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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Buktiyarova G.A., Shuvaeva М.А., Bayukov O. A., Yakushkin S.S., Martyanov O.N.
Заглавие : Facile synthesis of nanosized е-РегОз particles on the silica support
Место публикации : J. Nanopart. Res. - 2011. - Vol. 13, Is. 10. - Ст.5527-5534. - DOI 10.1007/sl 1051-011-0542-5
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrilyuk A.P., Karpov S.V.
Заглавие : Dynamic Changes of Optical Characteristics of Resonant Domains in Metal Nanoparticle Aggregates under Pulsed Laser Fields
Место публикации : Applied Physics B: Lasers and Optics. - 2010. - Vol. 101. - С. 512
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Balaev D. A., Stolyar S. V., Knyazev Yu. V., Yaroslavtsev R. N., Pankrats A. I., Vorotynov A. M., Krasikov A. A., Velikanov D. A., Bayukov O. A., Ladygina V. P., Iskhakov R. S.
Заглавие : Role of the surface effects and interparticle magnetic interactions in the temperature evolution of magnetic resonance spectra of ferrihydrite nanoparticle ensembles
Место публикации : Results Phys. - 2022. - Vol. 35. - Ст.105340. - ISSN 22113797 (ISSN), DOI 10.1016/j.rinp.2022.105340
Примечания : Cited References: 119. - Authors thank to A.D. Balaev, S.V. Komogortsev for fruitful discussions and M.N. Volochaev for TEM studies. The TEM study and measurements of X-band FMR spectra were carried out on the equipment of the Krasnoyarsk Territorial Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences. This study was supported by the Russian Science Foundation, project no. 21-72-00025 (https://rscf.ru/project/21-72-00025/) "Tuning the Magnetic Properties of Ultrafine Biocompatible Ferrihydrite Nanoparticles through Interparticle Interactions"
Аннотация: Ferrihydrite is characterized by the antiferromagnetic ordering and, in ferrihydrite nanoparticles, as in nanoparticles of any antiferromagnetic material, an uncompensated magnetic moment is formed. We report on the investigations of ferrihydrite powder systems with an average particle size of ∼ 2.5 nm obtained (i) as a product of the vital activity of bacteria (sample FH-bact) and (ii) by a chemical method (sample FH-chem). In the first approximation, these samples can be considered to be identical. However, in sample FH-chem, particles contact directly, while in sample FH-bact, they have organic shells; therefore, the interparticle magnetic interactions in these samples have different degrees. The main goal of this work has been to establish the effects of the interparticle magnetic interactions and individual characteristics of ferrihydrite nanoparticles on ferromagnetic resonance (FMR) spectra. The FMR spectra have been measured at different (9.4–75 GHz) frequencies in a wide temperature range. It has been found that, at low temperatures, the field-frequency dependence ν(HR) of the investigated systems has a gap ν/γ = HR + HA, where HR is the resonance field and HA is the induced anisotropy, which decreases with increasing temperature. To estimate a degree of the effect of interparticle interactions on the results obtained and to correctly determine the temperature range of the superparamagnetic (or blocked) state, the static magnetic measurement and Mössbauer spectroscopy data have been obtained and analyzed. It has been shown that the most striking feature of the FMR spectra - a gap in the field-frequency dependences - is a manifestation of individual characteristics of ferrihydrite nanoparticles. The induced anisotropy is caused by freezing of a subsystem of surface spins and its coupling with the particle core, which is observed in both samples at a temperature of ∼80 K. The temperature range (below 80 K) in which the gap exists corresponds to the blocked state in the FMR technique. In sample FH-bact, the ratio between the FMR parameters HA and linewidth ΔH obeys the standard expression HA ∼ (ΔH)3. In sample FH-chem, however, the interparticle magnetic interactions dramatically affect the behavior of parameters of the FMR spectra, which change nonmonotonically upon temperature variation. This fact is attributed to the collective freezing of the magnetic moments of particles under the conditions of sufficiently strong interactions, which follows from the temperature dependence of the particle magnetic moment relaxation time determined from the Mössbauer spectroscopy and static magnetometry data obtained in weak magnetic fields.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O. S., Ivantsov R. D., Petrakovskaja E. A., Zabluda V. N., Hennet L., Thiaudiere D., Saboungi M. -L., Stepanov S., Artemenko A., Kliava J.
Заглавие : Nanoparticle-containing oxide glasses: transparent magnets
Коллективы : International Conference on the Chemistry of Glasses and Glass-Forming Melts, Society of Glass Techology
Место публикации : Int. Conf. on the Chem. of Glas. and Glass-Form. Melts: In celebration of the 300th Annuversary of the birth of Mikhail Vasilievich Lomonosov, 4-8 Sept., 2011 : abstracts. - 2011. - P.13
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorov A. S., Visotin M. A., Eremkin E. V., Krasnov P. O., Agren H., Polyutov S. P.
Заглавие : Charge-transfer plasmons of complex nanoparticle arrays connected by conductive molecular bridges
Место публикации : Phys. Chem. Chem. Phys. - 2022. - Vol. 24, Is. 32. - P.19531-19540. - ISSN 14639076 (ISSN), DOI 10.1039/d2cp01811j
Примечания : Cited References: 43. - The work is supported (ASF, EVE, POK, and SPP) by the Russian Science Foundation (project no. 18-13-00363)
Аннотация: Charge-transfer plasmons (CTP) in complexes of metal nanoparticles bridged by conductive molecular linkers are theoretically analysed using a statistic approach. The applied model takes into account the kinetic energy of carriers inside the linkers including its dissipation and the Coulomb energy of the charged nanoparticles. The plasmons are statistically investigated for systems containing a large number of complexes of bridged nanoparticles of realistic sizes generated using a simplified molecular dynamics algorithm, where the geometries of the complexes are dependent on the rate of connection of the linkers with the nanoparticles. As illustrated, the distribution of CTP frequencies in the generated nanoparticle complexes is very inhomogeneous. It has a narrow peak, corresponding to CTP plasmons in dimers, and two broad peaks, corresponding mainly to low and high-frequency oscillations in chains of connected nanoparticles. It is found that in general the plasmon frequencies depend inversely on the value of the complex dipole moment of the plasmon oscillation, where the assumption follows that low-frequency plasmons will be more efficiently excited in an external electromagnetic field. To calculate the CTP energy absorption in this field two model modifications are proposed: a system-external electromagnetic field interaction model and a simplified broadening plasmon peak model where the plasmons are calculated at first without damping and where the delta-shaped oscillation peaks are broadened then due to the damping. It is demonstrated that both modifications lead to a wide and almost monotonic absorption in the IR region for all generated systems containing a large number of bridged nanoparticles due to the presence of a large number of CTPs in this region.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Bikbaev R. G., Vetrov S. Y., Timofeev I. V., Shabanov V. F.
Заглавие : Nanoparticle shape optimization for Tamm-plasmon-polariton-based organic solar cells in the visible spectral range
Место публикации : Photonics. - 2022. - Vol. 9, Is. 11. - Ст.786. - ISSN 23046732 (ISSN), DOI 10.3390/photonics9110786
Примечания : Cited References: 28. - The reported study was funded by a grant of the President of the Russian Federation №MK-46.2021.1.2
Аннотация: The effect of the shape of the nanoparticles and the polarization of incident light on the surface current density and the efficiency of an organic solar cell based on the Tamm plasmon polariton is investigated. In the cases of both elongated and flattened nanoparticles, it is shown that the efficiency of such a solar cell is increased when the electric field vector is parallel to the largest axis of the spheroid.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gavrilyuk A.P., Karpov S. V.
Заглавие : Dynamic changes of optical characteristics of resonant domains in metal nanoparticle aggregates under pulsed laser fields
Коллективы : International Conference on Coherent and Nonlinear Optics, International Conference on Lasers, Applications, and Technologies
Место публикации : Technical digest International conference ICONO/LAT 2010. - Казань, 2010. - Ст.ITuQ39
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrilyuk A. P., Karpov S. V.
Заглавие : Processes in resonant domains of metal nanoparticle aggregates and optical nonlinearity of aggregates in pulsed laser fields
Место публикации : Appl. Phys. B-Lasers Opt. - 2009. - Vol. 97, Is. 1. - С. 163-173. - SEP. - ISSN 0946-2171, DOI 10.1007/s00340-009-3592-y
Примечания : Cited Reference Count: 43. - Гранты: Authors are thankful to Prof. V. A. Markel ( University of Pennsylvania) for computation of multipole polarizability of silver nanoparticle bispheres, for the attention to this paper, fruitful discussions and great support. This research was supported by grants: 27.1 of the Presidium of RAS, 9.1 DPS RAS, 5 SB RAS, 3818.2008.3 and 6612.2006.3 of the President of RF ( SS RAS), DSP 2.1.1.1814, 05- 03- 32642 RFBR.Финансирующая организация: [27.1 of the Presidium of RAS]; [9.1 DPS RAS]; [5 SB RAS]; [3818.2008.3]; [6612.2006.3]
Предметные рубрики: SMALL-PARTICLE COMPOSITES
FRACTAL CLUSTERS
SELECTIVE PHOTOMODIFICATION
ABSORPTION-COEFFICIENTS
REFRACTIVE-INDEXES
SILVER
ENHANCEMENT
RESPONSES
GOLD
Ключевые слова (''Своб.индексиров.''): metal nanoparticles--nanosecond pulsed laser--nonlinear refractive index--optical nonlinearity--physical effects--pulsed-laser field--resonant domain--silver nanoparticles--simple physical models--aggregates--laser excitation--nanoparticles--nonlinear optics--organic polymers--pulsed laser applications--refractive index--silver
Аннотация: Optical nonlinearities in aggregates of nanoparticles formed in silver hydrosols (SHs) are studied under pico- and nanosecond pulsed laser excitation. The dependence of the nonlinear refractive index n (2) on the degree of hydrosol aggregation is studied experimentally at the wavelength lambda=1.064 mu m. It is found that n (2) changes sign when the degree of hydrosol aggregation is increased. Various physical effects occurring in resonant domains of the aggregates are analyzed using a simple physical model of two bound silver nanoparticles. The theory takes into account thermal, elastic, electrostatic, and light-induced effects. Experimental results are discussed in the context of this theory.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Edelman I. S., Ivanova O. S., Ivantsov R. D., Velikanov D. A., Zubavichus Y. V., Veligzhanin A. A., Curely J.
Заглавие : Magnetic properties and morphology of ferrite nanoparticle dispersed in glass
Коллективы : Moscow International Symposium on Magnetism
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2011): Book of abstracts. - 2011. - Ст.23OR-B-9. - P.281-282
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Khaydarov R., Gapurova O., Abdukhakimov M., Sadikov I., Garipov I., Krishnamurthy P. T., Zharkov S. M., Zeer G. M., Abolentseva P. A., Prudnikova S. V., Evgrafova S. Y.
Заглавие : Antimicrobial properties of nanofiltration membranes modified with silver nanoparticles
Коллективы : SFU Joint Scientific Center; Ministry of Science and Higher Education of the Russian Federation [FSRZ-2020-0011]
Место публикации : Emerg. Mater. - 2022. - Vol. 5, Is. 5. - P.1477-1483. - ISSN 2522-5731, DOI 10.1007/s42247-021-00330-2. - ISSN 2522-574X(eISSN)
Примечания : Cited References: 31. - The SEM and TEM analysis was carried out in the SFU Joint Scientific Center under the support of the Ministry of Science and Higher Education of the Russian Federation (#FSRZ-2020-0011)
Аннотация: The growth of bacteria and fungi on a nanofiltration (NF) membrane is known to reduce its permeability and lifetime and increase overall energy use. Over the last decade, application of silver nanoparticles (AgNPs) has shown to present a strong potential in preventing biofouling of NF membrane processes. The paper deals with a novel facile method developed to in situ incorporate nanosilver stabilized with the polyhexamethylene biguanide hydrochloride (PHMB) onto the commercial NF membrane surface. The scanning electron microscopy (SEM) investigations confirmed a uniform distribution of AgNPs on the surface of NF membrane although AgNPs tend to agglomerate into nano-sized colloidal clusters. Our results showed that AgNPs had little impact on the performance of the NF membrane, including salt rejection and water permeation properties. To evaluate the antibacterial properties of nanocomposite membranes, a "time-kill" analysis, a microbiological technique for measuring the change in a population of microorganisms under the impact of a specific sample, has been used against representatives of Gram-positive and Gram-negative bacteria. Inductively coupled mass spectrometry (ICP-MS) was used to study kinetics of Ag release from modified NF membrane. Leaching rates of Ag were low that will possibly result in long-established antimicrobial and antifungal properties. The present research offers a potential for its further use as a new type of modified NF membrane mitigating biofouling.
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