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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Сазонов А. М., Кирик С. Д., Сильянов С. А., Баюков, Олег Артемьевич, Тишин П. А.
Заглавие : Типоморфизм арсенопирита золоторудных месторождений Благодатное и Олимпиада (Енисейский кряж)
Место публикации : Минералогия. - Миасс: Институт минералогии УрО РАН, 2016. - № 3. - С. 53-70
Примечания : Библиогр.: 24. - Работа выполнена при финансовой поддержке Министерства образования и науки РФ, программа «Организация проведения научных исследований», № 1025 и Фонда Михаила Прохорова (договор № АМ-94/15 и АМ-35/16).
Ключевые слова (''Своб.индексиров.''): месторождения золота олимпиада и благодатное--типоморфизм арсенопирита--кристаллическая структура--неоднородность состава--концентрации золота--температура--активность серы--olimpiada and blagodatnoye deposits--typomorphism of arsenopyrite--crystal structure--heterogeneity of composition--gold concentrations--temperature--sulphur activity
Аннотация: Присутствие арсенопирита является показателем золотоносности гидротермальной минерализации в месторождениях Олимпиада и Благодатное, где производится около 40 т золота ежегодно. Парагенетические ассоциации арсенопирита, морфология зёрен, кристаллическая структура и химический состав характеризуются значительной неоднородностью в пределах одного зерна, соседних зёрен, разновозрастных генераций, в различных участках рудных тел и в месторождениях. Кристаллизация минерала осуществлялась в интервале температур 300–542.5 °С при изменчивой активности серы в растворах (log αS2 ⋍ -5.7... -14.6) как в различных пробах, так и зёрнах, принадлежащих одной выборке. Повышенные концентрации золота и других благородных металлов отмечены в арсенопиритах с избытком серы и с избытком мышьяка.The presence of arsenopyrite is an indicator of gold in hydrothermal mineralization of the Olimpiada and Blagodatnoye deposits producing about 40t of gold annually. The paragenetic associations of arsenopyrite, the morphology of grains, the crystal structure and chemical composition are characterized by significant heterogeneity within a single grain, neighbouring grains, generations of different ages, in different parts of ore bodies and deposits. Mineral crystallization occurred in the temperature range of 300–542.5 °С, with variable sulphur activity in solutions (log αS2⋍ –5.7…–14.6). The increased concentrations of gold and other precious metals are noted in arsenopyrite with excess of sulphur and excess of arsenic with reduced structural and chemical stoichiometry.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Верпекин, Виктор Васильевич, Васильев, Александр Дмитриевич, Павленко, Нина Ивановна, Зимонин, Дмитрий Валерьевич, Бурмакина, Галина Вениаминовна
Заглавие : Реакции фенилацетиленидных комплексов золота (i) и фенилвинилиденов марганца и рения
Коллективы : Полифункциональные химические материалы и технологии, Томский государственный университет
Место публикации : Полифункциональные химические материалы и технологии: матер. междунар. науч. конф. : в 2-х т. - 2019. - Т. 1. - С. 172-173. - ISBN 978-5-6042143-9-8
Примечания : Исследование выполнено при финансовой поддержке Российского фонда фундаментальных исследований, Правительства Красноярского края, Красноярского краевого фонда науки в рамках научного проекта «Новые соединения на основе золота и благородных металлов: синтез, физико-химические свойства, каталитическая способность» (грант №18-43-240010)
Аннотация: A reactivity of gold phenylacetylides (L)Au-C=C-Ph (L = SMe2, C4H8S, C5H5N) towards the vinylidene complexes of rhenium and manganese containing a metallaallene system M=C=C are studied for the first time.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Дубынина А. В., Замай Т. Н., Коловская О. С., Кичкайло, Анна Сергеевна, Белянина И. В., Чанчикова Н. Г., Токарев Н. А., Карлова Е. А., Александровский, Александр Сергеевич, Шепелевич Н. В., Озерская А. В., Бадрин Е. А., Белугин К. В., Белкин С. А.
Заглавие : Адресная деструкция злокачественных опухолей биоконъюгатами на основе аптамеров
Коллективы : Красноярский государственный медицинский университет имени профессора В.Ф. Войно-Ясенецкого
Место публикации : Сиб. мед. обозрение. - Красноярск, 2016. - Т. 101, № 5. - С. 88-90. - ISSN 1819-9496
Примечания : Библиогр.: 2
Ключевые слова (''Своб.индексиров.''): аптамеры--золотые наночастицы--магнитные микродиски--гипертермия--плазмонный--резонанс--aptamers--gold nanoparticles--magnetic microdiscs--hyperthermia--plasmon resonance
Аннотация: Широкое распространение в терапии онкологических заболеваний в последние годы получили методы, основанные на применении различных типов наночастиц. Для повышения адресности Адресная деструкция злокачественных опухолей биоконъюгатами на основе аптамеров воздействия применяют различные молекулы, обладающие высокой специфичностью, одними из которых являются аптамеры. В работе исследовался эффект воздействия на опухоль конъюгатов наночастиц золота с аптамерами при воздействии лазера, а также оценивалась гибель клеток опухоли при использовании конъюгатов магнитных микродисков с аптамерами в условиях переменного магнитного поля. Исследование показало возможность применения исследуемых конъюгатов в качестве средств адресной деструкции опухоли.Widespread in cancer therapy in recent years have become the methods based on the use of different types of nanoparticles. To improve the targeting of the impact are used various molecules having high specificity, some of them are aptamers. The paper studied the effect of influence on the tumor the conjugates of gold nanoparticles with aptamers at laser exposure, as well as tumor cell death was assessed after using the conjugates of magnetic microdiscs with aptamers in a variable magnetic field. The study showed the possibility of using the studied conjugates as agents of targeted destruction of tumor.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sokolov A. Е., Ivanova O. S., Fedorov A. S., Kovaleva E. A., Vysotin M. A., Lin, C-R, Ovchinnikov S. G.
Заглавие : Why the magnetite-gold core-shell nanoparticles are not quite good and how to improve them
Коллективы : Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [19-52-52002]; Ministry of Science and Technology of TaiwanMinistry of Science and Technology, Taiwan [109-2112-M-153-003, 108-2923-M-153-001-MY3]
Место публикации : Phys. Solid State. - 2021. - Vol. 63, Is. 10. - P.1536-1540. - ISSN 1063-7834, DOI 10.1134/S1063783421090365. - ISSN 1090-6460(eISSN)
Примечания : Cited References: 35. - This study was supported by the Russian Foundation for Basic Research, project no. 19-52-52002, and the Ministry of Science and Technology of Taiwan, projects MOST nos. 109-2112-M-153-003 and 108-2923-M-153-001-MY3
Предметные рубрики: IRON-OXIDE NANOPARTICLES
TOTAL-ENERGY CALCULATIONS
STABILITY
DESIGN
Аннотация: The nature of the formation of a chemical bond at the magnetite-gold interface has been studied. The geometric structure and the electronic and magnetic properties of plane layers consisting of magnetite Fe3O4 and gold have been investigated using the DFT-GGA calculation. It has been found that the specific energy and the wetting parameter of the magnetite-gold interface are negative, which leads to the island growth of small Au particles on the Fe3O4 surface. The role of an intermediate thin titanium layer between magnetite and gold has been discussed. The specific energy and wetting parameter of the magnetite-titanium (for thin Ti layers) and magnetite-titanium-gold interfaces are positive. It has been suggested that an intermediate thin titanium layer at the interface between the magnetite nanoparticle surface and the gold layer will make it possible to obtain magnetite nanoparticles with a continuous gold coating.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zabluda V. N., Sokolov A. E., Ovchinnikov S. G., Knyazev B. A., Michlin J. L., Veshnyakova E.A., Zubavichus Y. V., Kalsin A. M., Gerasimov V. V.
Заглавие : Vizible and terahertz magnetooptics in gold and silver low-dimensional objects : Abstract
Коллективы : "Functional Materials", International Conference , Taurida National V. I. Vernadsky University
Место публикации : Functional materials: Abstracts/ ed. V. N. Berzhansky. - Simferopol, 2013. - P.223. - ISBN 978-966-491-465-6
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Zabluda V.N, Sokolov A.E, Ovchinnikov S.G., Zubavichus Ya.V, Kalsin A.M.
Заглавие : Visible magnetic circular dichroism in gold nanoparticles
Коллективы : International Conference Functional Materials
Место публикации : International Conference Functional Materials (ICFM-2011): Book of abstracts : [3-8 Oct. 2011, Crimea, Ukraine]. - 2011. - С. 187
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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) : 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 журнала
Шифр издания :
Автор(ы) : Sorensen, Lasse K., Khrennikov, Daniil E., Gerasimov, Valeriy S., Ershov, Alexander E., Vysotin M. A., Monti, Susanna, Zakomirnyi, Vadim, I, Polyutov, Sergey P., Agren, Hans, Karpov S. V.
Заглавие : Thermal degradation of optical resonances in plasmonic nanoparticles
Коллективы : Russian Science FoundationRussian Science Foundation (RSF) [18-13-00363]; Carl Tryggers Stifetelse [CTS 18-441]; Swedish Research CouncilSwedish Research CouncilEuropean Commission [SNIC 2020/3-29]
Место публикации : Nanoscale. - 2022. - Vol. 14, Is. 2. - P.433-447. - ISSN 2040-3364, DOI 10.1039/d1nr06444d. - ISSN 2040-3372(eISSN)
Примечания : Cited References: 85. - The work is supported by the Russian Science Foundation (project No. 18-13-00363). L. K. S. acknowledges the support of Carl Tryggers Stifetelse, project CTS 18-441. The authors thank the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center "Krasnoyarsk Science Center SB RAS" for the use of Hitachi S-5500 high-resolution scanning electron microscope for the analysis of nanomaterials. Some of the computations were enabled by resources provided by the Swedish National Infrastructure for Computing (SNIC) at the High Performance Computing Center North (HPC2N) partially funded by the Swedish Research Council through grant agree-ment no. SNIC 2020/3-29. Authors thank Anton Utyushev for technical assistance in preparation of Fig. 3
Предметные рубрики: STABILIZED GOLD NANOPARTICLES
DIPOLE INTERACTION-MODEL
Аннотация: The dependence of plasmon resonance excitations in ultrafine (3-7 nm) gold nanoparticles on heating and melting is investigated. An integrated approach is adopted, where molecular dynamics simulations of the spatial and temporal development of the atoms constituting the nanoparticles generate trajectories out of which system conformations are sampled and extracted for calculations of plasmonic excitation cross sections which then are averaged over the sample configurations for the final result. The calculations of the plasmonic excitations, which take into account the temperature- and size-dependent relaxation of the plasmons, are carried out with a newly developed Extended Discrete Interaction Model (Ex-DIM) and complemented by multilayered Mie theory. The integrated approach clearly demonstrates the conditions for suppression of the plasmons starting at temperatures well below the melting point. We have found a strong inhomogeneous dependence of the atom mobility in the particle crystal lattice increasing from the center to its surface upon the temperature growth. The plasmon resonance suppression is associated with an increase of the mobility and in the amplitude of phonon vibrations of the lattice atoms accompanied by electron-phonon scattering. This leads to an increase in the relaxation constant impeding the plasmon excitation as the major source of the suppression, while the direct contribution from the increase in the lattice constant and its chaotization at melting is found to be minor. Experimental verification of the suppression of surface plasmon resonance is demonstrated for gold nanoparticles on a quartz substrate heated up to the melting temperature and above.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Tarasov I. A., Smolyarova T. E., Nemtsev I. V., Yakovlev I. A., Volochaev M. N., Solovyov L. A., Varnakov S. N., Ovchinnikov S. G.
Заглавие : Tailoring the preferable orientation relationship and shape of α-FeSi2nanocrystals on Si(001): The impact of gold and the Si/Fe flux ratio, and the origin of α/Si boundaries
Место публикации : CrystEngComm. - 2020. - Vol. 22, Is. 23. - P.3943-3955. - ISSN 14668033 (ISSN), DOI 10.1039/d0ce00399a
Примечания : Cited References: 52. - The experimental part of the reported study was funded by the Russian Science Foundation, project no. 16-13-00060-Π. Theoretical analysis of the ORs of the α-FeSi2 nanocrystals grown was supported by the Russian Foundation for Basic Research, Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science via research project No. 18-42-243013. We also acknowledge the Krasnoyarsk Regional Center of Research Equipment of Federal Research Center “Krasnoyarsk Science Center SB RAS” for support with carrying out the microscopic investigations. I. A. Tarasov personally thanks M. A. Visotin for continuous fruitful discussion about the energetics of the formation of the α-FeSi2 nanocrystals
Аннотация: The growth of α-FeSi2 nanocrystal ensembles on gold-activated and gold-free Si(001) surfaces at different Si/Fe flux ratios via molecular beam epitaxy is reported. The study reveals that the utilisation of gold as a catalyst regulates the preferable orientation relationship (OR) of the nanocrystals to silicon and their morphology at a given Si/Fe flux ratio. α-FeSi2 free-standing crystals with continuously tuned sizes from 30 nm up to several micrometres can be grown with an α(001)//Si(001) basic OR under gold-assisted conditions and an α(111)//Si(001) OR under gold-free growth conditions on a Si(001) surface. The preferred morphology of nanocrystals with a particular OR can be altered through changes to the Si/Fe flux ratio. Herein, the microstructure and basic OR between the silicide nanocrystals and the silicon substrate, and the formation of nanocrystal facets were analysed in detail with the help of microscopic techniques and simulation methods based on the analysis of near coincidence site (NCS) distributions at silicide/silicon interfaces. On the basis of the simulations used, we managed to reveal the nature of the interfaces observed for the main types of α-FeSi2 nanocrystals grown. Three types of interfaces typical for nanoplates with an α(001)//Si(001) basic OR, which are (i) stepped, (ii) stressed, and (iii) flat, are explained based on the tendency for the NCS density to increase at the interface. The results presented reveal the potential for the bottom-up fabrication of α-FeSi2 nanocrystals with tuned physical properties as potentially important contact materials and as building blocks for future nanoelectronic devices.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Krinitsyn D. O., Romanchenko A. S., Vorob'ev S. A., Likhatskii M. N., Karacharov A. A., Krylov A. S., Volochaev M. N., Mikhlin, Yu L.
Заглавие : Synthesizing zinc sulfide films on the gold surface as the sensor for electrochemical quartz crystal microbalance
Коллективы : Russian Scientific FoundationRussian Science Foundation (RSF) [18-17-00135]
Место публикации : Russ. J. Electrochem. - 2021. - Vol. 57, Is. 12. - P.1157-1163. - ISSN 1023-1935, DOI 10.1134/S1023193521120041. - ISSN 1608-3342(eISSN)
Примечания : Cited References: 23. - The study was supported by the Russian Scientific Foundation (grant no. 18-17-00135)
Предметные рубрики: CHEMICAL BATH DEPOSITION
ZNS
SPHALERITE
ELECTRODES
ACTIVATION
Аннотация: A zinc sulfate film is deposited from aqueous solutions of zinc sulfate onto the gold surface with the aim of preparation of a sensor for electrochemical quartz crystal microbalance (EQCM). The kinetics of this process, the particles formed in solution, and the film itself are studied by the methods of electrochemical quartz crystal microbalance, X-ray photoelectron spectroscopy, transmission electron microscopy, atomic force microscopy, optical and Raman spectroscopies, and dynamic light scattering. The effect of the procedure of gold surface preparation, the reagent concentration, and the temperature on the film adhesion, the length of induction period, the kinetics of film growth, and its structure and thickness are studied. It is shown that the film formation proceeds as a result of deposition of sufficiently coarse 200-700 nm colloid particles of sphalerite. It is demonstrated that this sensor can be used in studying the electrochemical reactions of ZnS and the interface phenomena by the methods of EQCM and cyclic voltammetry.
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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Saykova, Diana, Saikova, Svetlana, Mikhlin, Yuri, Panteleeva, Marina, Ivantsov R. D., Belova E.
Заглавие : Synthesis and characterization of core-shell magnetic nanoparticles NiFe2O4@Au
Место публикации : Metals. - 2020. - Vol. 10, Is. 8. - Ст.1075. - ISSN 2075-4701(eISSN), DOI 10.3390/met10081075
Примечания : Cited References: 45
Предметные рубрики: NICKEL FERRITE NANOPARTICLES
GOLD NANOPARTICLES
OXIDATION
REDUCTION
Аннотация: In this study, NiFe2O4@Au core–shell nanoparticles were prepared by the direct reduction of gold on the magnetic surface using amino acid methionine as a reducer and a stabilizing agent simultaneously. The obtained nanoparticles after three steps of gold deposition had an average size of about 120 nm. The analysis of particles was performed by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and UV-Vis spectroscopy techniques. The results indicate successful synthesis of core–shell particles with the magnetic core, which consists of a few agglomerated nickel ferrite crystals with an average size 25.2 ± 2.0 nm, and the thick gold shell consists of fused Au0 nanoparticles (NPs). Magnetic properties of the obtained nanoparticles were examined with magnetic circular dichroism. It was shown that the magnetic behavior of NiFe2O4@Au NPs is typical for superparamagnetic NPs and corresponds to that for NiFe2O4 NPs without a gold shell. The results indicate the successful synthesis of core–shell particles with the magnetic nickel ferrite core and thick gold shell, and open the potential for the application of the investigated hybrid nanoparticles in hyperthermia, targeted drug delivery, magnetic resonance imaging, or cell separation. The developed synthesis strategy can be extended to other metal ferrites and iron oxides.
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13.

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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14.

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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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Moiseenko E. T., Altunin R. R., Zharkov S. M.
Заглавие : Solid-state synthesis and atomic ordering in thin Cu/Au films (Atomic Ratio, Cu : Au = 3 : 1)
Место публикации : Bull. Russ. Acad. Sci.: Phys.: Allerton Press, 2012. - Vol. 76, Is. 10. - P.1149-1151. - ISSN 1062-8738, DOI 10.3103/S1062873812100073
Ключевые слова (''Своб.индексиров.''): atomic ordering--atomic ratio--bi-layer--in-situ transmission--nano films--solid-state synthesis--space groups--atoms--gold--in situ processing--transmission electron microscopy--copper
Аннотация: In situ transmission electron microscopy investigations of the processes of solid-state synthesis and atomic ordering in bilayer Cu/Au nanofilms (atomic ratio, Cu : Au = 3 : 1) are conducted. It is found that solid-state synthesis starts at 170В°C. A Cu 3Au atomic-disordered structure (Fm3m space group; lattice con- stant, a = 3.76 В± 0.01 A) forms at 280В°C. Annealing the film for 1 hour at 380В°C produced a Cu 3AuI (L1 2 type) atomic-ordered superstructure, a Pm-3m space group, and lattice constant, a = 3.76 В± 0.01 a in the bulk of the film.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belousov O. V., Borisov R. V., Zharkov S. M., Parfenov V. A., Dorokhova L. I.
Заглавие : Redox potentials of gold-palladium powders in aqueous solutions of H2PdCl4
Место публикации : Russ. J. Phys. Chem. A: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 86, Is. 3. - P.484-488. - ISSN 0036-0244, DOI 10.1134/S0036024412020070
Примечания : Cited References: 26
Предметные рубрики: BIMETALLIC NANOPARTICLES
METALLIC PALLADIUM
COPPER
ELECTRODE
BLACK
Bimetallic particles
Bimetallic powders
Gold-palladium
Hydrochloric acid solution
Nernst equation
Redox potentials
Gold
Hydrochloric acid
Redox reactions
Secondary batteries
Transmission electron microscopy
X ray diffraction analysis
Ключевые слова (''Своб.индексиров.''): bimetallic powders--gold-palladium--redox potential
Аннотация: The redox potential of fine-dispersed and compact bimetallic powders of the palladium-gold system in hydrochloric acid solutions of H2PdCl4 at a temperature of 60A degrees C was studied. It was found that the redox potential increases with gold enrichment of the solid solution in accordance with the Nernst equation. The effect of gold-palladium particle size on this redox potential is shown. The morphology, sizes, and composition of bimetallic particles are determined via transmission electron microscopy and X-ray diffraction analysis.
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17.

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. - NEW YORK: SPRINGER, 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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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sukhinin Y. V.
Заглавие : Phase transitions in self-assembled monolayers of alkanethiols containing the polar group
Место публикации : J. Exp. Theor. Phys.: AMER INST PHYSICS, 1998. - Vol. 87, Is. 1. - P115-122. - ISSN 1063-7761, DOI 10.1134/1.558645
Примечания : Cited References: 38
Предметные рубрики: ORGANIZED MOLECULAR ASSEMBLIES
ALKYL THIOL MONOLAYERS
STRUCTURAL CHARACTERIZATION
DYNAMICS SIMULATION
LANGMUIR MONOLAYER
SURFACES
GOLD
FILMS
AU(111)
MODEL
Аннотация: Equilibrium states of the system of self-assembled monolayers (SAMs) of n-alkanethiol molecules HS(CH2)(n-1)(X) with polar group X chemiabsorbed on the Au(111) crystal surface are considered. The couplings between the atoms (C, H) of the n-alkanethiols are approximated by the Lennard-Jones potential. The couplings between the n-alkanethiols and the crystal surface are approximated by the 12-3 potential. The interactions of polar groups and the self-images with the metal substrate are taken into consideration. The phase-transition temperatures, the structural order and equilibrium tilt, and the twist and azimuthal angles of the macromolecules, which depend on the dipole moments, are found. (C) 1998 American Institute of Physics.
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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sadreev A. F., Sukhinin Y. V.
Заглавие : Phase transitions in a system of CH3(CH2)(n-1) self-assembled on the Au(111) crystal surface
Место публикации : Phys. Rev. B: AMERICAN PHYSICAL SOC, 1996. - Vol. 54, Is. 24. - P17966-17973. - ISSN 1098-0121, DOI 10.1103/PhysRevB.54.17966
Примечания : Cited References: 44
Предметные рубрики: ORGANIZED MOLECULAR ASSEMBLIES
ALKYL THIOL MONOLAYERS
STRUCTURAL CHARACTERIZATION
DYNAMICS SIMULATION
DEVILS STAIRCASE
GOLD SURFACES
FILMS
MODEL
CHAIN
DIFFRACTION
Аннотация: The n-alkanethiols CH3(CH2)(n-1) on the crystal surface of gold (111) are considered. Couplings between atoms (C, H) of the n-alkanethiols were modelled by the Morse potential, and couplings between the n-alkanethiols and the crystal surface were modelled by 12-3 potentials. Because of symmetry Z(2) of the n-alkanethiols in a tilted state, the system can be reduced to the Ising model on the triangular lattice, the phase diagram of which can be explicitly considered. Depending on the choice of the coupling parameters, the ordered state of the system may form an incommensurate or 2X1 superstructure. The temperatures of the phase transition, equilibrium tilting, twisting, and azimuthal angles are found to depend on the Morse coupling constants.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Kostyukov A. S., Isaev I. L., Ershov A. E., Gerasimov V. S., Polyutov S. P., Karpov S. V.
Заглавие : Part I. Nanobubbles in pulsed laser fields for anticancer therapy: in search of adequate models and simulation approaches
Коллективы : Ministry of Science and High Education of Russian Federation [FSRZ-2020-0008]; RFBRRussian Foundation for Basic Research (RFBR); Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science [20-42-240003]
Место публикации : J. Phys. D. - 2022. - Vol. 55, Is. 17. - Ст.175401. - ISSN 0022-3727, DOI 10.1088/1361-6463/ac4c20. - ISSN 1361-6463(eISSN)
Примечания : Cited References: 99. - The research was supported by the Ministry of Science and High Education of Russian Federation (Project No. FSRZ-2020-0008), and was funded by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, Project Number 20-42-240003
Предметные рубрики: INDUCED CELL-LYSIS
GOLD NANOPARTICLES
SELECTIVE NANOPHOTOTHERMOLYSIS
Аннотация: We numerically investigate the conditions for the laser-induced formation of nanobubbles in aqueous medium around plasmonic nanoparticles (NPs) bound to the malignant cell membranes that is considered as the method of their irreversible damage. We proposed employing the versatile and accessible simulation software as a research tool based on the finite volume method underlying the ANSYS Fluent package and supplemented with our user-defined functions that adapt it to solution of the stated problems. This adaptation allows to verify the model using experimental data for the same conditions. We determined the conditions for the pressure growth on the cell membrane at the initial moment of bubble formation significantly exceeding the threshold of irreversible damage. The model can be used for investigation of hydrodynamic effects accompanying irradiation of plasmonic NPs using both different types of pulsed lasers and ideally absorbing NPs with resonance in the hemoglobin spectral transparency range, as well as to uncover previously unknown effects. They include the conditions for localization of a damaging factor non-affecting the normal cells, the conditions for generation of ultrahigh pressure pulse that enables to damage the cell membrane and precedes formation of thin vapor shell around NPs, which, unlike large bubbles, requires registration using highly sensitive experimental measurements. An extensive overview of key publications summarizing the state-of-art in this area is presented.
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