS
AUGMENTED-WAVE METHOD
MINIMUM ENERGY PATHS
ELASTIC BAND METHOD
TEMPERATURE STRUCTURE
SADDLE-POINTS
ALLOYS
TRANSITION
MAGNESIUM
Аннотация: The intermetallic compound Mg2Ni as a potential material for hydrogen storage has been investigated theoretically. The sorption and diffusion of a hydrogen atom in the bulk and on the surface of this material, as well as the step-by-step process of dissociative chemisorption of a H-2 molecule on the surface, have been considered. The dependence of the sorption energy of atomic hydrogen on the structural characteristics of the intermetallic compound Mg2Ni has been analyzed.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ronzhin N. O., Posokhina E. D., Mikhlina E. V., Shestakov N. P., Nemtsev I. V., Bondar V. S., Ryzhkov I. I.
Заглавие : The effect of copper and iron adsorption on the catalytic performance of alumina nanofiber / nanodiamond composite in sensing applications
Место публикации : J. Phys. Chem. Solids. - 2022. - Vol. 167. - Ст.110785. - ISSN 00223697 (ISSN), DOI 10.1016/j.jpcs.2022.110785
Примечания : Cited References: 68. - This work is supported by the Russian Foundation for Basic Research, Project 18–29–19078. The authors would like to express their special thanks to Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS» for providing the equipment to ensure the accomplishment of this project
Аннотация: Phenolic compounds are common environmental pollutants, which are used in many industries and contaminate water environment due to industrial wastewater discharge. Presently, there is an increasing demand for the development and improvement of inexpensive, easy-to-use analytical tools for in-situ detection of phenolic compounds. In this work, we investigate the effect of adsorption of Cu2+ and Fe2+ ions on the catalytic activity of a composite material based on alumina nanofibers (ANF) and detonation nanodiamonds (DND) in the co-oxidation of phenols with 4-aminoantipyrine in the presence of hydrogen peroxide. We have found more than two-fold increase of the catalytic activity for ANF + DND + Cu composite, while the activity of ANF + DND + Fe composite is found to decrease by several times in comparison with the original ANF + DND material. The results of FTIR analysis indicate that the adsorption of iron ions occurs with the formation of hydroxide surface groups and hydrogen bonds, which apparently block their catalytic activity in the Fenton redox cycle. The higher catalytic performance of AND + DND composite functionalized with copper ions makes it possible to detect two times lower concentrations of analytes (phenol and 4-chlorophenol) in comparison with the original composite. It is shown that the AND + DND + Cu composite provides a linear yield of the co-oxidation reaction product in a wide range of analyte concentrations (0.25–100 μM for phenol and 0.5–25 μM for 4-chlorophenol). Model experiments demonstrate the applicability of copper-functionalized composite as a reusable sensor for the determination of phenol in aqueous samples.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ponomarenko I. V., Parfenov V. A., Zaitseva Y. N., Zharkov S. M., Kirik S. D.
Заглавие : Template synthesis of CMK-3 nanostructured carbon material and study of its properties
Место публикации : Glass Phys. Chem. - 2014. - Vol. 40, Is. 1. - P.79-87. - ISSN 1087-6596, DOI 10.1134/S1087659614010180
Ключевые слова (''Своб.индексиров.''): adsorption of n2--cmk-3 mesostructured carbon--mesoporous mesostructured silicates--sba-15--template synthesis--transmission electron microscopy--x-ray diffraction
Аннотация: Mesostructured carbon has been obtained by template synthesis. SBA-15 mesostructured silicate has been used as a template. The effect of the properties of a template on the ordering of a replica has been studied. It has been shown with the use of X-ray diffraction, gas adsorption, and electron microscopy that there are evident correlations of the conditions of synthesis of a template with the ordering of a carbon replica, which can be guided by the synthesis of materials. The ordering of a replica significantly depends on the mesopore volume of the initial template and thickness of the pore wall. One should use templates with the highest possible mesopore volume and minimal wall thickness to obtain highly ordered replicas. These templates can be prepared during the treatment of synthesized materials at temperatures close to 100 C. It has been determined that, when there is SBA-15, the presence of micropores is a necessary condition for the preparation of carbon replicas that retain the structure of the template. © 2014 Pleiades Publishing, Ltd.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrilyuk A. P., Gerasimov V. S., Ershov A. E., Karpov S. V.
Заглавие : Temperature dependent elastic repulsion of colloidal nanoparticles with a polymer adsorption layer
Коллективы : Russian Foundation for Basic Research; government of the Krasnoyarsk territory and Krasnoyarsk Regional Fund of Science [18-42-243023]; RF Ministry of Science and Education,; State contract with Siberian Federal University for scientific research in 2017-2019; SB RAS Program [II.2P (0358-2015-0010)]
Место публикации : Colloid Polym. Sci. - 2018. - Vol. 296, Is. 10. - P.1689-1697. - ISSN 0303-402X, DOI 10.1007/s00396-018-4383-y. - ISSN 1435-1536(eISSN)
Примечания : Cited References: 49. - The reported research was funded by the Russian Foundation for Basic Research, the government of the Krasnoyarsk territory and Krasnoyarsk Regional Fund of Science, grant 18-42-243023, the RF Ministry of Science and Education, the State contract with Siberian Federal University for scientific research in 2017-2019, and SB RAS Program No II.2P (0358-2015-0010).
Предметные рубрики: STERICALLY-STABILIZED PARTICLES
DEPLETION FLOCCULATION
AGGREGATION
Ключевые слова (''Своб.индексиров.''): nanoparticle--adsorption layer--elastic deformation--coagulation--kinetics--elasticity modulus
Аннотация: The model of pairwise elastic repulsion of contacting colloidal nanoparticles with a rigid core and deformable shell is discussed. A simple analytical equation is applied for the energy of elastic repulsion of nanoparticles with arbitrary sizes and the elasticity moduli of self-healing polymer adsorption layers. The model is based on the representation of the absorption layer as a continuous medium that is elastically deformed upon the contact of nanoparticles. The major characteristic of this medium is the elasticity modulus. The magnitude of the elasticity modulus is determined from the condition of balance of the van der Waals attractive forces of nanoparticles and the elastic repulsion of their adsorption layers in the contact area, taking into account the temperature variations. We employed the kinetic approach to describe the dependence of the elasticity modulus on both the temperature and the rate of its change.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abylgazina L., Senkovska I., Ehrling S., Bon V., St. Petkov P., Evans J. D., Krylova S. N., Krylov A. S., Kaskel S.
Заглавие : Tailoring adsorption induced switchability of a pillared layer MOF by crystal size engineering
Место публикации : CrystEngComm. - 2021. - Vol. 23, Is. 3. - P.538-549. - ISSN 14668033 (ISSN), DOI 10.1039/d0ce01497d
Примечания : Cited References: 71. - The authors thank the DFG (FOR 2433 MOF Switches, Project No. 279409724) for financial support. P.P. and J. D. E. thank Center for Information Services and High Performance Computing (ZIH) at TU Dresden for providing high-performance computing facilities. Authors acknowledge Helmholtz-Zentrum Berlin für Materialien und Energie for allocated beamtime at KMC-2 and MX14.2 beamlines. J. D. E. acknowledges the support of the Alexander von Humboldt foundation and HPC platforms provided by a GENCI grant (A0070807069)
Аннотация: The pillared layer framework DUT-8(Zn) (Zn2(2,6-ndc)2(dabco), 2,6-ndc = 2,6-naphthalenedicarboxylate, dabco = 1,4-diazabicyclo-[2.2.2]-octane, DUT = Dresden University of Technology) is a prototypical switchable MOF, showing characteristic adsorption and desorption induced open phase (op) to closed phase (cp) transformation associated with huge changes in cell volume. We demonstrate switchability strongly depends on a framework-specific critical particle size (dcrit). Superposed, the solvent removal process (pore desolvation stress contracting the framework) significantly controls the cp/op ratio after desolvation and, subsequently, the adsorption induced switchability characteristics of the system. After desolvation, the dense cp phase of DUT-8(Zn) shows no adsorption-induced reopening and therefore is non-porous for N2 at 77 K and CO2 at 195 K. However, polar molecules with a higher adsorption enthalpy, such as chloromethane at 249 K and dichloromethane (DCM) at 298 K can reopen the macro-sized crystals upon adsorption. For macro-sized particles, the outer surface energy is negligible and only the type of metal (Zn, Co, Ni) controls the DCM-induced gate opening pressure. The node hinge stiffness increases from Zn to Ni as confirmed by DFT calculations, X-ray crystal structural analysis, and low frequency Raman spectroscopy. This softer Zn-based node hinges and overall increased stabilization of cp vs. op phase shift the critical particle size at which switchability starts to become suppressed to even lower values (dcrit ‹ 200 nm) as compared to the Ni-based system (dcrit ≈ 500 nm). Hence, the three factors affecting switchability (energetics of the empty host, (Eop–Ecp) (I), particle size (II), and desolvation stress (III)) appear to be of the same order of magnitude and should be considered collectively, not individually.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuzubov A. A., Avramov P. V., Nikolaeva K. M., Mikhaleva N. S., Kovaleva E. A., Kuklin A. V., Fedorov A. S.
Заглавие : Study of interaction between transition metal atoms and bigraphene monovacancy by means of quantum chemistry
Место публикации : Comput. Mater. Sci.: Elsevier, 2016. - Vol. 112, Part A. - P.269-275. - ISSN 0927-0256, DOI 10.1016/j.commatsci.2015.11.002
Примечания : Cited References: 39. - The authors would like to thank Siberian Supercomputer Center (SSCC) of SB RAS, Novosibirsk; and L.V. Kirensky Institute of Physics of SB RAS, Krasnoyarsk, for providing the access to their supercomputers. This work was supported by the government contract of the Ministry of Education and Science of the Russian Federation to Siberian Federal University (Grant No. 16.1500.2014/K).
Предметные рубрики: INITIO MOLECULAR-DYNAMICS
MASSLESS DIRAC FERMIONS
GRAPHENE
VACANCIES
POINTS
GAS
Ключевые слова (''Своб.индексиров.''): bigraphene--spintronics--transition metal--adsorption--migration
Аннотация: First-row transition metal atoms adsorption on bigraphene monovacancy was studied within the framework of DFT in periodic boundary conditions. Electronic and magnetic properties of composites were analyzed and their potential utilization in spintronics was discussed. Barriers of metal atoms migration from bigraphene surface to the interlayer space through the vacancy were estimated in order to consider both thermodynamic and kinetic aspects of composites experimental preparation. Formation of metal atoms inner-sorbed on bigraphene was found to demand harsh synthesis conditions; whereas outer-sorbed composites demonstrate significantly higher degree of spin polarization which makes them perspective for usage in spintronic devices. © 2015 Elsevier B.V.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kononova O.N., Melnikov A.M., Borisova T.V., Krylov A. S.
Заглавие : Simultaneous ion exchange recovery of platinum and rhodium from chloride solutions
Место публикации : Hydrometallurgy. - 2011. - Vol. 105, Is. 3-4. - P.341-349. - JAN. - ISSN 0304-386X, DOI 10.1016/j.hydromet.2010.11.009
Примечания : Cited Reference Count: 46
Предметные рубрики: GROUP-METALS PGM
SEPARATION
CATALYST
ANION
ADSORPTION
EXTRACTION
CHEMISTRY
RESIN
Ключевые слова (''Своб.индексиров.''): platinum--rhodium--sorption--anion exchangers--chloride solutions--anion exchangers--chloride solutions--platinum--rhodium--sorption--ammonium thiocyanate--anion exchangers--basic parameters--chemical structure--chloride solutions--diffusion coefficients--distribution coefficient--exchange capacities--kinetic properties--noble metals--purolite--rhodium chloride--separation factors--sorption ability--work focus--ammonium compounds--chlorine compounds--desorption--hydrochloric acid--ion exchange--ion exchange resins--ions--platinum--platinum compounds--potassium hydroxide--precious metals--recovery--rhodium--sulfuric acid--thioureas--urea--rhodium compounds
Аннотация: This work focuses on the sorption recovery of platinum (II, IV) and rhodium (III) simultaneously present in chloride solutions, freshly prepared and stored over 3 months, on commercial anion exchangers with different physical and chemical structure. The sorption was carried out from solutions with 0.001-4.0 mol/L HCl. The initial platinum and rhodium concentrations in contacting solutions were 0.25-2.5 mmol/L Sorption and kinetic properties of the chosen anion exchangers were investigated and the basic parameters of exchange capacity, recovery, distribution coefficients, separation factors, process rate, diffusion coefficients and half-exchange times were calculated. It is shown that anion exchangers investigated possess high sorption ability to platinum and rhodium chloride complexes, which does not deteriorate in case of stored solutions. Desorption of platinum and rhodium from the resins investigated was carried out with hydrochloric acid (2 mol/L), thiourea (1 mol/L) in sulfuric acid (2 mol/L) or in potassium hydroxide (2 mol/L) as well as by ammonium thiocyanate (2 mol/L). It was shown that complete separation of platinum and rhodium can be carried out with 2 mol/L HCl on anion exchanger Purolite S 985, whereas 2 mol/L NH(4)SCN as an elution agent leads to complete separation of noble metals on anion exchangers Purolite S 985, Purolite A 500 and AM-2B. (C) 2010 Elsevier B.V. All rights reserved.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ivanova O. S., Edelman I. S., Sokolov A. Е., Svetlitsky E. S., Lin C.-R., Chen Y. -Z., Tseng Y.-T.
Заглавие : Selective adsorption capacity of Fe3O4@C nanoparticles with respect to organic cationic dyes
Коллективы : Asian School-Conference on Physics and Technology of Nanostructured Materials, Азиатская школа-конференция по физике и технологии наноструктурированных материалов
Место публикации : The Sixth Asian school-conference on physics and technology of nanostructured materials: Proceedings. - VLadivostok, 2022. - Ст.IV.p.14. - P.231-232. - ISBN 987-5-8044-1716-2
Примечания : Cited References: 3
Предметные рубрики:
Аннотация: The Fe3O4 and core-shell Fe3O4@C magnetic nanoparticles (NPs) with an average size of 15 ± 2 nm were synthesized and characterized. Comparative study of two types of NPs revealed their different sorption capacity of cationic and anionic dyes. The leading role of electrostaticinteractions in the dyes adsorption by Fe3O4@C NPs has been revealed.
Материалы конференции,
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhlin Y. L., Vorobyev S., Saikova S. V., Tomashevich Y., Fetisova O., Kozlova S., Zharkov S. M.
Заглавие : Preparation and characterization of colloidal copper xanthate nanoparticles
Коллективы : Russian Science Foundation [14-17-00280]
Место публикации : New J. Chem.: Royal Society of Chemistry, 2016. - Vol. 40, Is. 4. - P.3059-3065. - ISSN 1144-0546, DOI 10.1039/c6nj00098c. - ISSN 1369-9261(eISSN)
Примечания : Cited References:50. - This research was supported by the Russian Science Foundation grant 14-17-00280. We thank Dr Roberto Felix Duarte (HZB) and bilateral program "German-Russian laboratory at BESSY II" for assistance with the X-ray absorption experiments.
Предметные рубрики: X-ray-absorption
Self-assembled monolayers
Sulfide nanoparticles
Electronic-structure
Waste-water
Complexes
Flotation
Spectroscopy
Adsorption
Oxidation
Аннотация: Despite the important role of metal xanthates in a number of industrial processes and emerging applications, no attempts have been made to prepare the metal xanthate nanoparticles and to study colloidal solutions of insoluble heavy metal xanthates. Here, we examined the formation of colloidal copper xanthate particles during the reactions of aqueous solutions of cupric sulfate and various potassium xanthates, which occur in flotation and water treatment slurries and can be used to manufacture nanoparticles for materials science (e.g., as precursors for copper sulfide nanoparticles and biomedicine). The products were characterized using UV-vis absorption, dynamic light scattering, zeta potential measurements, transmission electron microscopy (TEM), electron diffraction, Fourier transform infrared spectroscopy, thermogravimetry, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy (XANES). Colloidal copper xanthates with compositions of ROCSSCu (R = ethyl, isopropyl, butyl, isobutyl, and amyl groups), disordered structures and average diameters of 20–80 nm easily formed and aggregated and were stable for at least several hours, especially if excessive xanthate was used. The hydrodynamic diameters of the nanoparticles were smaller at lower temperatures. Dixanthogens, which were produced in the reactions along with ROCSSCu, seemed to promote nanoparticle aggregation and precipitated with the copper xanthate, affecting their thermal decomposition. The TEM micrographs and S K- and Cu K-edge XANES spectra revealed core/shell particle morphologies, likely with Cu(I) bonded to four S atoms in the core and reduced copper coordination in the shell.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Melchakova I., Nikolaeva K. M., Kovaleva E. A., Tomilin F. N., Ovchinnikov S. G., Tchaikovskaya O. N., Avramov P. V., Kuzubov A. A.
Заглавие : Potential energy surfaces of adsorption and migration of transition metal atoms on nanoporus materials: The case of nanoporus bigraphene and G-C3N4
Место публикации : Appl. Surf. Sci. - 2021. - Vol. 540. - Ст.148223. - ISSN 01694332 (ISSN), DOI 10.1016/j.apsusc.2020.148223
Примечания : Cited References: 39. - The authors would like to thank Joint Supercomputer Center of RAS, Moscow; Center of Equipment for Joint Use of Siberian Federal University, Krasnoyarsk; and Information Technology Centre, Novosibirsk State University for providing the access to their supercomputers. Publication was supported by Project FSWM-2020-0033 of Russian Ministry of Science and Education
Аннотация: First-row transition metal (TM) atoms adsorption and migration on nanoporus 2D materials like bigraphene with double vacancies and g-C3N4 as the active sites for TM nanocluster's growth was studied within the framework of density functional theory. Both thermodynamic and kinetic aspects of composite synthesis were discussed. It was found that potential barriers of adatom's migration from bigraphene's outer surface to the interlayer space through the double vacancy are rather low values. High potential barriers of TM migration along the carbon plane prevents TM clusterization due to enhanced chemical activity of double vacancies which gives a possibility to capture the surface adatoms. As was shown for the monolayer graphene, the decrease of vacancies concentration reduces the barrier of adatom migration along the surface while the second graphene sheet in bigraphene stabilizes the structure. The behavior of TM-atom regarding g-CN2 and g-CN1 nanosheets was investigated. Potential energy surfaces were obtained and discussed. The migration barriers were found surmountable that means high probability of migration of TM adatoms to global minima and formation of TM vacancies. Comparison of barriers values with Boltzmann factor demonstrated that just standalone temperature fluctuations cannot initiate structural transitions. The properties of designed structures can be of interest of catalysts and biosensors for biomedical applications.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Sutormin V. S., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Polar anchoring energy and tilt angle measured by magneto-optical technique in nematic doped with ionic surfactant
Место публикации : Liq. Cryst. - 2020. - Vol. 47, Is. 12. - P.1825-1831. - ISSN 0267-8292, DOI 10.1080/02678292.2020.1733683. - ISSN 1366-5855(eISSN)
Примечания : Cited References: 32
Предметные рубрики: LIQUID-CRYSTAL
TEMPERATURE-DEPENDENCE
INTERFACE
ADSORPTION
Аннотация: The surface anchoring of a nematic doped with the ionic surfactant has been investigated and compared with the one in the undoped sample. The director tilt angle at the substrates coated with the orienting polymer film has been determined by the null method in a rotating magnetic field. The Frederiks transition in a magnetic field has been chosen as a convenient technique to measure the polar anchoring energy Wθ. The temperature dependences of anchoring energy have been obtained for the various nematic cells. The Wθ values for nematic doped with the ionic surfactant are less than for the undoped one. The factors affecting the measurement accuracy have been discussed. The accuracy is higher for the thinner nematic layers and weaker anchoring energy.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrilyuk A. P., Isaev I. L., Gerasimov V. S., Karpov S. V.
Заглавие : Physical principles of the formation of a nanoparticle electric double layer in metal hydrosols
Место публикации : Colloid Polym. Sci. - 2020. - Vol. 298, Is. 1. - P.1-7. - ISSN 0303-402X, DOI 10.1007/s00396-019-04573-8. - ISSN 1435-1536 (eISSN)
Примечания : 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.
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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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parshin A. M., Zyryanov V. Ya., Shabanov V. F.
Заглавие : The director field distribution with the strongly pinned alignment in nematic structures at the polymer surface
Коллективы : Russian Foundation for Basic Research [12-03-00816], Siberian Branch ofthe Russian Academy of Sciences (SB RAS) [30, 24.29, 24.32], SB RASthrough a Taiwan-SB RAS joint project
Место публикации : Liq. Cryst.: Taylor & Francis, 2015. - Vol. 42, Is. 1. - P.57-64. - ISSN 0267, DOI 10.1080/02678292.2014.960904. - ISSN 13665855(eISSN)
Примечания : Cited References:18. - This work was partially supported by the Russian Foundation for BasicResearch [project No. 12-03-00816] and by the Siberian Branch of theRussian Academy of Sciences (SB RAS) [grants nos. 30, 24.29, 24.32] andby SB RAS through a Taiwan-SB RAS joint project.
Предметные рубрики: LIQUID-CRYSTALS
DISCLINATION LINES
DEFECTS
Ключевые слова (''Своб.индексиров.''): orientational order--disclination--adsorption--nematic--polymer surface--director configuration
Аннотация: We investigate orientational nematic liquid crystal structures that form at the polymer surface due to adsorption, their stability against the schlieren texture and features of point and linear singularities in them. We demonstrate that surface disclination lines, which also occur due to molecular adsorption, can lead to azimuthal anchoring of a bulk layer and make the singularities with the charge m=+/- 1 stable. We consider the director field distribution in a nematic layer as a result of the combination of two aligning factors, which are the linear disclination that tend to impose uniform planar ordering and point defects that impart the radial configuration to the director. With the use of the calculation, we analyse the energies of elastic distortions of the director field for the radial-planar, radial-homeotropic and radial-radial configurations, depending on the nematic layer thickness.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhlin Y. L., Vishnyakova E. A., Romanchenko A. S., Saikova S. V., Likhatski M. N., Larichev Y. V., Tuzikov F. V., Zaikovskii V. I., Zharkov S. M.
Заглавие : Oxidation of Ag nanoparticles in aqueous media: Effect of particle size and capping
Место публикации : Appl. Surf. Sci.: Elsevier Science, 2014. - Vol. 297. - P.75-83. - ISSN 0169-4332, DOI 10.1016/j.apsusc.2014.01.081. - ISSN 1873-5584
Примечания : Cited References: 58. - This work was partially financially supported by the Ministry of Education and Science of RF (Grant 8580) and RFBR (12-03-31178).
Предметные рубрики: EX-SITU XPS
POLYCRYSTALLINE SILVER ELECTRODES
RAY PHOTOELECTRON-SPECTROSCOPY
METAL NANOPARTICLES
ELECTROCHEMICAL OXIDATION
ABSORPTION SPECTROSCOPY
PYROLYTIC-GRAPHITE
OXYGEN-ADSORPTION
TRANSFORMATIONS
DISSOLUTION
Ключевые слова (''Своб.индексиров.''): silver nanoparticles--oxidation--resistive switching effect--x-ray photoelectron spectroscopy
Аннотация: Many applications and environmental impact of silver-bearing nanomaterials critically depend upon their specific reactivity, which is still poorly understood. Here, silver nanoparticles (Ag NPs) of about 3-5 nm and 10-12 nm in diameter, uncapped and capped with l-glucose or citrate, were prepared, characterized using UV-vis absorption spectroscopy, SAXS, TEM, and their (electro) chemical oxidation was examined in comparison with each other and bulk metal applying scanning tunneling microscopy and spectroscopy, cyclic voltammetry, and XPS. A resistive switching effect was found in the tunneling spectra measured in air at the smaller uncapped Ag NPs deposited on HOPG and was interpreted in terms of Ag transfer between the particle and the probe. The anodic oxidation of these Ag NPs in 1 M NaOH yielded 3D Ag2O, while only a layer of "primary"Ag(I) oxide emerged on larger uncapped nanoparticles during the potential sweep. The formation of AgO at higher potentials proceeded readily at the "primary"oxide but was retarded at the smaller NPs. The citrate- and glucose-capping substantially impeded the formation both of Ag2O and AgO. The findings highlighted, particularly, a non-trivial effect of particle size and transient mobilization of Ag species on the reactions of silver nanoparticles. (c) 2014 Elsevier B.V. All rights reserved.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Mikhlin Y. L., Vorobyev S. A., Saikova S. V., Vishnyakova E. A., Romanchenko A. S., Zharkov S. M., Larichev Y. V.
Заглавие : On the nature of citrate-derived surface species on Ag nanoparticles: Insights from X-ray photoelectron spectroscopy
Место публикации : Appl. Surf. Sci.: Elsevier Science, 2018. - Vol. 427. - P.687-694. - ISSN 01694332 (ISSN), DOI 10.1016/j.apsusc.2017.09.026
Примечания : Cited References: 50. - We thank the Russian-German bilateral program “Russian-German laboratory at BESSY II” and the staff of the RGLab and HZB for their kind assistance with XANES experiments.
Ключевые слова (''Своб.индексиров.''): silver nanoparticles--adsorption--citrate capping--x-ray photoelectron spectroscopy
Аннотация: Citrate is an important stabilizing, reducing, and complexing reagent in the wet chemical synthesis of nanoparticles of silver and other metals, however, the exact nature of adsorbates, and its mechanism of action are still uncertain. Here, we applied X-ray photoelectron spectroscopy, soft X-ray absorption near-edge spectroscopy, and other techniques in order to determine the surface composition and to specify the citrate-related species at Ag nanoparticles immobilized from the dense hydrosol prepared using room-temperature reduction of aqueous Ag+ ions with ferrous ions and citrate as stabilizer (Carey Lea method). It was found that, contrary to the common view, the species adsorbed on the Ag nanoparticles are, in large part, products of citrate decomposition comprising an alcohol group and one or two carboxylate bound to the surface Ag, and minor unbound carboxylate group; these may also be mixtures of citrate with lower molecular weight anions. No ketone groups were specified, and very minor surface Ag(I) and Fe (mainly, ferric oxyhydroxides) species were detected. Moreover, the adsorbates were different at AgNPs having various size and shape. The relation between the capping and the particle growth, colloidal stability of the high-concentration sol and properties of AgNPs is briefly considered. © 2017 Elsevier B.V.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Karacharov A. A., Likhatski M. N., Borisov R. V., Tomashevich E. V., Vorobyev S. A., Zharkov S. M.
Заглавие : Modification of synthetic valleriite surface with gold nanoparticles: The roles of specific adsorption and zeta potential
Колич.характеристики :12 с
Место публикации : Colloid J. - 2024. - Vol. 86, Is. 1. - P.40-51. - ISSN 1061933X (ISSN), DOI 10.1134/S1061933X23601075. - ISSN 16083067 (eISSN)
Примечания : Cited References: 69. - This work was supported by the Russian Science Foundation project no. 22-13-00321
Аннотация: Layered two-dimensional materials, whose properties dramatically differ from their bulk precursors, are of great theoretical and applied importance. Recently, a layered 2D material, an analog of a natural mineral, valleriite, in which quasi-monoatomic Cu−Fe−S sheets alternate with brucite-like ones, has been prepared using a simple hydrothermal synthesis procedure. The features of the electronic structure of these materials make it possible to propose them as new materials for a wide field of applications such as (electro)photocatalysis, high-capacity batteries, etc. In this work, nanocomposite materials have been prepared via immobilization of gold nanoparticles (AuNPs) from citrate hydrosols on the surface of the synthesized valleriites having different compositions of hydroxide layers, which control the surface charge density. According to X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), energy-dispersive X-ray microanalysis (EDX), and selected area electron diffraction (SAED) data, AuNPs are immobilized on valleriite nanoflakes, which have lateral sizes of 150–200 nm and thicknesses of several tens of nanometers, as isolated metal nanoparticles with an average diameter of 11 nm. A small amount of aggregates indicates a high affinity of AuNPs for the valleriite surface. The amounts of immobilized gold are the same on all studied valleriites (~0.2%). This finding may be related to the simultaneous sorption of free citrate ions from the AuNP hydrosols, with these ions, according to zeta potential measurements, charging the surfaces of all studied valleriite samples to nearly the same negative value of –40 mV. According to the XPS data, the AuNPs immobilization markedly decreases the magnesium and oxygen contents on the surfaces of the synthesized valleriites due to the partial degradation/dissolution of the brucite layer. In addition, the amount of Fe3+ ions bound to OH groups decreases with a simultaneous increase in the fraction of Fe3+–O species. The TEM data have confirmed the preservation of the layered structure of valleriites after the immobilization of AuNPs.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Morozov E. V., Buznik V. M., Bespalov A. S., Grashchenkov D. V.
Заглавие : Magnetic Resonance Imaging of Water Absorption by Highly Porous Ceramic Materials
Место публикации : Dokl. Chem. - 2019. - Vol. 484, Is. 2. - P.44-47. - ISSN 00125008 (ISSN), DOI 10.1134/S0012500819020058
Примечания : Cited References: 9. - The studies were performed using equipment of KRTsKP FITs "KNTs SO RAN" in the framework of the program of basic research of the Russian Academy of Sciences (project no. V.44.1.7.) regarding the development of the MRI methodology for studying composite and porous materials, and also supported by the Russian Foundation for Basic Research (project no. 16-29-05334ofi_m "Scientific foundations for creating thin-film coatings with controlled wettability") regarding the development of water-repellent porous materials.
Ключевые слова (''Своб.индексиров.''): magnetic resonance imaging--porosity--ceramic materials--hydrophobic coatings--adsorption--capillary phenomena
Аннотация: A nontrivial character of water absorption in highly porous ceramic materials has been demonstrated for the first time by magnetic resonance imaging: a phenomenon of hygroscopic memory has been detected consisting in the concentration of adsorbed water in certain areas inside the sample, repeated during subsequent wetting with water. It has been shown that hydrophobization of the material by applying fluoro paraffin coatings to oxide fibers using the method of dissolution of fluoropolymers in supercritical CO2 has a significant impact on the transport of water into products and can be considered an efficient means of protecting porous materials from moisture. The results demonstrate the capabilities of the MRI method in studying the water absorption and identifying water migration pathways in highly porous materials.
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20.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Ivanova O. S., Edelman I. S., Sokolov A. Е., Svetlitsky E. S., Chun-Rong Lin, Ying-Zhen Chen
Заглавие : Magnetic nanoparticles Fe3O4, Fe3O4@sIo2, Fe3O4@C, and Fe3O4@C@C for the organic dyes adsorption
Коллективы : Российская академия наук, Физико-технический институт им. Е.К. Завойского ФИЦ Казанского научного центра РАН, Казанский (Приволжский) федеральный университет, Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium
Место публикации : VIII Euro-Asian symposium "Trends in magnetism" (EASTMAG-2022): Book of abstracts/ program com. S. G. Ovchinnikov [et al.]. - 2022. - Vol. 2, Sect. M: Magnetism in biology and medicine. - Ст.M.O4. - P.424-436. - ISBN 978-5-94469-051-7
Примечания : Cited References: 1. - Support by Ministry of Science and Technology of Taiwan, Grants MOST № 108-2923-M-153-001-MY3 and № 109-2112-M-153-003- is acknowledged
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