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Magnetically dead layer in interacting ultrafine NiFe2O4 nanoparticles / Yu. V. Knyazev, D. A. Balaev, S. V. Stolyar [et al.] // J. Magn. Magn. Mater. - 2025. - Vol. 613. - Ст. 172675, DOI 10.1016/j.jmmm.2024.172675. - Cited References: 69. - This study was carried out within the State assignment of the Ministry of Science and Higher Education of the Russian Federation for the Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences. The synthesis of NiFe2O4 nanoparticles was carried out within the State assignment of the Ministry of Science and Higher Education of the Russian Federation for the Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. - The authors thank M.S. Molokeev for the XRD measurements. The electron microscopy, XRD, and ac susceptibility measurements were carried out on the equipment of the Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences . - ISSN 0304-8853. - ISSN 1873-4766
Кл.слова (ненормированные):
Dead Layer -- Surface defects -- Ferrites -- Nanoparticles
Аннотация: The interplay of the magnetically dead layer and structural defects in interacting ultrafine nickel ferrite (NiFe2O4) nanoparticles ( = 4 nm) have been investigated using transmission electron microscopy, X-ray diffraction, 57Fe Mössbauer spectrometry, and static (dc) magnetization and dynamic (ac) susceptibility measurements. According to the magnetic measurement data, there are three magnetic subsystems in NiFe2O4 nanoparticles. The first subsystem with the lowest blocking (spin freezing) temperature (TS = 8 K) involves atomic magnetic moments of magnetically disordered particles with a size of d ˂ 4 nm. The other two subsystems are formed by magnetic moments of the cores of nanoparticles more than 4 nm in size and by correlated surface spins in nanoparticle clusters. The magnetic moments of the ferrimagnetically ordered cores are blocked at a higher temperature (∼40 K). It has been shown that the most significant contribution to the energy dissipation is made upon blocking of the correlated nanoparticle surface spins from the magnetically dead layer on the nanoparticle surface. The magnetic measurements have shown that the thickness of this layer is dmd ≈ 1 nm for a particle with a diameter of ˂ d˃ = 4 nm. At the same time, the 57Fe Mössbauer spectrometry study has revealed a structural disorder penetrating to a depth of up to dcd ≈ 0.6 nm in a particle with a diameter of ˂ d˃ = 4 nm. This evidence for a faster violation of the magnetic order than in the case of the crystal order upon moving away from the center of a particle to its periphery.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036 Russia
Federal Research Center KSC SB RAS, Krasnoyarsk 660036 Russia

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Balaev, D. A.; Балаев, Дмитрий Александрович; Stolyar, S. V.; Столяр, Сергей Викторович; Shokhrina, A.O.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Pankrats, A. I.; Панкрац, Анатолий Иванович; Vorotynov, A. M.; Воротынов, Александр Михайлович; Krasikov, A. A.; Красиков, Александр Александрович; Skorobogatov, S. A.; Скоробогатов, Станислав Алексеевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
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Embedded ferrihydrite nanoparticles in a SiO2 medium with enhanced superparamagnetic blocking temperature / Yu. V. Knyazev, V. L. Kirillov, A. A. Krasikov [et al.] // Ceram. Int. - 2025. - Vol. 51, Is. 4. - P. 5020-5030, DOI 10.1016/j.ceramint.2024.11.473. - Cited References: 83. - This study was carried out within the State assignment of the Ministry of Science and Higher Education of the Russian Federation for the Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. The synthesis was carried out within the State assignment of the Ministry of Science and Higher Education of the Russian Federation for Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences (FWUR-2024-OO32). - The TEM and ac susceptibility studies were carried out on the equipment of the Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. We acknowledge Yuriy L. Mikhlin for the XPS measurements . - ISSN 0272-8842. - ISSN 1873-3956
Кл.слова (ненормированные):
Ferrihydrite -- Magnetic "core-shell" structure -- Interparticle interacrions
Аннотация: The composite material based on the ferrihydrite nanoparticles (5Fe2O3 · 9H2O) encapsulated in SiO2 matrix was synthesized. Synthesized sample has been characterized by transmission electron microscopy, room-temperature 57Fe Mössbauer spectroscopyand X-ray photoelectron spectroscopy. The data obtained have shown (i) the presence of isolated ferrihydrite nanoparticles with an average size of ∼4.3 nm in the SiO2 matrix and (ii) the complete absence of the nanoparticles binding with the SiO2 matrix. The temperature dependences of the ac and dc magnetization, as well as the temperature evolution of the Mössbauer spectra point out only the occurrence of the superparamagnetic blocking with decreasing temperature. The analysis of the relaxation time of particle magnetic moments have shown no magnetic interactions in the investigated system. A detailed examination of the magnetization curves has revealed that the non-interacted ferrihydrite nanoparticles formed by two magnetic subsystems: paramagnetic surface spins and the magnetically ordered core. Such magnetic morphology results in the significantly decrease of the anisotropy constant (K = 18 ∙ 105 erg/cm3) compared to interacted nanoparticles. At the same time, a decisive role in the magnetic behavior of the material is played by the subsystem of free spins, which involves about half of all iron atoms on the particle surface.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036, Krasnoyarsk, Russia
Boreskov Institute of Catalysis, Federal Research Center SB RAS, 630090, Novosibirsk, Russia
Siberian Federal University, 660041, Krasnoyarsk, Russia

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Kirillov, V. L.; Krasikov, A. A.; Красиков, Александр Александрович; Skorobogatov, S. A.; Скоробогатов, Станислав Алексеевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Smorodina, E. D.; Смородина, Екатерина Дмитриевна; Bayukov, O. A.; Баюков, Олег Артемьевич; Martyanov, O. N.; Balaev, D. A.; Балаев, Дмитрий Александрович
}
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Impact of annealing temperature on the structure, magnetic properties, and organic dyes adsorption capacity of Fe0.5Co2.5O4 nanoparticles obtained by combustion / O. S. Ivanova, I. S. Edelman, S. M. Zharkov [et al.] // J. Alloys Compd. - 2025. - Vol. 1011. - Ст. 178421, DOI 10.1016/j.jallcom.2024.178421. - Cited References: 39. - The work was supported by the Russian Science Foundation (project no. 23–22–10025, and by the Krasnoyarsk Regional Fund of Science and Technology Support. The powder diffraction and magnetic measurements were carried out at the analytical equipment of Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS". The authors also thank the Laboratory of Electron Microscopy of the Siberian Federal University Joint Scientific Center for assistance in conducting the electron microscopy investigations . - ISSN 0925-8388. - ISSN 1873-4669
Кл.слова (ненормированные):
nanoparticles -- Combustion synthesis -- Fe doped Cobalt oxide -- Annealing temperature -- Ostwald Ripening -- Magnetization -- Organic dye adsorption
Аннотация: Fe-doped cobalt oxide nanoparticles, FexCo3-xO4, attract considerable attention due to their unique properties, high application potential, and the ability to vary the properties over a wide range by changing the technological conditions. The annealing temperature is one of the decisive parameters critically affecting the properties of nanoparticles. In this work, we studied the Fe0.5Co2.5O4 (Co3O4 type) nanoparticles synthesized by the combustion method: the impact of annealing temperature (400, 500, 600, 700 and 800 °C) on their structural, morphological, magnetic characteristics and on their ability to absorb organic dyes. X-ray diffraction analysis revealed that the nanoparticles under study consisted of a crystalline phase of Fe0.5Co2.5O4, with an admixture of the iron oxide phase in trace concentrations. A giant increase in the crystallite size due to annealing was observed. Overall, the average crystallite size increased from ⁓5 nm in the as-prepared sample to ⁓110 nm in the sample annealed at 800 °C. These changes in size are explained by the efficiency of the Ostwald ripening process. They are accompanied by an increase in the magnetization of nanoparticles and an appearance of magnetic hysteresis. The study of the adsorption properties of the nanoparticles with respect to the most important water pollutants – organic dyes, i.e. cationic methylene blue (MB) and anionic Congo red (CR) revealed their high selective adsorption capacity to CR. The as-prepared nanoparticles had the highest capacity: the CR dye concentration in water decreased by 90 percent within 5 minutes of exposure to the nanoparticles in concentration of 1 g/L. When the annealing temperature increased from 400 to 800 °C, the adsorption capacity decreased by approximately half, but remained high enough to consider these nanoparticles as a promising material for CR selective removal from water.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russia
Siberian Federal University, Krasnoyarsk 660041, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russia
Department of Applied Physics, National Pingtung University, Pingtung City 90003, Taiwan

Доп.точки доступа:
Ivanova, O. S.; Иванова, Оксана Станиславовна; Edelman, I. S.; Эдельман, Ирина Самсоновна; Zharkov, S. M.; Жарков, Сергей Михайлович; Vorobyev, S.A.; Andryushchenko, T.A.; Андрющенко, Татьяна Александровна; Molokeev, M. S.; Молокеев, Максим Сергеевич; Sukhachev, A. L.; Сухачев, Александр Леонидович; Lin, Ch.-R.; Chen, Y.-Zh.; Huang, B.-X.
}
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Concanavalin A–activated magnetic nanoparticles as an affine material for urinary exosome isolation / V. V. Krasitskaya, K. A. Drandrova, A. V. Tyumentseva [et al.] // Biotechnol. Appl. Biochem. - 2025. - Vol. 72, Is. 3. - P. 766-776, DOI 10.1002/bab.2696. - Cited References: 41. - The HRTEM, SEM, and AFM studies as well as chromatographic purification of recombinant proteins were carried out on the equipment of the Krasnoyarsk Regional Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch of the Russian Academy of Sciences. The investigations of the exosome isolation by ultracentrifugation were carried out using the equipment of the Shared Core Facilities Molecular and Cell Technologies, Krasnoyarsk State Medical University. The NTA was performed using the equipment of the Center for Collective Use No. 40606 “Functional mapping of the brain” of the Institute of Higher Nervous Activity and Neurophysiology, Russian Academy of Sciences. The authors are grateful to I. V. Nemtsev and M. N. Volochaev (Federal Research Center KSC SB RAS) for the SEM and HRTEM measurements, respectively, Y. V. Gerasimova (Kirensky Institute of Physics SB RAS, Federal Research Center KSC SB RAS) for FTIR measurements, and S. A. Vorobyev (Institute of Chemistry and Chemical Technology SB RAS, Federal Research Center KSC SB RAS) for DLS measurements. The authors thank the volunteers who took part in the experiment, as well as doctor A. V. Mazaev (Krasnoyarsk Regional Clinical Oncological Dispensary named after A. I. Kryzhanovsky) who provided a sample of a patient with BC . - ISSN 0885-4513. - ISSN 1470-8744
Кл.слова (ненормированные):
amino-functionalized iron oxide nanoparticles -- concanavalin A -- exosomes -- luciferase NLuc
Аннотация: Exosomes are a type of membrane vesicle secreted into the extracellular medium by most cell types. They have a great potential for clinical practice as noninvasive biomarkers for diagnosis of various diseases, prognosis, and monitoring of therapy, which stimulates the development of simple methods for isolating exosomes from biological fluids. A novel affine material based on aminosilanized superparamagnetic core?shell nanoparticles for fast isolation of urinary exosomes is reported. Iron oxide nanoparticles coated with amino organosilane have been synthesized. The structural and magnetic characteristics of the resulting nanoparticles have been studied by transmission electron microscopy and ferromagnetic resonance. The surface of the synthesized nanoparticles has been chemically functionalized with lectin (concanavalin A), and the efficiency of the obtained material as a sorbent for affine exosome isolation from human urine has been demonstrated. A highly purified fraction of exosomes 90?200 nm in size has been obtained. The exosomal nature of the isolated vesicles has been confirmed by bioluminescent solid-phase microassay of tetrasporine receptor markers. The presence of exosomal miR-21 in the isolated human urine exosome samples has been established.

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Держатели документа:
Institute of Biophysics SB RAS, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Kirensky Institute of Physics SB RAS, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia

Доп.точки доступа:
Krasitskaya, V. V.; Drandrova, K. A.; Tyumentseva, A. V.; Vazhenina, I. G.; Важенина, Ирина Георгиевна; Lukyanenko, A. V.; Лукьяненко, Анна Витальевна; Stolyar, S. V.; Столяр, Сергей Викторович; Frank, L. A.
}
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    Application of mechanical separation method with filtration for nanodispersed FeNi powders with carbon coating / N. G. Vnukova, N. S. Nikolaev, G. N. Churilov [et al.] // Fuller. Nanotub. Carbon Nanostructures. - 2025. - Vol. 33, Is. 3. - P. 288-293, DOI 10.1080/1536383X.2024.2400270. - Cited References: 36 . - ISSN 1536-383X. - ISSN 1536-4046
   Перевод заглавия: Применение метода механического разделения с фильтрацией для получения нанодисперсных порошков FeNi с углеродным покрытием
Кл.слова (ненормированные):
Method of mechanical separation -- nanoparticles -- carbon shell -- crystal structures -- FeNi@C
Аннотация: It was shown that the method of mechanical separation with filtration could be used to separate metal nanoparticles in a carbon shell. The method was used for separation of FeNi nanoparticles with a carbon shell, previously isolated from carbon condensate by boiling in acids. The particles had a crystalline structure and magnetic characteristics (Mr/Ms = 0.30, Hc = 270 Oe). Method of mechanical separation with filtration made it possible to separate the sample into particles coated with a carbon shell (particles size 40–50 nm, size of the metal core 10–15 nm), and into metal particles with a diameter of 6–15 nm, dispersed in a carbon matrix. The work shows that the samples have similar magnetic properties (Mr/Ms = 0.27, Hc = 236 Oe) and chemical composition (Ni ∼ 10 wt.%, Fe ∼ 12 wt.%, C ∼ 57 wt.%). However, the samples differ in structure, one contains FeNi(220), FeNi(200), FeNi(111) and C(002) phases, while the other contains only FeNi(200) and C(002) phases.

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Держатели документа:
Kirensky Institute of Physics, FSBSI "Federal Research Center Krasnoyarsk Science Center SB RAS", Krasnoyarsk, Russia
Institute of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk, Russia

Доп.точки доступа:
Vnukova, N. G.; Внукова, Наталья Григорьевна; Nikolaev, N. S.; Николаев, Никита Сергеевич; Churilov, G. N.; Чурилов, Григорий Николаевич; Isakova, V. G.; Исакова, Виктория Гавриловна; Elesina, V. I.; Елесина, Виктория Игоревна; Glushenko, G. A.; Глущенко, Гарий Анатольевич
}
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Application of the luminous bacterium Photobacterium phosphoreum for toxicity monitoring of selenite and its reduction to selenium(0) nanoparticles / A. V. Zenkov, E. S. Sushko, O. A. Mogilnaya [et al.] // Spectrochim. Acta - A: Mol. Biomol. Spectrosc. - 2025. - Vol. 325. - Ст. 125078, DOI 10.1016/j.saa.2024.125078. - Cited References: 63. - This research was funded by the Russian Science Foundation and Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, grant No. 24-24-20001. - We acknowledge A.V. Raikov (School of Fundamental Biology and Biotechnology, Siberian Federal University, Krasnoyarsk, Russia) for spectral measurements; Dr. A.B. Sarangova (School of Fundamental Biology and Biotechnology, Siberian Federal University, Krasnoyarsk, Russia) for methodology of bacterial cultivation; Y.V. Chugaeva (Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", 660036 Krasnoyarsk, Russia) for support of the collection of bacteria and their cultivation. The SEM and TEM studies were performed in Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS" . - ISSN 1386-1425. - ISSN 1873-3557
Кл.слова (ненормированные):
Luminous marine bacteria -- Sodium selenite -- Toxicity -- Reactive oxygen species -- Biotransformation -- Selenium nanoparticles
Аннотация: Luminous marine bacteria are traditionally used as a bioassay due to the convenience and high rate of registering the intensity of their physiological function – luminescence. This study aimed to develop the application of Photobacterium phosphoreum in traditional and novel fields – toxicity monitoring and biotechnology. We demonstrated (1) effects of selenite ions on bioluminescence, and (2) biotransformation of selenite to selenium(0) in the form of nanoparticles. The effects of selenite (SeO32−) on the intensity of bacterial bioluminescence were studied, and its dependencies on exposure time and concentration of Na2SeO3 were analyzed. Bioluminescence activation and inhibition were revealed; dose–effect dependencies corresponded to the hormesis model. The toxicity of SeO32− was characterized by an effective concentration of 10−3 M. Effects of SeO32− on reactive oxygen species (ROS) in bacterial suspensions were studied. High positive correlations were found between the bioluminescence intensity and ROS content, which indicates the decisive role of ROS and associated redox processes in the bioeffects of selenite ions. Scanning and transmission electron microscopy revealed the presence of nano-structures in the bacteria exposed to selenite. The energy dispersion spectrum detected a high content of selenium in the nanoparticles. The particle size distribution depended on Na2SeO3 concentration; maxima of the distribution varied within 45–55 nm.

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Держатели документа:
School of Fundamental Biology and Biotechnology, Siberian Federal University, 660041 Krasnoyarsk, Russia
Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 660036 Krasnoyarsk, Russia
Institute of Physics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 660036 Krasnoyarsk, Russia
Institute of Biochemistry and Physiology of Plants and Microorganisms, Saratov Federal Scientific Center of the Russian Academy of Sciences, 410049 Saratov, Russia

Доп.точки доступа:
Zenkov, A. V.; Sushko, E. S.; Сушко, Екатерина Сергеевна; Mogilnaya, O. A.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Shabanov, A. V.; Шабанов, Александр Васильевич; Kamnev, A. A.; Tugarova, A. V.; Kudryasheva, N. S.
}
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Size effects on the magnetic properties of a system of ε-Fe2O3 nanoparticles embedded in a SiO2 xerogel matrix / D. A. Balaev, Yu. V. Knyazev, S. V. Semenov [et al.] // Ceram. Int. - 2025. - Vol. 51, Is. 1. - P. 650-663, DOI 10.1016/j.ceramint.2024.11.048. - Cited References: 109. - This study was supported by the Russian Science Foundation and Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 24-12-20011. https://rscf.ru/project/24-12-20011/ . - ISSN 0272-8842. - ISSN 1873-3956
Аннотация: A representative series of samples consisting of fine ε-Fe2O3 nanoparticles uniformly distributed over the SiO2 xerogel matrix with an iron oxide content of 5–33 wt % has been synthesized and studied by mutually complementary physical methods. It has been shown by the X-ray diffractometry and high-resolution electron microscopy examination that, with increasing iron oxide concentration, the average particle size d increases from 4 to 11 nm. According to the X-ray diffractometry and Mӧssbauer spectroscopy data, the samples with an iron oxide content of 5–20 wt % are single-phase, while at the highest Fe2O3 concentration (33 wt %), the β-Fe2O3 and α-Fe2O3 phases arise. As the average particle size d increases, a monotonic increase in coercivity HC and remanent magnetization MR of the synthesized systems at room temperature is observed, which is indicative of their magnetic hysteresis. The magnetic transition known to occur in the ε–Fe2O3 oxide manifests itself in all the investigated samples as a drastic change in the HC and MR values at 150–75 K. At the same time, a thorough analysis of the temperature dependence of the real part of the ac magnetic susceptibility χ′ has shown that the particles with a size smaller than a critical value of dC ∼6.5 nm do not undergo the magnetic transition and have a much lower magnetic anisotropy constant as compared with coarser particles (d dC). It has been found that, in the low-temperature region, the magnetic moments of these fine particles experience superparamagnetic blocking. It has been established that the size effects that arise in ultra-fine ε–Fe2O3 particles has a serious impact on the macroscopic magnetic properties of the highly dispersed systems based on them.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center “Krasnoyarsk Scientific Center”, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia
Siberian Federal University, Krasnoyarsk, 660041, Russia
Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090, Russia

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Knyazev, Yu. V.; Князев, Юрий Владимирович; Semenov, S. V.; Семёнов, Сергей Васильевич; Dubrovskiy, A. A.; Дубровский, Андрей Александрович; Lasukov, A. I.; Ласуков, А. И.; Skorobogatov, S. A.; Скоробогатов, Станислав Алексеевич; Smorodina, E. D.; Смородина, Екатерина Дмитриевна; Kirillov, V. L.; Martyanov, O. N.
}
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Karpov, I. V.
Investigation of the process of structural modification of UHMWPE with CuO nanoparticles on the frequency and temperature dependence of the dielectric characteristics of the composite / I. V. Karpov, L. F. Fedorov, N. A. Drokin // IEEE Trans. Dielectr. Electr. Insul. - 2025, DOI 10.1109/TDEI.2025.3548971. - Cited References: 34. - The work has been performed under the state assignment FWES-2024-0026 . - Article in press. - ISSN 1070-9878. - ISSN 1558-4135
Кл.слова (ненормированные):
vacuum arc discharge -- nanocomposites -- copper oxide -- impedance -- dielectric properties
Аннотация: Using vacuum-arc synthesis, Ultra-high molecular weight polyethylene (UHMWPE)/nano CuO composite samples with a CuO nanoparticle content of 0 to 3 wt.% were obtained. It was found that with an increase in the concentration of nanoparticles, their agglomeration is possible. In addition, with an increase in the concentration of CuO nanoparticles, and accordingly an increase in the time of the polymer modification process, some of the non-polar groups ˃ CH2 are converted into polar groups ˃ C=O, which are easily embedded in the UHMWPE crystal lattice. The electrical properties of pure UHMWPE and UHMWPE/CuO composites were studied by impedance spectroscopy in the frequency range from 102 to 108 Hz and temperatures from 300 K to 420 K. It was found that the dielectric properties of the composite with a CuO nanoparticle content of up to 1 wt.% do not undergo any special changes. The permittivity does not depend on frequency, while the dielectric losses are associated only with through conductivity. With increasing temperature, due to thermal expansion of the polymer and a decrease in its density, the permittivity decreases. With an increase in the nanoparticle content from 2 to 3 wt.% at a frequency of 106 Hz, dielectric relaxation in UHMWPE/nano CuO associated with the formation of polar groups is observed. With increasing temperature, dipole polarization is activated. As a result, dielectric losses increase.

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Держатели документа:
Siberian Federal University, Krasnoyarsk, Russia
Federal Research Center Krasnoyarsk Scientific Center of the Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center Krasnoyarsk Scientific Center SB RAS, Krasnoyarsk, Russia

Доп.точки доступа:
Fedorov, L. F.; Drokin, N. A.; Дрокин, Николай Александрович
}
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    Ultrafine Ir-IrO2 nanoparticles for decoration of cobalt phthalocyanine films as an active component for highly sensitive detection of nitric oxide / S. I. Dorovskikh, D. D. Klyamer, P. O. Krasnov [et al.] // Mater. Sci. Eng. B: Solid-State Mater. Adv. Technol. - 2025. - Vol. 314. - Ст. 118074, DOI 10.1016/j.mseb.2025.118074. - Cited References: 69. - The work devoted to the study of the sensor response to NO as well as DFT calculations were supported by the Ministry of Science and Higher Education of Russian Federation (projects 121031700314-5 and FSRZ 2023-0006) . - ISSN 0921-5107. - ISSN 1873-4944
   Перевод заглавия: Ультрамалые наночастицы Ir-IrO2 для декорирования пленок фталоцианина кобальта в качестве активного компонента для высокочувствительного обнаружения оксида азота
Кл.слова (ненормированные):
Ir-IrO nanopaticles -- Cobalt phthalocyanine films -- NO detection -- NOx detection -- DFT calculations
Аннотация: Nitric oxide is an important molecule that plays a crucial role in regulating physiological processes in mammals. To develop a sensitive method for detecting NO, new heterostructures based on cobalt phthalocyanine (CoPc) films decorated with Ir-IrO2 nanoparticles were considered as active layers of chemiresistive sensors for the direct NO detection. Within deposition conditions, Ir-IrO2 nanoparticles with an Ir concentration of 0.48–1.5 µg/cm2, a fraction of IrO2 phase of 10–20 %, and particles sizes from 1 to 3 to 14 nm were obtained on the surface of CoPc films. The influence of these parameters of Ir-IrO2 particles on the sensor response of Ir-IrO2/CoPc heterostructures to NO was investigated using theoretical and practical approaches. Based on DFT calculations, an electronic sensitization mechanism of NO detection by Ir-IrO2/CoPc heterostructures was proposed. These heterostructures are able to detect of NO gas at the ppb level and show the selectively to NOx in the presense of other gases.

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Держатели документа:
Nikolaev Institute of Inorganic Chemistry, SB RAS, Lavrentiev ave. 3, Novosibirsk 630090 Russia
International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, Krasnoyarsk 660074 Russia
Qingdao Innovation and Development Center, Harbin Engineering University, Qingdao 266500 China
Rzhanov Institute of Semiconductor Physics SB RAS, 13 Lavrentiev Ave. 630090 Novosibirsk, Russia
Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5 630090 Novosibirsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50/38, Krasnoyarsk 660036 Russia
Laboratory of Electron Microscopy, Siberian Federal University, 79 Svobodny pr., Krasnoyarsk 660041 Russia

Доп.точки доступа:
Dorovskikh, S. I.; Klyamer, D. D.; Krasnov, P. O.; Shutilov, R. A.; Nasimov, D. A.; Prosvirin, I. P.; Volchek, V. V.; Zharkov, S. M.; Жарков, Сергей Михайлович; Khubezhov, S. A.; Morozova, N. B.; Basova, T. V.
}
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10.

Effect of surfactants and polymer composition on the characteristics of polyhydroxyalkanoate nanoparticles / A. Dorokhin, S. Lipaikin, G. Ryltseva [et al.] // ADMET DMPK. - 2025. - Vol. 13, Is. 3. - Ст. 2723, DOI 10.5599/admet.2723. - Cited References: 86. - The study was funded by State Assignment of the Ministry of Science and Higher Education of the Russian Federation (project No. FWES-2021-0025) . - ISSN 1848-7718
Кл.слова (ненормированные):
P3HB -- P3HBV -- polyvinyl alcohol -- Tween 80 -- sodium deoxycholate -- sodium dodecyl sulfate
Аннотация: Background and purpose: Polyhydroxyalkanoates (PHAs) are biodegradable polyesters of bacterial origin that are actively studied as matrices for the preparation of nanoparticulate drug delivery systems. The most significant parameters affecting PHAs nanoparticles (NPs) characteristics are polymer composition and the type of surfactant used to stabilize the emulsion during NPs preparation. However, there are only a few studies in the literature investigating the effect of these factors on the characteristics of PHA NPs. Experimental approach: Blank poly(3-hydroxybutyrate) (P3HB) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P3HBV) NPs were produced and characterized in terms of their size, morphology and zeta potential. Poly(vinyl alcohol) (PVA) with various molecular weights (31-50 and 85-124 kDa), as well as Tween 20 (TW20), Tween 80 (TW80), sodium deoxycholate (SDC) and sodium dodecyl sulphate (SDS) were used as surfactants. For NPs that formed stable aqueous suspensions and had the most desirable characteristics (P3HB/PVA31-50 and P3HBV/PVA31-50), hemolytic activity and cytotoxicity to HeLa and C2C12 cells in vitro were determined. Key results: NPs of both P3HB and P3HBV obtained using PVA with the Mw of 31-50 kDa as a surfactant had regular spherical shape, uniform size distribution, average diameter of about 900 nm and zeta potential of -28.5 and -28.7 mV, respectively. PVA85-124, TW20 and TW80, as well as SDC and SDS as surfactants, did not show satisfactory results due to suspension gelation, formation of hollow NPs with irregular shape and poor resuspension after washing and freeze-drying, respectively. P3HB/PVA31-50 and P3HBV/PVA31-50 NPs did not have hemolytic activity and did not show pronounced cytotoxicity to HeLa and C2C12 cells in the concentration range from 10 to 500 ?g mL-1, so these samples were regarded as safe and biocompatible. Conclusion: In this study, the effect of various non-ionic and anionic surfactants on the characteristics of P3HB and P3HBV NPs was investigated. PVA31-50 was found to be effective in producing NPs of both studied polymers with good biocompatibility and favorable characteristics, making them suitable for drug delivery applications. In contrast, other studied surfactants, i.e., PVA85-124, TW20, TW80, SDC and SDS, require further investigation. The obtained findings may promote the development of novel PHA-based nanomedicines.

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Держатели документа:
Siberian Federal University, 79 Svobodny pr., Krasnoyarsk 660041, Russia
L.V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, 50/12 Akademgorodok, Krasnoyarsk 660036, Russia
Institute of Biophysics SB RAS, Federal Research Center "Krasnoyarsk Science Center SB RAS", 50/50 Akademgorodok, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Dorokhin, A.; Lipaikin, S.; Ryltseva, G.; Shabanov, A. V.; Шабанов, Александр Васильевич; Sapozhnikova, K.; Volova, T.; Kachin, S.; Shishatskaya, E.
}
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11.

Effect of synthetic and biogenic iron oxide nanoparticles on histopathological parameters of mouse kidneys / A. V. Kireeva, O. A. Kolenchukova, E. A. Biryukova, S. V. Stolyar // J. Evol. Biochem. Physiol. - 2025. - Vol. 61, Is. 1. - P. 261-272, DOI 10.1134/S0022093025010211. - Cited References: 33. - This work was supported by ongoing federal budget funding to the Scientific Research Institute of Medical Problems of the North (FWES 2024-0016) . - ISSN 0022-0930. - ISSN 1608-3202
Кл.слова (ненормированные):
mouse kidney -- ferrihydrite nanoparticles -- oral administration -- morphometric parameters -- histological examination
Аннотация: The unique physical, chemical and magnetic properties of ironoxide nanoparticles (INPs) open up wide prospects for the use ofnanomaterials in the diagnosis and therapy of various diseases.Despite the high interest from the scientific community, the mechanismof the effect of INPs on the physiology of living organisms hasnot been fully investigated. This is not least due to the fact thatthe toxicity of nanoparticles depends on multiple factors, includingtheir size, method of synthesis, and the presence of a shell. Thiswork was aimed to study the effect of synthetic and biogenic ferrihydriteINPs on the mouse kidney morphology, depending on the method oftheir synthesis and the presence of a polysaccharide shell afteroral administration. The animals (n =55) were allocated into 3 groups: group 1 (n =15)—control mice, fed food without INP supplementation; group 2(n = 20)—experimental mice,fed food supplemented with synthetic uncoated INPs; group 3 (n = 20)—experimental mice, fed food supplementedwith encapsulated biogenic INPs. The biological material (mousekidney) was sampled for standard histological examination a daybefore the onset of feeding with INP supplementation, as well as ondays 22 and 36 after that. It was found that long-term administrationof both synthetic and biogenic INPs was accompanied by hemodynamicdisorders in the kidney, as well as dystrophic and necrotic alterationsin renal parenchymal cells, leading to the development of renalfailure. Biogenic INPs displayed a highest reactivity, which isprobably due to the presence of a polysaccharide shell and the crystallinestructure of the ferrihydrite core.

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Публикация на русском языке Воздействие наночастиц оксида железа синтетического и биогенного происхождения на гистопатологические параметры почки мышей [Текст] / А. В. Киреева, О. А. Коленчукова, Е. А. Бирюкова, С. В. Столяр. - 14 с. // Рос. физиол. журн. им. И.М. Сеченова. - 2025. - Т. 111 № 3. - С. 508-521

Держатели документа:
Krasnoyarsk Science Center, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russia
Scientific Research Institute of Medical Problems of the North, Krasnoyarsk Science Center, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk, Russia
Siberian Federal University, Krasnoyarsk, Russia
Krasnoyarsk State Agricultural University, Krasnoyarsk, Russia

Доп.точки доступа:
Kireeva, A. V.; Kolenchukova, O. A.; Biryukova, E. A.; Stolyar, S. V.; Столяр, Сергей Викторович
}
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12.

Shell structure, magnetic and magnetodynamic properties of oxidized iron nanoparticles with partial gold coating / S. Lyaschenko, I. Tarasov, T. Andryushchenko [et al.] // New J. Chem. - 2025. - Vol. 49, Is. 5. - P. 1619-1630, DOI 10.1039/D4NJ05015K. - Cited References: 63 . - ISSN 1144-0546. - ISSN 1369-9261
Аннотация: Magnetic nanoparticles, consisting of a metallic iron core with a shell of gold and iron oxides, were synthesized by ultra-high vacuum surface nucleation on a water-soluble NaCl substrate followed by oxidation in water. Using the methods of electron microscopy, electron diffraction, photoelectron spectroscopy and calculation of the specific density of iron in the oxidized shell, the oxides γ-Fe2O3, Fe3O4 and oxyhydroxide α-FeO(OH) were discovered. A non-uniform distribution of the Fe3+/Fe2+ ion ratio over the particle depth and a predominance of α-FeO(OH) in the contrast shell of nanoparticles, directly observed in transmission electron microscopy, were discovered. Comparison of the magnetic properties of partially gold-coated particles with similar Fe particles without gold showed a larger residual volume of unoxidized metal core with partial gold coating. This points to the anisotropy of the surface chemical properties associated with the Janus-like structure. For the first time, the magnetodynamic properties of partially gold-coated Fe nanoparticles were assessed by ellipsometric measurements of the surface of a colloidal solution in a gradient magnetic field.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Krasnoyarsk Scientific Center, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
National Research Lobachevsky State University of Nizhny Novgorod, Nizhny Novgorod, Russia

Доп.точки доступа:
Lyashchenko, S. A.; Лященко, Сергей Александрович; Tarasov, I. A.; Тарасов, Иван Анатольевич; Andryushchenko, T. A.; Андрющенко, Татьяна Александровна; Yakovlev, I. A.; Яковлев, Иван Александрович; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Volochaev, M. N.; Волочаев, Михаил Николаевич; Nemtsev, I. V.; Немцев, Иван Васильевич; Kriukov, R.; Maximova, O. A.; Максимова, Ольга Александровна; Shevtsov, D. V.; Шевцов, Дмитрий Валентинович; Varnakov, S. N.; Варнаков, Сергей Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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13.

Fe3O4/Au nanocomposites: Characterization and cytotoxicity effects in vitro / R. N. Yaroslavtsev, A. V. Tyumentseva, D. A. Velikanov [et al.] // Mater. Chem. Phys. - 2024. - Vol. 322. - Ст. 129524, DOI 10.1016/j.matchemphys.2024.129524. - Cited References: 44 . - ISSN 0254-0584. - ISSN 1879-3312
Кл.слова (ненормированные):
Magnetic nanoparticles -- Magnetite -- Gold nanoparticles -- Cytotoxicity
Аннотация: Magnetic nanocomposites containing iron oxide and gold components take great attention last years because of their relative biocompatibility and the ability to combine the magnetic properties of iron and the chemical bonding properties of gold for the possible drug delivery or diagnostics for various diseases. However, such particles have some toxicity to living cells, and the effect depends on many factors, including size, shape, the ratio of components in the composites, and the type of cells affected. And thus, the search for compositions and technologies for producing iron-gold particles with improved properties and reduced cytotoxicity remains relevant. The aim of the study was to synthesize and characterize Fe3O4/Au nanocomposites and evaluate their influence on living cells using the example of cell line HEK293. Fe3O4 nanoparticles (NPs) were synthesized by co-precipitation of Fe2+/Fe3+ water solution in alkaline conditions and then boiled with HAuCl4 in 0.1 M sodium citrate. The NPs properties were estimated by transmission electron microscopy (TEM), vibration magnetometry and ferromagnetic resonance (FMR). According to magnetometric measurements, nanoparticles are mainly in a superparamagnetic state. By fitting magnetization curves, the magnetic characteristics of nanoparticles were determined: saturation magnetization (59.3 emu/g) and magnetic anisotropy constant (K = 0.86·105 erg/cm3). The average particle size estimated from magnetic measurements was 8.7 nm. Considering the presence of a magnetically dead layer, this is in good agreement with the TEM results. The temperature dependence of the FMR linewidth was analyzed using two models. As a result, the parameters MSV and K/MS were determined. The models used showed good agreement. The values of the anisotropy constant (K = 1.06·105 erg/cm3) and the average particle size (6.8 nm) are estimated. The effect of the NPs on the HEK293 cells was studied by MTT-assay, flow cytometry and RT-PCR. The exposure with the NPs lead to a significant decrease of cell metabolic activity in HEK293 cell culture, but this effect was not accompanied by cell death. It was shown that the expression of antioxidant enzymes SOD1 and GPX1 was reduced at the mRNA stage. So the NPs synthesized may affect gene expression and metabolism of HEK293 cells, but this does not have fatal consequences for cell viability.

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Держатели документа:
Krasnoyarsk Science Center, Federal Research Center KSC SB RAS, Akademgorodok 50, Krasnoyarsk, 660036, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, bld. 38, Krasnoyarsk, 660036, Russia

Доп.точки доступа:
Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Tyumentseva, A.V.; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Vazhenina, I. G.; Важенина, Ирина Георгиевна; Volochaev, M. N.; Волочаев, Михаил Николаевич; Stolyar, S. V.; Столяр, Сергей Викторович
}
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14.

Fenton reaction-driven pro-oxidant synergy of ascorbic acid and iron oxide nanoparticles in MIL-88B(Fe) / L. Bondarenko, R. Baimuratova, A. Dzeranov [et al.] // New J. Chem. - 2024. - Vol. 48, Is. 22. - P. 10142-10160, DOI 10.1039/D4NJ00963K. - Cited References: 94. - This research was funded by the Russian Science Foundation, grant number 22-73-10222. XPS spectra of the FeO-AA MOF sample were recorded on the equipment of the shared core facilities "Center of physical and physicochemical methods of analysis, investigations of properties and characteristics of surface, nanostructures, materials and products" of the Udmurt Federal Research Center of UB RAS. The Mossbauer analysis was performed in accordance with the state order of Lomonosov Moscow State University "Solving of problems of nuclear energy and environmental safety, as well as diagnostics of materials using ionizing radiation" (project no. 122030200324-1) . - ISSN 1144-0546. - ISSN 1369-9261
Аннотация: MIL-88B, a promising Fe-based 3D porous metal–organic framework (MOF) catalyst for the Fenton reaction, requires modifications to enhance its pro-oxidant activity and enable magnetic control of the sample. This study reports the successful modification of MIL-88B with iron oxide (Fe3O4) and ascorbic acid (AA). The characterization of the crystal structure and morphology of the Fe3O4–AA MOF sample using X-ray diffraction, Raman and Mossbauer spectroscopy, and scanning electron microscopy revealed that AA facilitated the formation of magnetite with a composition approaching a stoichiometry of Fe2.96O4 while preserving the MOF structure. Specifically, in the presence of hydrogen peroxide (H2O2), Fe3O4–AA–MOF exhibited a 3-fold increase in the Fenton reaction rate for methylene blue degradation compared to the conventional homogeneous system at pH 4.5. Furthermore, Fe3O4–AA–MOF retained the antibacterial properties of AA, as evidenced by its ability to increase reactive oxygen species in luminescent marine bacterium Photobacterium phosphoreum at low concentrations while exhibiting moderate cytotoxicity. The enhanced pro-oxidant activity of the Fe3O4–AA–MOF/H2O2 system is attributed to an AA-promoted surface Fe2+/Fe3+ cycle. A possible mechanism for this system is proposed.

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Держатели документа:
Moscow Aviation Institute (National Research University), Moscow, Russia
Sklifosovsky Research Institute for Emergency Medicine, Moscow, Russia
Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Russian Academy of Sciences, Chernogolovka, Moscow region, Russia
Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
Institute of Biophysics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 660036 Krasnoyarsk, Russia
Institute of Physics SB RAS, Federal Research Center “Krasnoyarsk Science Center SB RAS”, 660036 Krasnoyarsk, Russia
Siberian Federal University, 660041 Krasnoyarsk, Russia
Udmurt Federal Research Center of UB RAS, Izhevsk, Russia

Доп.точки доступа:
Bondarenko, L.; Baimuratova, R.; Dzeranov, A.; Pankratov, D.; Kicheeva, A.; Sushko, E.; Сушко, Екатерина Сергеевна; Kudryasheva, N.; Valeev, R.; Tropskaya, N.; Dzhardimalieva, G.; Kydralieva, K.
}
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15.

Influence of arabinogalactan-coated selenium nanoparticles on the formation of free radicals in Ehrlich ascites carcinoma cells / K. V. Shadrin, Yu. A. Yakovleva, O. V. Kryukova [et al.] // BioNanoScience. - 2024. - Vol. 14, Is. 1. - P. 268-275, DOI 10.1007/s12668-023-01251-6. - Cited References: 40 . - ISSN 2191-1630. - ISSN 2191-1649
Кл.слова (ненормированные):
Selenium -- Nanoparticles -- Microwave radiation -- Antioxidant properties -- Ehrlich ascitic carcinoma
Аннотация: The antioxidant properties of selenium nanoparticles coated with arabinogalactan have been studied. The nanoparticles were characterized by transmission electron microscopy and infrared spectroscopy. Arabinogalactan-coated selenium nanoparticles were incubated together with Ehrlich ascitic carcinoma cells and then exposed to microwave radiation. The antioxidant properties of selenium nanoparticles were evaluated using chemiluminescent analysis. The viability of Ehrlich ascitic carcinoma cells under microwave irradiation and incubation with selenium nanoparticles was assessed by flow cytometry. Under conditions of exposure to experimental tumor cells of microwave radiation, the concentration of free radicals in the cells did not change. The effect of arabinogalactan-coated selenium nanoparticles on tumor cells is expressed as an increase in the delay time for the activation of the antioxidant system.

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Держатели документа:
Professor V.F. Voino-Yasenetsky Krasnoyarsk State Medical University, P. Zeleznyak street, 1, 660022, Krasnoyarsk, Russia
Krasnoyarsk Science Center, Federal Research Center KSC SB RAS, Akademgorodok 50, 660036, Krasnoyarsk, Russia
Siberian Federal University, Svobodny, 79, 660041, Krasnoyarsk, Russia
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Akademgorodok 50, bld. 38, 660036, Krasnoyarsk, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, 660036, Krasnoyarsk, Russia

Доп.точки доступа:
Shadrin, K. V.; Yakovleva, Yu. A.; Kryukova, O. V.; Makarskaya, G. V.; Tarskikh, S. V.; Pyankov, V. F.; Pakhomova, V. G.; Gerasimova, Yu. V.; Герасимова, Юлия Валентиновна; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Vorobyev, S. A.; Stolyar, S. V.; Столяр, Сергей Викторович
}
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16.

Adsorption and Catalytic Properties of Nanoparticles Fe3O4-Ag in Relation to Various Types of Organic Dyes / O. S. Ivanova, I. S. Edel'man, E. S. Sventitsky [et al.] // XII lnternational conference "Mechanisms of catalvtic reactions" : abstracts. - Novosibirsk, 2024. - Ст. PP-09. - P. 174-175. - Библиогр.: 2. - РНФ и Красноярский краевой фонд науки, проект 23-22-10025 . - ISBN 978-5-906376-56-5

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS
Siberian Federal University

Доп.точки доступа:
Ivanova, O. S.; Иванова, Оксана Станиславовна; Edel'man, I. S.; Эдельман, Ирина Самсоновна; Sventitsky, E. S.; Serdyuk, A. A.; Toropova, E. S.; "Mechanisms of catalytic reactions", International conference(12 ; 2024 ; June 17-21 ; Vladimir); "Механизмы каталитических реакций", международная конференция(12 ; 2024 ; 17-21 июня ; Владимир); Институт катализа им. Г.К. Борескова Сибирского отделения РАН; Институт органической химии им. Н.Д. Зелинского РАН; Московский государственный университет им. М.В. Ломоносова; Сибирское отделение РАН; Центр компетенций НТИ "Водород как основа низкоуглеродной экономики"
}
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17.

    Эволюция фазового состава и магнитных свойств композита на основе наночастиц ε-Fe2O3, иммобилизированных в ксерогель SiO2, при увеличении концентрации оксида железа и магнитные свойства наночастиц ε-Fe2O3, извлеченных из композита ε-Fe2O3/ксерогель / А. А. Дубровский, С. В. Семенов, Ю. В. Князев [и др.] // Новое в магнетизме и магнитных материалах : сборник трудов XXV международной конференции / прогр. ком.: Р. С. Исхаков, С. Г. Овчинников [и др.]. - 2024. - Секция 9 [Сборник 9] : Магнитные наноструктуры. Малые магнитные частицы. - С. 120-123. - Библиогр.: 4. - РНФ, Красноярский краевой фонд науки, грант № 24-12-20011 . - ISBN 978-5-4465-1869-2
   Перевод заглавия: Evolution of the phase composition and magnetic properties of a composite based on ε-Fe2O3 nanoparticles immobilized in SiO2 xerogel with increasing iron oxide concentration and magnetic properties of ε-Fe2O3 nanoparticles extracted from the ε-Fe2O3/xerogel composite
Аннотация: ε-Fe2O3 является достаточно редкой полиморфной модификацией оксида железа и существует только в виде наночастиц. Как и во всех наноструктурах, поверхностные и размерные эффекты играют важную роль в проявляемых магнитных свойствах. В данной работе мы исследовали эволюцию фазового состава и магнитных свойств композита на основе наночастиц ε-Fe2O3, иммобилизированных в ксерогель SiO2, при увеличении концентрации оксида железа и сопутствующего данному увеличению роста размеров наночастиц оксида железа, а также магнитные свойства наночастиц ε-Fe2O3, извлеченных из композита ε-Fe2O3/ксерогель.

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Держатели документа:
Институт физики им. Л.В. Киренского Сибирского отделения Российской академии наук - обособленное подразделение ФИЦ КНЦ СО РАН
Институт катализа им. Г. К. Борескова СО РАН

Доп.точки доступа:
Исхаков, Рауф Садыкович \прогр. ком.\; Iskhakov, R. S.; Овчинников, Сергей Геннадьевич \прогр. ком.\; Ovchinnikov, S. G.; Дубровский, Андрей Александрович; Dubrovskii, A. A.; Семенов, Сергей Васильевич; Semenov, S. V.; Князев, Юрий Владимирович; Knyazev, Yu. V.; Кириллов, В. Л.; Балаев, Дмитрий Александрович; Balaev, D. A.; Мартьянов, Олег Николаевич; "Новое в магнетизме и магнитных материалах", международная конференция(25 ; 2024 ; 1-6 июля ; Москва); Научный совет по физике конденсированных сред РАН; МИРЭА - Российский технологический университет; Московский государственный университет им. М.В. Ломоносова; Магнитное общество России
}
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18.

    Наночастицы Fe0.55Co2.45O4: синтез, магнитные и адсорбционные свойства / О. С. Иванова, И. С. ЭдельманLin Chun-Rong [и др.] // Новое в магнетизме и магнитных материалах : сборник трудов XXV международной конференции / прогр. ком.: Р. С. Исхаков, С. Г. Овчинников [и др.]. - 2024. - Секция 1 [Сборник 1] : Новые магнитные и родственные им материалы: синтез и физические свойства. Преподавание по разделам «Магнетизм» и «Магнитные материалы» в высшей школе. - С. 4-6. - Библиогр.: 5. - РНФ, Красноярский краевой фонд науки, грант № 23-22-10025 . - ISBN 978-5-4465-1869-2
   Перевод заглавия: Fe0.55Co2.45O4 nanoparticles: synthesis, magnetic and adsorption properties
Аннотация: Наночастицы Fe0.55Co2.45O4 синтезированы методом самовозгорания в растворе и подвергнуты термообработке различной длительности при различных температурах Ttreat от 400 до 800 °C. Как исходные наночастицы, то есть, частицы непосредственно после синтеза, так и прошедшие термообработку являются нанокристаллами шпинели с параметрами, характерными для Co3O4. Температура Ttreat критически влияет на размеры нанокристаллов и их свойства. Размеры нанокристаллов монотонно возрастают с увеличением Ttreat от 5.2 нм в исходном образце до 48 нм при Ttreat =800 °C. Намагниченность и спектры магнитного кругового дихроизма при этом также очень сильно изменяются, но немонотонно. Обнаружена высокая адсорбционная емкость наночастиц по отношению к анионному красителю Конго красный.

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Держатели документа:
Институт физики им. Л.В. Киренского Сибирского отделения Российской академии наук - обособленное подразделение ФИЦ КНЦ СО РАН
Сибирский федеральный университет
National Pingtung University, Pingtung, Taiwan, R.O.C.

Доп.точки доступа:
Исхаков, Рауф Садыкович \прогр. ком.\; Iskhakov, R. S.; Овчинников, Сергей Геннадьевич \прогр. ком.\; Ovchinnikov, S. G.; Иванова, Оксана Станиславовна; Ivanova, O. S.; Эдельман, Ирина Самсоновна; Edelman, I. S.; Lin Chun-Rong; Петров, Дмитрий Анатольевич; Petrov, D. A.; Торопова, Е. С.; Сухачев, Александр Леонидович; Sukhachev, A. L.; "Новое в магнетизме и магнитных материалах", международная конференция(25 ; 2024 ; 1-6 июля ; Москва); Научный совет по физике конденсированных сред РАН; МИРЭА - Российский технологический университет; Московский государственный университет им. М.В. Ломоносова; Магнитное общество России
}
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19.

Separating the contributions of the magnetic subsystems in antiferromagnetic ferrihydrite nanoparticles by analyzing the magnetization in fields of up to 250 kOe / A. A. Krasikov, D. A. Balaev, A. D. Balaev [et al.] // J. Magn. Magn. Mater. - 2024. - Vol. 592. - Ст. 171781, DOI 10.1016/j.jmmm.2024.171781. - Cited References: 84. - This study was supported by his work was supported by the Russian Science Foundation, project no. 22–72-00134. - Authors thank to D.A. Velikanov, S.V. Komogortsev for fruitful discussions . - ISSN 0304-8853. - ISSN 1873-4766
Аннотация: Contributions of different magnetic subsystems formed in the systems of synthetic ferrihydrite nanoparticles (characterized previously) with an average size of ˂d˃ ≈ 2.7 nm coated with polysaccharide arabinogalactan in different degrees have been separated by measuring the dependences of their magnetization M on magnetic field H of up to 250 kOe on vibrating sample and pulsed magnetometers. The use of a wide measuring magnetic field range has been dictated by the ambiguity in identifying a linear M(H) portion for such antiferromagnetic nanoparticle systems within the conventional field range of 60–90 kOe. The thorough analysis of the magnetization curves in the temperature range of 100–250 K has allowed the verification of the contributions of (i) uncompensated magnetic moments µun in the superparamagnetic subsystem, (ii) the subsystem of surface spins with the paramagnetic behavior, and (iii) the antiferromagnetic susceptibility of the antiferromagnetically ordered ferrihydrite particle core. As a result, a model of the magnetic state of ferrihydrite nanoparticles has been proposed and the numbers of spins corresponding to magnetic subsystems (i)–(iii) have been estimated. An average magnetic moment μun of ∼ 145 μB (μB is the Bohr magneton) per particle corresponds approximately to 30 decompensated spins of iron atoms in a particle (about 3 % of all iron atoms), which, according to the Néel’s hypothesis μun ∼ ˂d˃3/2, are localized both on the surface and in the bulk of an antiferromagnetically ordered particle. The fraction of free (paramagnetic) spins is minimal in the sample without arabinogalactan coating of the nanoparticle surface (7 %) and is attained 20 % of all iron atoms in the sample with the highest degree of spatial separation of particles. According to this estimation, paramagnetic spins are located mainly on the edges and protruding areas of particles. Most magnetic moments of iron atoms are ordered antiferromagnetically and the corresponding magnetic susceptibility of this subsystem behaves as in an antiferromagnet with the randomly distributed crystallographic axes, i.e., increases with temperature.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center of Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russia
Federal Research Center of Siberian Branch of Russian Academy of Sciences Krasnoyarsk, Russia

Доп.точки доступа:
Krasikov, A. A.; Красиков, Александр Александрович; Balaev, D. A.; Балаев, Дмитрий Александрович; Balaev, A. D.; Балаев, Александр Дмитриевич; Stolyar, S. V.; Столяр, Сергей Викторович; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
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20.

Magnetic collective state formation upon tuning the interparticle interactions in ensembles of ultrafine ferrihydrite nanoparticles / D. A. Balaev, A. A. Krasikov, Yu. V. Knyazev [et al.] // Nano-Struct. Nano-Objects. - 2024. - Vol. 37. - Ст. 101089, DOI 10.1016/j.nanoso.2023.101089. - Cited References: 93. - The authors thank M.N. Volochaev for the TEM investigations . - ISSN 2352-507X. - ISSN 2352-5088
Кл.слова (ненормированные):
Nanoparticle coating -- Superspin-glass state -- Superparamagnetic blocking -- Surface spin subsystem
Аннотация: The results of a study of the dynamic (alternating current magnetic susceptibility) and static magnetic properties, as well as 57Fe Mössbauer spectrometry and ferromagnetic resonance of two-line ferrihydrite nanoparticle systems with varying intensities of magnetic interparticle interactions are reported. The strength of the magnetic interparticle interactions has been tuned by coating (with various degrees of coating) the ferrihydrite particles (2–4 nm in size and an average size ∼2.7 nm) of the initial synthetic sample by arabinogalactan. Also, a biogenic ferrihydrite sample (an average particle size of 2-nm) with a natural organic coating was studied and it has the weakest magnetic interparticle interactions among of all the samples. Relaxation times of the particle’s magnetic moment were determined by the data of static and dynamic magnetic susceptibilities and from analysis of 57Fe Mössbauer spectrometry. Based on the temperature dependences of the relaxation times, it has been concluded that the predominantly collective processes of freezing of the particle magnetic moments occur under the action of the magnetic interparticle interactions. It is shown that an important role in these processes is played by a magnetic subsystem of the surface spins of the particles. The effect of the interplay between the surface spin and magnetic moment subsystems on the static magnetic properties (low-temperature magnetic hysteresis loops) and the parameters of the microwave absorption line under the magnetic resonance conditions is discussed.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia
Institute of Chemistry and Chemical Technology, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Balaev, D. A.; Балаев, Дмитрий Александрович; Krasikov, A. A.; Красиков, Александр Александрович; Knyazev, Yu. V.; Князев, Юрий Владимирович; Yaroslavtsev, R. N.; Ярославцев, Роман Николаевич; Velikanov, D. A.; Великанов, Дмитрий Анатольевич; Mikhlin, Yu. L.; Volochaev, M. N.; Волочаев, Михаил Николаевич; Bayukov, O. A.; Баюков, Олег Артемьевич; Ladygina, V. P.; Stolyar, S. V.; Столяр, Сергей Викторович; Iskhakov, R. S.; Исхаков, Рауф Садыкович
}
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