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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kliava J., Malakhovskii A. V., Edelman I. S., Potseluyko A. M., Petrakovskaja E. A., Melnikova S.V., Zarubina T. V., Petrovskii G., Bruckental Y., Yeshurun Y.
Заглавие : Unusual magnetic transitions and nature of magnetic resonance spectra in oxide glasses containing gadolinium
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2005. - Vol. 71, Is. 10. - Ст.104406. - ISSN 1098-0121, DOI 10.1103/PhysRevB.71.104406
Примечания : Cited References: 40
Предметные рубрики: ELECTRON-PARAMAGNETIC-RESONANCE
BORATE GLASSES
IONS
BEHAVIOR
GD3+
SPECTROSCOPY
SYSTEMS
GD-3+
FIELD
SHAPE
Ключевые слова (''Своб.индексиров.''): gadolinium--glass--lanthanide--oxide--anisotropy--article--chemical structure--concentration response--electron spin resonance--energy--magnetism--molecular physics--nanoparticle--phase transition--refraction index--temperature sensitivity
Аннотация: Magnetic susceptibility, electron paramagnetic resonance (EPR), and optical properties have been studied in a glass system {20La(2)O(3)-22Al(2)O(3)-23B(2)O(3)-35(SiO2+GeO2)} with a part of La2O3 substituted by Gd2O3 in different concentrations. Positive Weiss constants have been found in the more heavily doped glasses and ascribed to clustering of Gd3+ ions. Two magnetic phase transitions at 55 and 12 K were detected and ascribed, respectively, to ferromagnetic and antiferromagnetic clusters containing Gd ions. The overall shape of the EPR spectra shows the presence of clustering at the higher Gd contents. At low temperatures the cluster-related resonance signal is altered in shape, indicating an onset of magnetic anisotropy field. This signal is convincingly fitted to superparamagnetic resonance arising from ferromagnetic nanoparticles. The clustering, depending on the Gd concentration, correlates with a significant shift to lower energies of the strong optical absorption band edge, ascribed to a charge transfer transition between Gd ions. A nonmonotonous change of refractive index with the increase of the Gd content indicates changes in the glass matrix and in Gd cluster structure.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Fedorov A. S., Kovaleva E. A., Sokolov A. Е., Visotin M. A., Lin C. R., Ovchinnikov S. G.
Заглавие : Trimetallic magnetite-Ti-Au nanoparticle formation: A theoretical approach
Место публикации : Mater. Chem. Phys. - 2021. - Vol. 271. - Ст.124847. - ISSN 02540584 (ISSN), DOI 10.1016/j.matchemphys.2021.124847
Примечания : Cited References: 46. - The reported study was funded by Joint Research Project of Russian Foundation for Basic Research # 19-52-52002 and Ministry of Science and Technology, Taiwan MOST # 109-2112-M-153-003 and # 108-2923-M-153-001-MY3
Аннотация: Geometric, electronic and magnetic structure of planar slabs consisting of magnetite Fe3O4, titanium and gold layers are investigated by DFT-GGA calculations. It is assumed that these slabs can be used to simulate the upper layers of magnetite nanoparticles covered with an intermediate layer of titanium and a gold layer on the surface. Specific energies and spreading parameters (wettability) of the magnetite-gold, magnetite-titanium and titanium-gold interfaces are calculated. The specific energy and spreading parameter of the magnetite-gold interface is found to be negative, while these values of the magnetite-titanium (for thin Ti layer) and magnetite-titan-gold interfaces are significantly positive. This allows us to hope that the intermediate thin layer of titanium at the boundary between the surface of the magnetite nanoparticle and the gold layer stabilizes this three-layer structure and allows obtaining magnetite nanoparticles covered with continuous gold coating.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Semina P. N., Isaev I. L., Komogortsev S. V., Klyuchantsev A. B., Kostyukov A. S., Blagodatova A. V., Khrennikov D. E., Kichkailo A. S., Zamay T. N., Lapin I. N., Sokolov A. Е., Polyutov S. P., Karpov S. V.
Заглавие : Towards understanding the triggering of the malignant cell death in high-efficiency magneto-mechanical anticancer therapy
Место публикации : J. Phys. D. - 2023. - Vol. 56, Is. 6. - Ст.065401. - ISSN 00223727 (ISSN), DOI 10.1088/1361-6463/acb0dd. - ISSN 13616463 (eISSN)
Примечания : Cited References: 146. - P N S, A S K, D E K, S P P, S V K acknowledge the support by the Ministry of Science and High Education of Russian Federation (Project No. FSRZ-2020-0008). Experimental analyses were funded by the Ministry of Science and Higher Education of the Russian Federation (Project FWES-2022-0005) – A S K, T N Z. The authors thank Dr S V Saikova for providing the TEM image in figure (b)
Аннотация: The paper discusses schemes for the implementation of magneto-mechanical anticancer therapy and the most probable scenarios of damaging mechanical eﬀects on the membranes of malignant cells by targeted magnetic nanoparticles selectively bound to membrane mechanoreceptors employing aptamers. The conditions for selective triggering of the malignant cell apoptosis in a low-frequency non-heating alternating magnetic ﬁeld, corresponding to the exceeding threshold value of the force acting on the membrane and its mechanoreceptors, are established using a nanoparticle dynamic simulation. The requirements for the functionality of magnetic nanoparticles and their suitability for biomedical applications are analysed. Attention is paid to the possibility of the formation of magnetite nanoparticle aggregates in an external magnetic ﬁeld and their localization near tumor cell membranes. It is shown that the scenario involving the process of aggregation of magnetite nanoparticles provides a suﬃcient magneto-mechanical impact to achieve a therapeutic eﬀect. A possible explanation for the experimentally established fact of successful application of magneto-mechanical therapy using magnetite nanoparticles is presented, in which complete suppression of the Ehrlich carcinoma in an alternating magnetic ﬁeld as a response to a magnetome-chanical stimulus was demonstrated. This result conﬁrmed the possibility of using the method for high eﬃciency treatment of malignant neoplasms. The paper is provided with an extensive review of key publications and the state of art in this area.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zakomirnyi V. I., Rasskazov I. L., Gerasimov V. S., Ershov A. E., Polyutov S. P., Karpov S. V., Agren H.
Заглавие : Titanium nitride nanoparticles as an alternative platform for plasmonic waveguides in the visible and telecommunication wavelength ranges
Место публикации : Photonics Nanostruc. Fundam. Appl. - 2018. - Vol. 30. - P.50-56. - ISSN 15694410 (ISSN), DOI 10.1016/j.photonics.2018.04.005
Примечания : Cited References: 85. - This work was supported by the RF Ministry of Education and Science, the State contract with Siberian Federal University for scientific research in 2017–2019 and SB RAS Program No II.2P (0358-2015-0010).
Ключевые слова (''Своб.индексиров.''): nanoparticle--titanium nitride--surface plasmon polariton--plasmon waveguide--refractory plasmonics
Аннотация: We propose to utilize titanium nitride (TiN) as an alternative material for linear periodic chains (LPCs) of nanoparticles (NPs) which support surface plasmon polariton (SPP) propagation. Dispersion and transmission properties of LPCs have been examined within the framework of the dipole approximation for NPs with various shapes: spheres, prolate and oblate spheroids. It is shown that LPCs of TiN NPs support high-Q eigenmodes for an SPP attenuation that is comparable with LPCs from conventional plasmonic materials such as Au or Ag, with the advantage that the refractory properties and cheap fabrication of TiN nanostructures are more preferable in practical implementations compared to Au and Ag. We show that the SPP decay in TiN LPCs remains almost the same even at extremely high temperatures which is impossible to reach with conventional plasmonic materials. Finally, we show that the bandwidth of TiN LPCs from non-spherical particles can be tuned from the visible to the telecommunication wavelength range by switching the SPP polarization, which is an attractive feature for integrating these structures into modern photonic devices.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gerasimov V. S., Ershov A. E., Karpov S. V., Gavrilyuk A. P., Zakomirnyi V. I., Rasskazov I. L., Agren H., Polyutov S. P.
Заглавие : Thermal effects in systems of colloidal plasmonic nanoparticles in high-intensity pulsed laser fields [Invited]
Место публикации : Opt. Mater. Express: Optical Society of America, 2017. - Vol. 7, Is. 2. - P.555-568. - ISSN 21593930 (ISSN), DOI 10.1364/OME.7.000555
Примечания : Cited References: 68. - This work was performed within the State contract of the RF Ministry of Education and Science for Siberian Federal University for scientific research in 2017-2019 and SB RAS Program No II.2P (0358-2015-0010). The calculations were performed using the MVS-1000 M cluster at the Institute of Computational Modeling, Federal Research Center KSC SB RAS.
Ключевые слова (''Своб.индексиров.''): aggregates--gold--nanoparticles--plasmons--silver--ag nanoparticle--high intensity--light-induced process--nanoparticle aggregate--physical model--plasmonic nanoparticle--pulsed-laser field--thermal interaction--pulsed lasers
Аннотация: We have studied light induced processes in nanocolloids and composite materials containing ordered and disordered aggregates of plasmonic nanoparticles accompanied by their strong heating. A universal comprehensive physical model that combines mechanical, electrodynamical, and thermal interactions at nanoscale has been developed as a tool for investigations. This model was used to gain deep insight on phenomena that take place in nanoparticle aggregates under high-intensity pulsed laser radiation resulting in the suppression of nanoparticle resonant properties. Verification of the model was carried out with single colloidal Au and Ag nanoparticles and their aggregates. © 2017 Optical Society of America.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gavrilyuk A. P., Karpov S. V.
Заглавие : The model of resonant domain of metal nanoparticle aggregates in pulsed laser fields
Коллективы : ICONO 2007: Novel Photonics Materials; Optics and Optical Diagnostics of Nanostructures
Место публикации : Proceedings of SPIE - The International Society for Optical Engineering/ sponsors: SPIE Russia Chapter, National Academy of Sciences, Belarus, Russian Academy of Sciences, Belarus Foundation for Basic Research, Russian Physical Society ; ICONO 2007: Novel Photonics Materials; Optics and Optical Diagnostics of Nanostructures (2007 ; 28.05 - 01.06 ; Минск): S P I E - International Society for Optical Engineering, 2007. - 6728. - С. 67281T. - ISBN 0819468851, DOI 10.1117/12.752386 (Шифр 15048789)
ГРНТИ : 31.15
РИНЦ,
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gavrilyuk A. P., Gerasimov V. S., Ershov A. E., Karpov S. V.
Заглавие : Temperature dependent elastic repulsion of colloidal nanoparticles with a polymer adsorption layer
Коллективы : Russian Foundation for Basic Research; government of the Krasnoyarsk territory and Krasnoyarsk Regional Fund of Science [18-42-243023]; RF Ministry of Science and Education,; State contract with Siberian Federal University for scientific research in 2017-2019; SB RAS Program [II.2P (0358-2015-0010)]
Место публикации : Colloid Polym. Sci. - 2018. - Vol. 296, Is. 10. - P.1689-1697. - ISSN 0303-402X, DOI 10.1007/s00396-018-4383-y. - ISSN 1435-1536(eISSN)
Примечания : Cited References: 49. - The reported research was funded by the Russian Foundation for Basic Research, the government of the Krasnoyarsk territory and Krasnoyarsk Regional Fund of Science, grant 18-42-243023, the RF Ministry of Science and Education, the State contract with Siberian Federal University for scientific research in 2017-2019, and SB RAS Program No II.2P (0358-2015-0010).
Предметные рубрики: STERICALLY-STABILIZED PARTICLES
DEPLETION FLOCCULATION
AGGREGATION
Ключевые слова (''Своб.индексиров.''): nanoparticle--adsorption layer--elastic deformation--coagulation--kinetics--elasticity modulus
Аннотация: The model of pairwise elastic repulsion of contacting colloidal nanoparticles with a rigid core and deformable shell is discussed. A simple analytical equation is applied for the energy of elastic repulsion of nanoparticles with arbitrary sizes and the elasticity moduli of self-healing polymer adsorption layers. The model is based on the representation of the absorption layer as a continuous medium that is elastically deformed upon the contact of nanoparticles. The major characteristic of this medium is the elasticity modulus. The magnitude of the elasticity modulus is determined from the condition of balance of the van der Waals attractive forces of nanoparticles and the elastic repulsion of their adsorption layers in the contact area, taking into account the temperature variations. We employed the kinetic approach to describe the dependence of the elasticity modulus on both the temperature and the rate of its change.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Burakov V. S., Kiris V. V., Nevar A. A., Nedelko M. I., Tarasenko N. V., Churilov G. N.
Заглавие : Synthesis of nickel–carbon nanoparticles by electrical discharge in liquid
Место публикации : J. Appl. Spectrosc. - 2018. - Vol. 84, Is. 6. - P.1006–1013. - ISSN 00219037 (ISSN), DOI 10.1007/s10812-018-0578-8
Примечания : Cited References: 16
Ключевые слова (''Своб.индексиров.''): electrical discharge in liquid--nickel–carbon nanoparticle
Аннотация: Composite nickel–carbon nanoparticles were synthesized by electrical discharge in liquid. The synthesis was carried out in water and ethanol under various discharge conditions, including purging the discharge gap with argon. In water, electrical discharge was conducted between graphite and nickel electrodes. In ethanol, two nickel electrodes were used with the liquid acting as the carbon supplier. The size of the particles obtained, their composition, and the production rate depend on the type of working fluid and synthesis duration. It was also shown that the particle production rate in water is greater than in ethanol, and purging the electrode gap with argon reduces this rate two or three times.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ershov A. E., Gerasimov V. S., Gavrilyuk A. P., Karpov S. V.
Заглавие : Surface plasmon resonances in liquid metal nanoparticles
Место публикации : Appl. Phys. B: Springer, 2017. - Vol. 123, Is. 6. - Ст.182. - ISSN 09462171 (ISSN), DOI 10.1007/s00340-017-6755-2
Примечания : This work was performed within the State contract of the RF Ministry of Education and Science for Siberian Federal University for scientifc research in 2017–2019. The numerical calculations were performed using the MVS-1000 M cluster at the Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences.
Ключевые слова (''Своб.индексиров.''): aggregates--dimers--gold--liquids--metal nanoparticles--nanoparticles--nonlinear optics--silver--surface plasmon resonance--au nanoparticle--colloidal aggregates--experimental values--experimental verification--metallic nanoparticles--nonlinear optical response--plasmonic nanoparticle--surface plasmon frequency--plasmons
Аннотация: We have shown significant suppression of resonant properties of metallic nanoparticles at the surface plasmon frequency during the phase transition “solid–liquid” in the basic materials of nanoplasmonics (Ag, Au). Using experimental values of the optical constants of liquid and solid metals, we have calculated nanoparticle plasmonic absorption spectra. The effect was demonstrated for single particles, dimers and trimers, as well as for the large multiparticle colloidal aggregates. Experimental verification was performed for single Au nanoparticles heated to the melting temperature and above up to full suppression of the surface plasmon resonance. It is emphasized that this effect may underlie the nonlinear optical response of composite materials containing plasmonic nanoparticles and their aggregates. © 2017, Springer-Verlag Berlin Heidelberg.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Peng J. L., Bulcock S., Belobrov P. I., Bursill L. A.
Заглавие : Surface bonding states of nano-crystalline diamond balls
Место публикации : Int. J. Mod. Phys. B: WORLD SCIENTIFIC PUBL CO PTE LTD, 2001. - Vol. 15, Is. 31. - P4071-4085. - ISSN 0217-9792, DOI 10.1142/S0217979201007865
Примечания : Cited References: 20
Предметные рубрики: PLASMON RESPONSE
POWDER
SPECTROSCOPY
MICROSCOPY
SILICON
SI(111)
Ключевые слова (''Своб.индексиров.''): diamond--article--crystal structure--electron--energy transfer--nanoparticle--particulate matter--structure analysis--surface property--transmission electron microscopy
Аннотация: The rough surface of nano-crystalline diamond spheres induces surface electronic states which appear as a broadened pre-peak over approx. 15 eV at the C K-edge energy threshold for carbon in the parallel electron energy loss spectrum (PEELS). This appears to be at least partially due to 1s-pi* transitions, although typically the latter occupy a range of only 4 eV for the sp(2) edge of highly-oriented pyrollytic graphite (HOPG). No pi* electrons appear in the conduction band inside the diamond particles, where all electrons are sp(3) hybridized. PEELS data were also obtained from a chemical vapour deposited diamond film (CVDF) and gem-quality diamond for comparison with the spectra of nano-diamonds. The density of sp(2) and sp(3) states on the surface of diamond nano-crystals is calculated for simple structural models of the diamond balls, including some conjecture about surface structures. The results are used to interpret the sp(2)/sp(3) ratios measured from the PEELS spectra recorded as scans across the particles. Surface roughness at the atomic scale was also examined using high-resolution transmission electron microscopy (HRTEM) and electron nano-diffraction patterns were used to confirm the crystal structures.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gerasimov V. S., Ershov A. E., Gavrilyuk A. P., Karpov S. V., Agren H., Polyutov S. P.
Заглавие : Suppression of surface plasmon resonance in Au nanoparticles upon transition to the liquid state
Место публикации : Opt. Express: Optical Society of America, 2016. - Vol. 24, Is. 23. - P.26851-26856. - ISSN 10944087 (ISSN), DOI 10.1364/OE.24.026851
Примечания : Cited References: 24. - This work was performed within the State contract of the RF Ministry of Education and Science for Siberian Federal University for scientific research in 2014–2016 (Reference number 1792) and SB RAS Program No II.2P (0358-2015-0010). The numerical calculations were performed using the MVS-1000 M cluster at the Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences.
Ключевые слова (''Своб.индексиров.''): electron scattering--gold--lattice constants--liquids--melting--metal nanoparticles--nanoparticles--surface plasmon resonance--electron phonon couplings--experimental spectra--experimental values--gold nanoparticles--nonlinear optical response--plasmonic nanoparticle--relaxation constants--surface plasmon frequency--plasmons
Аннотация: Significant suppression of resonant properties of single gold nanoparticles at the surface plasmon frequency during heating and subsequent transition to the liquid state has been demonstrated experimentally and explained for the first time. The results for plasmonic absorption of the nanoparticles have been analyzed by means of Mie theory using experimental values of the optical constants for the liquid and solid metal. The good qualitative agreement between calculated and experimental spectra support the idea that the process of melting is accompanied by an abrupt increase of the relaxation constants, which depends, beside electronphonon coupling, on electron scattering at a rising number of lattice defects in a particle upon growth of its temperature, and subsequent melting as a major cause for the observed plasmonic suppression. It is emphasized that observed effect is fully reversible and may underlie nonlinear optical responses of nanocolloids and composite materials containing plasmonic nanoparticles and their aggregates in conditions of local heating and in general, manifest itself in a wide range of plasmonics phenomena associated with strong heating of nanoparticles. © 2016 Optical Society of America.
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kostyukov A. S., Ershov A. E., Gerasimov V. S., Filimonov S. A., Rasskazov I. L., Karpov S. V.
Заглавие : Super-efficient laser hyperthermia of malignant cells with core-shell nanoparticles based on alternative plasmonic materials
Место публикации : J. Quant. Spectrosc. Radiat. Transf. - 2019. - Vol. 236. - Ст.106599. - ISSN 00224073 (ISSN), DOI 10.1016/j.jqsrt.2019.106599
Примечания : Cited References: 57. - The reported study was funded by the RF Ministry of Science and Higher Education , the State contract with Siberian Federal University for scientific research in 2017–2019 (Grant No. 3.8896.2017 ); Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science (Grant No.18-42-243023); A.E. thanks the grant of the President of Russian Federation (agreement 075-15-2019-676 ).
Аннотация: New type of highly absorbing core-shell AZO/Au (aluminum doped zinc oxide/gold) and GZO/Au (gallium doped zinc oxide/gold) nanoparticles have been proposed for hyperthermia of malignant cells purposes. Comparative studies of pulsed laser hyperthermia were performed for Au nanoshells with AZO core and traditional SiO2 (quartz) core. We show that under the same conditions, the hyperthermia efficiency in the case of AZO increases by several orders of magnitude compared to SiO2 due to low heat capacity of AZO. Similar results have been obtained for GZO core which has same heat capacity. Calculations for pico-, nano- and sub-microsecond pulses demonstrate that reduced pulse duration results in strong spatial localization of overheated areas around nanoparticles, which ensures the absence of negative effects to the normal tissue. Moreover, we propose new alternative way for the optimization of hyperthermia efficiency: instead of maximizing the absorption of nanoparticles, we enhance the thermal damage effect on the membrane of malignant cell. This strategy allows to find the parameters of nanoparticle and the incident radiation for the most effective therapy.
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Stolyar S. V., Bayukov O. A., Ladygina V. P., Ischenko L. A., Iskhakov R. S.
Заглавие : Structure and magnetic properties of biogenic ferrihydrite nanoparticles doped with gadolinium
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2013. - Vol. 6, Is. 3. - P.358-365. - ISSN 1997-1397; Журн. СФУ. Сер. "Математика и физика"
Ключевые слова (''Своб.индексиров.''): ferrihydrite nanoparticle--bacterial culture klebsiela oxytoca--mössbauer spectroscopy--gadolinium doping
Аннотация: Bacterial culture Klebsiella oxytoca was grown in a Lovley medium at various concentrations of gadolinium salt. Biogenic magnetic nanoparticles of ferrihydrite were investigated by Mossbauer spectroscopy and magnetization curves were obtained. The results of structural studies showed that iron Fe(5) takes new position when cultivating is carried out in medium with high concentrations of gadolinium. It was found that gadolinium is fit into the crystal structure of ferrihydrite. These results are consistent with the analysis of the magnetization curves.
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15.

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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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ershov A. E., Gavrilyuk A. P., Karpov S. V., Polyutov S. P.
Заглавие : Restructuring of plasmonic nanoparticle aggregates with arbitrary particle size distribution in pulsed laser fields
Место публикации : Chin. Phys. B: IOP, 2016. - Vol. 25, Is. 11. - Ст.117806. - ISSN 16741056 (ISSN), DOI 10.1088/1674-1056/25/11/117806
Примечания : Cited References: 47. - This work was performed within the state contract of the RF Ministry of Education and Science for Siberian Federal University for scientific research in 2016 (Reference number 1792) and SB RAS Program No II.2P (0358-2015-0010). Numerical computations were performed on the cluster MVS-1000 M of the Institute of computational modeling SB RAS.
Ключевые слова (''Своб.индексиров.''): optodynamics--nanoparticle--surface plasmon--laser radiation
Аннотация: We have studied processes of interaction of pulsed laser radiation with resonant groups of plasmonic nanoparticles (resonant domains) in large colloidal nanoparticle aggregates having different interparticle gaps and particle size distributions. These processes are responsible for the origin of nonlinear optical effects and photochromic reactions in multiparticle aggregates. To describe photo-induced transformations in resonant domains and alterations in their absorption spectra remaining after the pulse action, we introduce the factor of spectral photomodification. Based on calculation of changes in thermodynamic, mechanical, and optical characteristics of the domains, the histograms of the spectrum photomodification factor have been obtained for various interparticle gaps, an average particle size, and the degree of polydispersity. Variations in spectra have been analyzed depending on the intensity of laser radiation and various combinations of size characteristics of domains. The obtained results can be used to predict manifestation of photochromic effects in composite materials containing different plasmonic nanoparticle aggregates in pulsed laser fields. © 2016 Chinese Physical Society and IOP Publishing Ltd.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zakomirnyi V. I., Rasskazov I. L., Gerasimov V. S., Ershov A. E., Polyutov S. P., Karpov S. V.
Заглавие : Refractory titanium nitride two-dimensional structures with extremely narrow surface lattice resonances at telecommunication wavelengths
Место публикации : Appl. Phys. Lett.: American Institute of Physics, 2017. - Vol. 111, Is. 12. - Ст.123107. - ISSN 00036951 (ISSN), DOI 10.1063/1.5000726
Примечания : Cited References: 54. - This work was supported by the RF Ministry of Education and Science, the State contract with Siberian Federal University for scientific research in 2017–2019. Numerical calculations were performed using the MVS-1000M system at the Institute of Computational Modeling of the Siberian Branch of the Russian Academy of Sciences.
Ключевые слова (''Своб.индексиров.''): bandwidth--nanoparticles--nanostructures--optical properties--plasmons--q factor measurement--refractory materials--titanium compounds--diffractive grating--electromagnetic response--localized surface plasmon--low cost fabrication--plasmonic nanoparticle--telecommunication bandwidth--telecommunication wavelengths--two-dimensional structures--titanium nitride
Аннотация: Regular arrays of plasmonic nanoparticles have brought significant attention over the last decade due to their ability to support localized surface plasmons (LSPs) and exhibit diffractive grating behavior simultaneously. For a specific set of parameters (i.e., period, particle shape, size, and material), it is possible to generate super-narrow surface lattice resonances (SLRs) that are caused by interference of the LSP and the grating Rayleigh anomaly. In this letter, we propose plasmonic structures based on regular 2D arrays of TiN nanodisks to generate high-Q SLRs in an important telecommunication range, which is quite difficult to achieve with conventional plasmonic materials. The position of the SLR peak can be tailored within the whole telecommunication bandwidth (from ≈ 1.26 μm to ≈ 1.62 μm) by varying the lattice period, while the Q-factor is controlled by changing nanodisk sizes. We show that the Q-factor of SLRs can reach a value of 2 × 103, which is the highest reported Q-factor for SLRs at telecommunication wavelengths so far. Tunability of optical properties, refractory behavior, and low-cost fabrication of TiN nanoparticles paves the way for manufacturing cheap nanostructures with extremely stable and adjustable electromagnetic response at telecommunication wavelengths for a large number of applications.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Churilov G. N., Osipova I. V., Vnukova N. G., Glushchenko G. A., Petrakovskaya E. A., Kolonenko A. L., Chiganov A. S., Tomashevich Y. V., Zhyzhaev A. M.
Заглавие : Processing of detonation diamonds with metal-containing high-frequency arc plasma and their properties
Место публикации : Fuller. Nanotub. Carbon Nanostruct.: Taylor & Francis, 2012. - Vol. 20, Is. 4/7 SI. - P.611-615. - ISSN 1536-383X, DOI 10.1080/1536383X.2012.657014
Примечания : Cited References: 5. - The work was partially supported by RFBR foundation (project 09-03-00383).
Ключевые слова (''Своб.индексиров.''): nanodiamond--nanoparticle--metal-containing plasma
Аннотация: This paper describes coating of diamond powder with metal by plasma. Arc plasma was generated in double jet high-frequency argon-operated plasmatron with atomized metal inserts. The diamond powder was added to the plasma in a flow of helium. Copper and nickel coated particles of detonation and industrial diamonds were studied by XRD, XPS, SEM methods and electron magnetic resonance. Results of these studies are presented.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ershov A. E., Gerasimov V. S., Isaev I. L., Gavrilyuk A. P., Karpov S. V.
Заглавие : Processes underlying the laser photochromic effect in colloidal plasmonic nanoparticle aggregates*
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR); Government of the Krasnoyarsk Territory [18-42-243023]; Krasnoyarsk Regional Fund of Science [18-42-243023]; RF Ministry of Science and Higher Education; Siberian Federal University for Scientific Research; Russian FederationRussian Federation [075-15-2019-676]
Место публикации : Chin. Phys. B. - 2020. - Vol. 29, Is. 3. - Ст.037802. - ISSN 1674-1056, DOI 10.1088/1674-1056/ab6551. - ISSN 1741-4199(eISSN)
Примечания : Cited References: 38. - Project funded by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science (Grant 18-42-243023), the RF Ministry of Science and Higher Education, and the State Contract with Siberian Federal University for Scientific Research. A.E. thanks the grant of the President of Russian Federation (agreement 075-15-2019-676).
Предметные рубрики: SELECTIVE PHOTOMODIFICATION
LIGHT
FORCES
OPTICS
Аннотация: We have studied the dynamic and static processes occurring in disordered multiparticle colloidal Ag aggregates with natural structure and affecting their plasmonic absorption spectra under pico- and nanosecond pulsed laser radiations, as well as the physical origin responsible for these processes. We have shown that depending on the duration of the laser pulse, the mechanisms of laser modification of such aggregates can be associated both with changes in the resonant properties of the particles due to their heating and melting (picosecond irradiation mode) and with the particle shifts in the resonant domains of the aggregates (nanosecond pulses) which depend on the wavelength, intensity, and polarization of the radiation. These mechanisms result in formation of a narrow dip in the plasmonic absorption spectrum of the aggregates near the laser radiation wavelength and affect the shape and position of the dip. The effect of polydispersity of nanoparticle aggregates on laser photochromic reaction has been studied.
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20.

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 : arXiv: Cornell University, 2008. - Ст.0808.2355
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