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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Pryazhnikov M. I., Zhigarev V. A., Minakov A. V., Nemtsev I. V.
Заглавие : Spontaneous imbibition experiments for enhanced oil recovery with silica nanosols
Колич.характеристики :14 с
Место публикации : Capillarity. - 2024. - Vol. 10, Is. 3. - P.73-86. - ISSN 27092119 (ISSN), DOI 10.46690/capi.2024.03.02. - ISSN 26523310 (eISSN)
Примечания : Cited References: 53. - This work is partially financed by Ministry of Science and Higher Education of the Russian Federation (No. FSRZ2020-0012)
Аннотация: Experimental oil displacement as a result of spontaneous imbibition of silica nanosols has been carried out using two types of sandstone as the reservoir rock. The permeability of the cores ranged from 0.34 to 333 mD, while the porosity was 11% and 22%, respectively. During the research, the influence of the concentration and nanoparticle size, as well as the permeability of the rock, on the process of spontaneous imbibition, was studied. Silica nanosols were considered as an object of study. The nanoparticle size ranged from 10 to 35 nm. The mass concentration of nanoparticles varied from 0.01% to 0.25%. It was found that the use of silica nanosols significantly increases the rate of the spontaneous imbibition process. It was established that a silica nanosol with a nanoparticle size of 10 nm and a concentration of 0.25% allows to displace more than six times oil compared to the reservoir water model in the same time. As a result, it was shown that the oil displacement efficiency and the efficiency of spontaneous imbibition increase along with an increase in the nanoparticle concentration and a decrease in the nanoparticle size.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Yaroslavtsev R. N., Tyumentseva A. V., Komogortsev S. V., Tyutrina E. S., Saitova A. T., Gerasimova Yu. V., Velikanov D. A., Rautskii M. V., Iskhakov R. S.
Заглавие : Manifestation of stoichiometry deviation in silica-coated magnetite nanoparticles
Место публикации : J. Phys. Chem. C. - 2022. - Vol. 126, Is. 17. - P.7510-7516. - ISSN 19327447 (ISSN), DOI 10.1021/acs.jpcc.2c00349
Примечания : Cited References: 30. - This work was supported by the Russian Science Foundation and the Krasnoyarsk Region Science and Technology Support Fund, grant No. 22-14-20020. We are grateful to the Center of collective use of FRC KSC SB RAS for the provided equipment
Аннотация: Iron oxide nanoparticles were synthesized by the coprecipitation method. Two varying Fe3O4/tetraethoxysilane ratios were used for silanization: 1:1.3 and 1:4.5. The samples were investigated using transmission electron microscopy, ferromagnetic resonance, IR spectroscopy, and magnetometry. Magnetic measurements have shown that the magnetite core in nanoparticles has a higher magnetization than stoichiometric magnetite nanoparticles of the same size. The increased magnetization was caused by the deviation of the magnetite stoichiometry due to the interaction with the silicate coating. The blocking temperature distribution was determined from the temperature dependence of the coercive force and from the ZFC/FC dependencies. Nanoparticles with a thicker shell have shown greater efficiency in DNA isolation.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Stolyar S. V., Velikanov D. A., Tyumentseva A. V., Komogortsev S. V., Yaroslavtsev R. N., Gerasimova Yu. V., Rautskii M. V., Iskhakov R. S.
Заглавие : The manifestation of stoichiometry deviation in silica-coated magnetite nanoparticles
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.P15. - P.451-453. - ISBN 978-5-94469-051-7
Примечания : Cited References: 4. - The study was supported by the Russian Science Foundation and the Krasnoyarsk Region Science and Technology Support Fund., grant No. 22-14-20020
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tyumentseva, Anna, V, Yaroslavtsev R. N., Stolyar S. V., Saitova, Alina T., Tyutrina, Ekaterina S., Gorbenko, Alexey S., Stolyar, Marina A., Olkhovskiy, Igor A.
Заглавие : Silica-coated iron oxide nanoparticles for DNA isolation for molecular genetic studies in hematology
Место публикации : Genet. Test. Mol. Biomark. - 2021. - Vol. 25, Is. 9. - P.611-614. - ISSN 1945-0265, DOI 10.1089/gtmb.2021.0067. - ISSN 1945-0257(eISSN)
Примечания : Cited References: 16
Предметные рубрики: OXIDATIVE STRESS
MUTATION
DAMAGE
Аннотация: Aim: To develop magnetic nanoparticles (MNPs) based on iron oxide for DNA isolation from blood cells for quantitative molecular genetic analyses of the V617F mutation in the Januskinase 2 (JAK2) gene. Materials and Methods: MNPs were synthesized by the coprecipitation method and coated with tetraethyl orthosilicate (TEOS). The size and shape of the complexes were estimated using transmission electron microscopy. Twenty blood samples from patients with myeloproliferative disorders were used for DNA isolation with the MNPs. DNA quality and compatibility for molecular genetic studies of the JAK2 V617F mutation were investigated by gel electrophoresis and real-time polymerase chain reaction (RT-PCR). Results: The average amount of DNA isolated from 150 μL of whole blood was 75.2 ng when MNPs were used and 72.5 ng when standard silica sorbent was used. There was no DNA damage observed after interaction with MNPs. RT-PCR demonstrated similar values for the JAK2 V617F mutant DNA ratios in the samples after DNA isolation with MNPs and by standard sorption on silica. Conclusions: MNPs with silicate capsules of sufficient thickness were obtained and the undesirable damaging effect of iron oxides on nucleic acids during isolation from cells were eliminated. Designed MNPs allow obtaining intact DNA for molecular genetic studies using the example of the JAK2 V617F for study.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bondarenko L. S., Kovel E. S., Kydralieva K. A., Dzhardimalieva G. I., Illes E., Tombacz E., Kicheeva A. G., Kudryasheva N. S.
Заглавие : Effects of modified magnetite nanoparticles on bacterial cells and enzyme reactions
Место публикации : Nanomaterials. - 2020. - Vol. 10, Is. 8. - Ст.1499. - P.1-20. - ISSN 20794991 (ISSN), DOI 10.3390/nano10081499
Примечания : Cited References: 83. - This research was funded by the Russian Foundation for Basic Research (#19-315-50048, #19-33-90149, and #18-29-19003)
Аннотация: Current paper presents biological effects of magnetite nanoparticles (MNPs). Analyzing effects of MNP’ characteristics (zeta-potential and hydrodynamic diameters) on bacteria and their enzyme reactions was the main focus. Photobacterium phosphoreum and bacterial enzymatic reactions were chosen as bioassays. Three types of MNPs were under study: bare Fe3O4, Fe3O4 modified with 3-aminopropyltriethoxysilane (Fe3O4/APTES), and humic acids (Fe3O4/HA). Effects of the MNPs were studied at a low concentration range (< 2 mg/L) and attributed to availability and oxidative activity of Fe3+, high negative surface charge, and low hydrodynamic diameter of Fe3O4/HA, as well as higher Fe3+ content in suspensions of Fe3O4/HA. Low-concentration suspensions of bare Fe3O4 provided inhibitory effects in both bacterial and enzymatic bioassays, whereas the MNPs with modified surface (Fe3O4/APTES and Fe3O4/HA) did not affect the enzymatic activity. Under oxidative stress (i.e., in the solutions of model oxidizer, 1,4-benzoquinone), MNPs did not reveal antioxidant activity, moreover, Fe3O4/HA demonstrated additional inhibitory activity. The study contributes to the deeper understanding of a role of humic substances and silica in biogeochemical cycling of iron. Bioluminescence assays, cellular and enzymatic, can serve as convenient tools to evaluate bioavailability of Fe3+ in natural dispersions of iron-containing nanoparticles, e.g., magnetite, ferrihydrite, etc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Babkina I. V., Volochaev M. N., Zhilova O. V., Kalinin Y. E., Kashirin M. A., Sitnikov A. V., Chehonadskih M. V., Yanchenko L. I.
Заглавие : Effect of Heat Treatment on the Stability of Nanosized (Co40Fe40B20)34(SiO2)66/ZnO/In2O3 Multilayers
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2020. - Vol. 84, Is. 9. - P.1100-1103. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873820090051
Примечания : Cited References: 11. - This work was supported by the RF Ministry of Science and Higher Education as part of State Task no. FZGM-2020-0007
Аннотация: An investigation is performed of the thermal stability and phase transformations of thin-film heterogeneous [(Co40Fe40B20)34(SiO2)66/ZnO/In2O3]85 multilayers obtained via ion beam sputtering. The system contains 85 layers, each consisting of a (Co40Fe40B20)34(SiO2)66 composite layer and ZnO and In2O3 semiconductor spacers. The sample structure in the initial state and after heat treatment is studied by means of X-ray diffraction. It is shown that the samples are stable at temperatures of up to 500°С. Zn2SiO4, InBO3, CoFe, and In2O3 phases form during annealing.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyaev B. A., Afonin A. O., Ugryumov A. V., Govorun I. V., Solovev P. N., Leksikov An. A.
Заглавие : Microstrip resonator for nonlinearity investigation of thin magnetic films and magnetic frequency doubler
Место публикации : Rev. Sci. Instrum. - 2020. - Vol. 91, Is. 11. - Ст.114705. - ISSN 00346748 (ISSN), DOI 10.1063/5.0009045
Примечания : Cited References: 40. - This work was supported by the Russian Science Foundation under Grant No. 19-72-10047
Аннотация: A structure that consists of a λ/4 stepped-impedance microstrip resonator is proposed as an instrument for the investigation of nonlinear effects in thin magnetic films and also can be used as a microwave frequency doubler. A conversion efficiency of 0.65% is observed at a one-layer 100 nm Ni80Fe20 thin film at an input signal level of 4.6 W for a 1 GHz probe signal. The maximum measured conversion efficiency (1% at 1 GHz) was achieved for the 9-layer Ni80Fe20 film where 150 nm magnetic layers were separated by SiO2 layers.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Knyazev Yu. V., Yakushkin S. S., Balaev D. A., Dubrovskiy A. A., Semenov S. V., Bayukov O. A., Kirillov V. L., Martyanov O. N.
Заглавие : Magnetic Properties of Ultrafine ε-Fe2O3 Nanoparticles in a Silicon Xerogel Matrix
Место публикации : Bull. Russ. Acad. Sci. Phys. - 2019. - Vol. 83, Is. 7. - P.875-877. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873819070219
Примечания : Cited References: 11
Аннотация: A new metamaterial is obtained on the basis of ε-Fe2O3 nanoparticles immobilized in a xerogel matrix. Samples are synthesized by impregnating SiO2 hydrogel with iron (II) salts with subsequent drying and calcination. The structure and magnetic properties of the composites are probed using transmission electron microscopy, X-ray diffraction, Mössbauer spectroscopy, and static magnetic measurements. © 2019, Allerton Press, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yakushkin S. S., Balaev D. A., Dubrovskiy A. A., Semenov S. V., Knyazev Yu. V., Bayukov O. A., Kirillov V. L., Ivantsov R. D., Edelman I. S., Martyanov O. N.
Заглавие : ε-Fe2O3 nanoparticles embedded in silica xerogel – Magnetic metamaterial
Место публикации : Ceram. Int. - 2018. - Vol. 44, Is. 15. - P.17852-17857. - ISSN 02728842 (ISSN), DOI 10.1016/j.ceramint.2018.06.254
Примечания : Cited References: 31. - This work was supported by the Russian Science Foundation, project no. 17-12-01111.
Ключевые слова (''Своб.индексиров.''): ε-fe2o3 iron oxide nanoparticles--metamaterial--mossbauer spectroscopy--magnetic properties--magnetic circular dichroism
Аннотация: A novel method for synthesizing a new metamaterial based on ε-Fe2O3 nanoparticles immobilized in the xerogel matrix was proposed. Samples with different contents of ε-Fe2O3 nanoparticles dispersed in silica xerogel were synthesized by impregnation of as prepared hydrogel with iron (II) salts with the subsequent calcination. The structure and magnetic properties of the prepared composites were studied by transmission electron microscopy, X-ray diffraction, Mössbauer spectroscopy, and static magnetic measurements. The absence of other iron oxide polymorphs, controllable particle size distribution, and high ε-Fe2O3 nanoparticle concentration in combination with the weak interparticle magnetic interactions ensured the preservation of the unique magnetic properties of individual ε-Fe2O3 nanoparticles and allowed us to obtain a novel metamaterial. The high optical transparency and homogeneity of the prepared composites made it possible to detect the magnetic circular dichroism (MCD) of the magnetic silica xerogel, which is typical of the ε-Fe2O3-based systems.
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10.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Yakushkin S. S., Balaev D. A., Shaikhutdinov K. A., Dubrovskiy A. A., Bukhtiyarova G. A., Martyanov O. N.
Заглавие : ε-Fe2O3 nanoparticles in silica matrix. system with unique magnetic properties for catalysis
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2017): 1-7 July 2017 : book of abstracts. - 2017. - Ст.3OR-C-6. - P.425
Примечания : Cited References: 6. - Support by Russian Science Foundation (Grant No. 17-12-01111)
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