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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Voronin A. S., Masiygin A. N., Molokeev M. S., Khartov S. V.
Заглавие : Atomic layer deposition ZnO on porous Al2O3 nanofibers film
Коллективы : International Scientific Conference on Applied Physics, Information Technologies and Engineering
Место публикации : J. Phys. Conf. Ser. - 2020. - Vol. 1679, Is. 2. - Ст.022072. - DOI 10.1088/1742-6596/1679/2/022072
Примечания : Cited References: 10. - Studies by scanning electron microscopy and X-ray powder diffraction were performed on the equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center «Krasnoyarsk Science Center SB RAS». The transmission electron microscopy investigations were conducted in the SFU Joint Scientific Center supported by the State assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation
Аннотация: The paper presents the results of the formation and study of the morphological and structural characteristics of the mesoporous ZnO / Al2O3 nanofibers film (ZANF). The deposition of a ZnO layer on Al2O3 nanofibers film (ANF) ~ 1 µm thick was carried out by the method of atomic layer deposition. The morphology of the mesoporous composite layer ZnO / Al2O3 (ZANF) has been studied by scanning and transmission electron microscopy. It is shown that in the process of atomic layer deposition, the ZnO layer grows according to the Stranski-Krastanov mechanism. A ZnO layer less than 5 nm thick gives an island structure in which Al2O3 nanofibers are uniformly coated with ZnO particles, an increase in the ZnO layer thickness to 15 nm demonstrates a continuous coating of Al2O3 nanofibers. The system has a core-shell structure. The resulting composite structures are promising for applications in photocatalysis and gas sensing.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kuular A. A., Simunin M. M., Bermeshev T. V., Voronin A. S., Dobrosmyslov S. S., Fadeev Y. V., Molokeev M. S., Volochaev M. N., Khartov S. V.
Заглавие : The Influence of Alumina Nanofibers on the Physical and Mechanical Properties of Mineral-Filled Polyethylene: an Experimental Study
Место публикации : Tech. Phys. Lett. - 2020. - Vol. 46, Is. 12. - P.1215-1218. - ISSN 10637850 (ISSN), DOI 10.1134/S1063785020120214
Примечания : Cited References: 6. - This study was supported by the Ministry of Science and Higher Education of the Russian Federation within the framework of a state order to the Smart Materials and Structures Research Laboratory on the subject “Development of Multifunctional Smart Materials and Structures Based on Modified Polymer Composites Capable to Operate under Extreme Conditions,” subject no. FEFE-2020-0015
Аннотация: Improvement of physical and mechanical characteristics of mineral-filled polyethylene (MFPE) upon addition of alumina nanofibers with a high aspect ratio has been experimental studied. It is shown that, at the weight concentration of alumina nanofibers of 0.1 wt %, the ultimate tensile strength increases from 3.82 ± 0.04 to 6.70 ± 0.07 MPa and the Young’s modulus increases from 1.08 ± 0.01 to 1.38 ± 0.01GPa (with respect to MFPE). The MFPE/Al2O3 nanofiber composite can be described within a model of weak adhesive interaction between a filler and a matrix with high friction.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kobyakov A. V., Turpanov I. A., Patrin G. S., Rudenko R. Yu., Yushkov V. I., Kosyrev N. N.
Заглавие : Synthesis, Structure, and Magnetic Properties of an Al2O3/Ge-p/Al2O3/Co Thin-Film System
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 7. - P.864-865. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873819070220
Примечания : Cited References: 5. - This work was supported by the Russian Foundation for Basic Research, project no. 18-02-00161-а.
Аннотация: Structural and magnetic measurements are made of an Al2O3/Ge-p/Al2O3/Co thin-film system. The structure is synthesized via ion-plasma deposition and can be used as a tunnel heterostructure. The dependences of the magnetic properties of cobalt on the rate of its deposition and the rates of deposition of preceding layers are established. © 2019, Allerton Press, Inc.
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Вид документа : Статья из сборника (выпуск продолж. издания)
Шифр издания :
Автор(ы) : Denisova E. A., Nemtsev I. V., Telegin S. V., Iskhakov R. S., Kuzovnikova L. A., Shepeta N. A.
Заглавие : Microstructure and magnetic properties of Co58Ni10Fe5B16Si11 and Co58Ni10Fe5B16Si11-Al2O3 bulk amorphous coatings prepared by plasma spraying
Коллективы : International Conference on High-Tech and Innovations in Research and Manufacturing
Место публикации : J. Phys.: Conf. Ser. - 2020. - Vol. 1582, Is. 1. - Ст.012078. - DOI 10.1088/1742-6596/1582/1/012078
Примечания : Cited References: 18. - This work was funded by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, the Krasnoyarsk Regional Fund for the Support of Scientific and Technical Activities (project no. 18-42-240006 Nanomaterials with magnetic properties determined by the topological features of the nanostructure). The authors thank the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” for the provided equipment
Аннотация: The bulk soft magnetic glassy Co58Ni10Fe5B16Si11 alloy specimens have been prepared by plasma spray deposition. In order to increase resistivity of the material, the bulk Co58Ni10Fe5B16Si11-Al2O3 composite materials were fabricated. The investigations of structure and magnetic properties of the bulk samples were carried out by X-ray diffraction, electron microscopy and magnetic measurements. The relation of the structural features and magnetic characteristics of the bulk coating to the main parameters of the deposition regimes was determined. Optimized plasma spray deposition parameters allowed obtaining bulk glassy samples with magnetic parameters that are not inferior to the characteristics of a thermally treated rapidly quenched ribbon with the same composition. It was found that the bulk amorphous coatings can be characterized as a heterophase system. The relaxation annealing of the Co58Ni10Fe5B16Si11 bulk coating leads to a phase transition in this alloy in the precrystallization temperature range. The magnetic properties of the both kinds of coatings are correlated with changes in the microstructure. The appearance of nanocrystalline phase with TC640 K during relaxation heat treatment leads to a decrease of the coercivity and to an increase of the permeability. A comparison between the magnetic properties of the CoNiFe-BSi coating and (CoNiFe-BSi)-Al2O3, composite coating is carried out.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ryzhkov I. I., Kharchenko I. A., Mikhlina E. V., Minakov A. V., Guzei D. V., Nemtsev I. V., Volochaev M. N., Korobko A. V., Simunin M. M.
Заглавие : Growth of carbon nanotubes inside porous anodic alumina membranes: Simulation and experiment
Место публикации : Int. J. Heat Mass Transf. - 2021. - Vol. 176. - Ст.121414. - ISSN 00179310 (ISSN), DOI 10.1016/j.ijheatmasstransfer.2021.121414
Примечания : Cited References: 57. - This work is supported by the Russian Foundation for Basic Research, Project 18-29-19078
Аннотация: Porous anodic alumina (PAA) membranes represent a widely used and extensively studied template for production of carbon nanotubes (CNT). The PAA–CNT membranes possess a number of unique properties, such as controllable nanotube geometry, size– and chemically–based selectivity as well as high water permeability. In this work, we first propose a combination of gas phase and surface reaction models to quantitatively describe the growth of carbon nanotubes in PAA membranes in a commercial CVD reactor. A complimentary experimental study of CNT formation from ethanol precursor with argon as a carrier gas is performed. A new method for characterizing carbon nanotubes geometry by SEM and TEM image processing of membrane cross–sections is proposed. The simulations show that the carbon growth rate (in nm/min) averaged over the membrane remains constant during the deposition process until the pore diameter becomes relatively small, and rapidly falls to zero after that. The carbon nanotube thickness near the membrane surface is slightly higher than that in the membrane center. The carbon growth rate increases with synthesis temperature and pressure, while it decreases with the argon flow rate. The dependence of carbon growth rate on the ethanol/water flow rate reaches maximum at some intermediate value. These results are supported by the experimental data obtained from SEM/TEM image processing. It is found that the SEM data provide overestimated values of nanotube diameter and thickness in comparison with the TEM data. The obtained results provide new insights into the CNT growth kinetics in nanoporous media, and develop quantitative guidelines for synthesis of CNT–PAA membranes with precisely controlled nanopore geometry. It also validates the combined homogenous / heterogeneous reaction model by comparison with carbon deposition kinetics on a nanometer scale.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Minakov A. V., Pryazhnikov M. I., Simunin M. M., Dobrosmyslov S. S., Kuular A. A., Molokeev M. S., Volochaev M. N., Khartov S. V., Voronin A. S.
Заглавие : Rheological properties of colloidal suspensions of alumina nanofibers
Место публикации : J. Mol. Liq. - 2022. - Vol. 367. - Ст.120385. - ISSN 01677322 (ISSN), DOI 10.1016/j.molliq.2022.120385
Примечания : Cited References: 62. - This work is partially financed by Ministry of Science and Higher Education of the Russian Federation (project no. FSRZ-2020-0012)
Аннотация: We have studied the rheological properties of colloidal suspensions based alumina nanofibers (ANF) with a mass fraction of 0.125–2 wt%. The ANFs used in this work are stand out by a high aspect ratio L/D ∼ 106–107 (dry ANF before dispersion) and ease of dispersion due to the self-organized aligned structure of ANF, which is characteristic of our synthesis method. It was shown that ANF suspensions are characterized by high colloidal stability, zeta potential has a significant dependence on ANF volume fraction. ANF have a strong effect on the shear viscosity of colloidal suspensions; non-Newtonian behavior is observed in suspensions with an ANF mass fraction of 0.5 wt%. A comprehensive study of the propagation of ultrasound in ANF suspensions was carried out. Based on experimental results on the scattering of ultrasound in suspensions and theoretical calculations, data on the bulk viscosity of ANF suspensions were obtained for the first time. The results of the study allow us to judge the possibility of using ANF as a promising fibrous additive to optimize the rheological properties of suspensions for various technical purposes, which include drilling muds, paint and varnish compositions, concrete-cement mixtures.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Volkova I. R., Tyryshkina L. E., Volochaev M. N., Zaloga A. N., Shabanova K. A., Ovchinnikov A. V., Lyamkin A. I.
Заглавие : The effect of aluminum-oxide powders on the structure and properties of copper electrodeposited composite coatings
Место публикации : Prot. Met. Phys. Chem. Surf. - 2023. - Vol. 59, Is. 1. - P.71-75. - ISSN 20702051 (ISSN), DOI 10.1134/S2070205122700022. - ISSN 2070206X (eISSN)
Примечания : Cited References: 9
Аннотация: Copper electrodeposited composite coatings containing two types of aluminum-oxide powders with different dispersities (alumina Al2O3-1 and electroexplosive aluminum-oxide nanopowder Al2O3-2) are obtained during the work. The studies show that introducing the powders leads to a change in the microstructure of the composites and a change in the grain growth principles during the formation of the coatings. Refinement and ordering of the grain structure of the coatings occurs and twinning defects and texture are formed. The change in the formation of the microstructure of the composites leads to a change in some operational characteristics: an increase in the microhardness (by 10% in the composites with the addition of alumina and by more than 30% in the coatings with electroexplosive aluminum oxide) and ultimate tensile strength (by 20% in the composites with Al2O3-1 and almost 1.5-fold in the samples with Al2O3-2).
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Харченко И. А., Минаков А. В., Михлина Е. В., Немцев, Иван Васильевич, Рыжков И. И.
Заглавие : Экспериментальное и расчетное исследование осаждения углерода в мембранах пористого анодного оксида алюминия
Коллективы : "Решетневские чтения", международная научно-практическая конференция, Сибирский государственный университет науки и технологий им. акад. М. Ф. Решетнева, Информационные спутниковые системы им. академика М. Ф. Решетнева, АО, Красноярский машиностроительный завод, ОАО
Место публикации : Решетневские чтения: [Электронный ресурс] : материалы XXIV Междунар. науч.-практич. конф., посвящ. памяти ген. конструктора ракет.-космич. систем акад. М. Ф. Решетнева : в 2-х ч. : электронное издание. - Красноярск: СибГУим. М. Ф. Решетнева, 2020. - Ч. 1. - С. 553-555
Примечания : Библиогр.: 8. - Работа выполнена при финансовой поддержке РФФИ, проект No 18-29-19078 мк. Физико-химический анализ материалов был выполнен в Красноярском региональном центре коллективного пользования ФИЦ КНЦ СО РАН
Аннотация: Проведено экспериментальное исследование процесса формирование углеродных слоев в мембранах пористого анодного оксида алюминиям етодом CVD. Экспериментальные зависимости скорости роста углерода от температуры и расхода аргона хорошо согласуются с расчетами на основе математической модели
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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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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Samardak A. S., Ognev A. V., Samardak A. Y., Stebliy E. V., Modin E. B., Chebotkevich L. A., Komogortsev S. V., Stancu A., Panahi-Danaei E., Fardi-Ilkhichy A., Nasirpouri F.
Заглавие : Variation of magnetic anisotropy and temperature-dependent FORC probing of compositionally tuned Co-Ni alloy nanowires
Место публикации : J. Alloys Compd. - 2018. - Vol. 732. - P.683-693. - ISSN 09258388 (ISSN), DOI 10.1016/j.jallcom.2017.10.258
Примечания : Cited References: 60. - This work was supported by the Russian Foundation for Basic Research (grant 16-02-01015 А), by the Russian Ministry of Education and Science under the state task (3.5178.2017/8.9), by Act 211 of the Government of the Russian Federation (contract № 02.A03.21.0011) and by the Brain Pool Program (172S-2-3-1928) through the Korean Federation of Science and Technology Societies (KOFST) funded by the Ministry of Science, ICT and Future Planning. Financial support from Iranian Nanotechnology Initiative council is also acknowledged.
Ключевые слова (''Своб.индексиров.''): coercive force--magnetic anisotropy--magnetic hysteresis--binary alloy nanowires--alumina template--electrodeposition--first order reversal curves--stochastic magnetic domain--random anisotropy model
Аннотация: The magnetic microstructure of Co-Ni binary alloy nanowires electrodeposited with controlled composition into nanoporous aluminum oxide templates can be represented as an ensemble of stochastic magnetic domains, whose size is determined by the magnetic correlation length. Using a method based on the approaching of magnetization to saturation, we defined the dimension of regions with magnetic orientation coherency as the stochastic domain size. Based on the experimental measurements of magnetization curves near saturation and first order reversal curves (FORC), we described a relationship between the macroscopic and microscopic parameters of the nanowires depending on the crystal structure observed by high-resolution transmission electron microscopy in terms of the random anisotropy model. The alloy composition strongly determines the crystal structure, in particular, the grain size and hcp/fcc phase distribution, and influences the effective magnetic anisotropy energy providing the direction of easy magnetization in the nanowire arrays. The characterization of Co-Ni arrays by FORC method at room and low temperatures revealed the transformation of magnetic behavior and certain contributions to the energy of the effective magnetic anisotropy.
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