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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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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) : Sokolov A. E., Zabluda V. N., Ovchinnikov S. G., Knyazev B. A., Gerasimov V. V., Michlin J. L., Veshnyakova E.A., Zubavichus Y. V., Kalsin A. M.
Заглавие : Magnetooptics in gold and silver nanosizes low-dimensional objects
Коллективы : "Nanomaterials: Application and Properties", International Conference (3; 16–21 Sept., 2013; Alushta, Ukraine)
Место публикации : Proc. Int. Conf. Nanomaterials: Application and Properties. - 2013. - Vol. 2, № 1. - Ст.01NFPMM06
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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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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ershov A. E., Gavrilyuk A. P., Karpov S. V., Semina P. N.
Заглавие : Optodynamic phenomena in aggregates of polydisperse plasmonic nanoparticles
Коллективы : Russian Academy of Sciences [24.29, 24.31, III.9.5, 43, SB RAS-SFU (101)]; Ministry of Education and Science of Russian Federation [14.B37.21.0457]
Место публикации : Appl. Phys. B: Springer, 2014. - Vol. 115, Is. 4. - P.547-560. - ISSN 0946-2171, DOI 10.1007/s00340-013-5636-6. - ISSN 1432-0649
Примечания : Cited References: 48. - Authors are thankful to Prof. V. A. Markel (University of Pennsylvania) for supplying program codes for realization of the coupled dipole method for polydisperse metal nanoparticle aggregates. This research was supported by the Russian Academy of Sciences under the Grants 24.29, 24.31, III.9.5, 43, SB RAS-SFU (101); Ministry of Education and Science of Russian Federation under Contract 14.B37.21.0457.
Предметные рубрики: SMALL-PARTICLE COMPOSITES
OPTICAL-PROPERTIES
NOBLE-METALS
SILVER
ELECTRON
LIQUID
GENERATION
DYNAMICS
FORCES
GOLD
Аннотация: We propose an optodynamical model of interaction of pulsed laser radiation with aggregates of spherical metallic nanoparticles embedded into host media. The model takes into account polydispersity of particles, pair interactions between the particles, dissipation of absorbed energy, heating and melting of the metallic core of particles and of their polymer adsorption layers, and heat exchange between electron and ion components of the particle material as well as heat exchange with the interparticle medium. Temperature dependence of the electron relaxation constant of the particle material and the effect of this dependence on interaction of nanoparticles with laser radiation are first taken into consideration. We study in detail light-induced processes in the simplest resonant domains of multiparticle aggregates consisting of two particles of an arbitrary size in aqueous medium. Optical interparticle forces are realized due to the light-induced dipole interaction. The dipole moment of each particle is calculated by the coupled dipole method (with correction for the effect of higher multipoles). We determined the role of various interrelated factors leading to photomodification of resonant domains and found an essential difference in the photomodification mechanisms between polydisperse and monodisperse nanostructures.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Myagkov V. G., Bayukov O. A., Mikhlin Y. L., Zhigalov V. S., Bykova L. E., Bondarenko G. N.
Заглавие : Long-range chemical interactions in solid-state reactions: effect of an inert Ag interlayer on the formation of L10-FePd in epitaxial Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1) trilayers
Место публикации : Philos. Mag.: Taylor & Francis, 2014. - Vol. 94, Is. 23. - P.2595-2622. - ISSN 1478-6435, DOI 10.1080/14786435.2014.926037. - ISSN 1478-6443
Примечания : Cited References: 117
Предметные рубрики: HIGH-TEMPERATURE SYNTHESIS
THIN-FILMS
PHASE-FORMATION
MAGNETIC-PROPERTIES
X-RAY
MARTENSITIC TRANSFORMATIONS
PHOTOELECTRON-SPECTROSCOPY
STRUCTURAL CHARACTERISTICS
CASIMIR FORCE
GOLD-FILMS
Ключевые слова (''Своб.индексиров.''): fe-pd system--epitaxial thin film--inert ag buffer layer--diffusion--solid-state reactions--l1(0)--long-range chemical interactions
Аннотация: The effect of 0, 0.5, and 1 μm-thick Ag interlayers on the chemical interaction between Pd and Fe in epitaxial Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1)/MgO(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1)/MgO(0 0 1) trilayers has been studied using X-ray diffraction, 57Fe Mössbauer spectroscopy, X-ray photoelectron spectroscopy, and magnetic structural measurements. No mixing of Pd and Fe occurs via the chemically inert Ag layer at annealing temperatures up to 400 °C. As the annealing temperature is increased above 400 °C, a solid-state synthesis of an ordered L10-FePd phase begins in the Pd(0 0 1)/Ag(0 0 1)/Fe(0 0 1) and Fe(0 0 1)/Ag(0 0 1)/Pd(0 0 1) film trilayers regardless of the thickness of the buffer Ag layer. In all samples, annealing above 500 °C leads to the formation of a disordered FexPd1−x(0 0 1) phase; however, in samples lacking the Ag layer, the synthesis of FexPd1−x is preceded by the formation of an ordered L12-FePd3 phase. An analysis of the X-ray photoelectron spectroscopy results shows that Pd is the dominant moving species in the reaction between Pd and Fe. According to the preliminary results, the 2.2 μm-thick Ag film does not prevent the synthesis of the L10-FePd phase and only slightly increases the phase’s initiation temperature. Data showing the ultra-fast transport of Pd atoms via thick inert Ag layers are interpreted as direct evidence of the long-range character of the chemical interaction between Pd and Fe. Thus, in the reaction state, Pd and Fe interact chemically even though the distance between them is about 104 times greater than an ordinary chemical bond length.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ershov A. E., Gavrilyuk A. P., Karpov S. V., Semina P. N.
Заглавие : Effect of local environment in resonant domains of polydisperse plasmonic nanoparticle aggregates on optodynamic processes in pulsed laser fields
Коллективы : Russian Academy of Sciences [24.29, 24.31, III.9.5, 43, SB RAS-SFU (101), 3-9-5]
Место публикации : Chin. Phys. B: IOP Publishing, 2015. - Vol. 24, Is. 4. - Ст.047804. - ISSN 1674, DOI 10.1088/1674-1056/24/4/047804. - ISSN 17414199(eISSN)
Примечания : Cited References:25. - Project supported by the Russian Academy of Sciences (Grant Nos. 24.29, 24.31, III.9.5, 43, SB RAS-SFU (101), and 3-9-5).
Предметные рубрики: METAL NANOPARTICLES
GOLD NANOPARTICLES
OPTICAL-PROPERTIES
Ключевые слова (''Своб.индексиров.''): nanoparticle--surface plasmon--colloid aggregate--optodynamics
Аннотация: Interactions of pulsed laser radiation with resonance domains of multiparticle colloidal aggregates having an increasingly complex local environment are studied via an optodynamic model. The model is applied to the simplest configurations, such as single particles, dimers, and trimers consisting of mono- and polydisperse Ag nanoparticles. We analyze how the local environment and the associated local field enhancement by surrounding particles affect the optodynamic processes in domains, including their photomodification and optical properties.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Dubynina A. V., Semina P. N., Sokolov A. E., Zabluda V. N., Aleksandrovskii A. S., Karacharov A., Zamay G. S., Kolovskaya O. S., Ivanchenko T., Govorina Y., Zamay A. S., Zamay T. S.
Заглавие : Aptamer-mediated targeted hyperthermia caused by gold nanoparticles
Коллективы : Annual Meeting of the Oligonucleotide Therapeutics Society
Место публикации : 11th Annual Meet. of the Oligonucleotide Therapeutics Soc. (OTS). - 2015. - P.127
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sadreev A. F., Sukhunin Y. V., Petoral R. M., Uvdal K.
Заглавие : Ground state and phase transitions in a system of arg-cysteamines self-assembled on a Au(111) crystal surface
Место публикации : J. Chem. Phys.: AMER INST PHYSICS, 2004. - Vol. 120, Is. 2. - P954-960. - ISSN 0021-9606, DOI 10.1063/1.1631920
Примечания : Cited References: 38
Предметные рубрики: MOLECULAR-DYNAMICS SIMULATION
HYDROGEN-BOND
MONOLAYERS
MODEL
GOLD
PEPTIDES
ALKANETHIOLS
ACTIVATION
FILMS
CYS
Ключевые слова (''Своб.индексиров.''): gold--ground state--hydrogen bonds--molecules--phase transitions--self assembly--surfaces--temperature--arg-cysteamines--crystal surface--dipole moments--dipole-dipole interactions--molecular dynamics
Аннотация: The translational and orientation order of arg-cysteamine molecules chemiabsorbed on the Au(111) crystal surface is considered. Couplings between carbon, nitrogen, and hydrogen atoms of the n-alkanethiols are approximated by the Lennard-Jones potential. Moreover, hydrogen bonds between oxygen and nitrogen and dipole-dipole interactions of the dipole moments of different atomic groups are taken into account. It is found that molecules are arranged in a 2x2 lattice and have the total symmetry C(6)xZ(2). The critical temperature of the phase transition to the tilted state T-c1, which breaks the symmetry C-6, is estimated to be extremely high. The spontaneous breakdown of the remaining symmetry Z(2) leads to the twisted state of the molecules and has the critical temperature T-c2=340 K. (C) 2004 American Institute of Physics.
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10.

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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11.

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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12.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Gerasimov V. S., Ershov A. E., Karpov S. V., Polyutov S. P., Semina P. N.
Заглавие : Optimization of photothermal methods for laser hyperthermia of malignant cells using bioconjugates of gold nanoparticles
Место публикации : Colloid J.: MAIK Nauka-Interperiodica / Springer, 2016. - Vol. 78, Is. 4. - P.435-442. - ISSN 1061933X (ISSN), DOI 10.1134/S1061933X16040050
Примечания : Cited References: 33. - This work was supported by the Ministry of Education and Science of the Russian Federation (contract no. 14.607.21.0104 RFMEFI60714X0104) (Section 3) and the State Assignment of the Ministry of Education and Science of the Russian Federation for Siberian Federal University (contract no. 1792) (Section 2). The numerical calculations were performed using the MVS-1000 M cluster at the Institute of Computational Modeling, Siberian Branch, Russian Academy of Sciences.
Предметные рубрики: THERMAL THERAPY
PLASMONIC NANOPARTICLES
OPTICAL-PROPERTIES
TUMOR-CELLS
CARCINOMA
CLUSTERS
CANCER
Аннотация: Selective action of laser radiation on membranes of malignant cells has been studied in different regimes using conjugates of gold nanoparticles with oligonucleotides by the example of DNA aptamers. Under the conditions of a contact between a bioconjugate and a cell surface and the development of substantial and rapidly relaxing temperature gradients near a nanoparticle, the membranes of malignant cells alone are efficiently damaged due to the local hyperthermia of a cellular membrane. It has been shown that employment of pulsed instead of continuous wave laser radiation provides the localization of the damaging action, which does not involve healthy cells. © 2016, Pleiades Publishing, Ltd.
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13.

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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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 сборника (однотомник)
Шифр издания :
Автор(ы) : Zakomirnyi V. I., Rasskazov I. L., Gerasimov R.E., Ershov A. E., Karpov S. V., Polyutov S. P.
Заглавие : Multilayered gold nanoshells with ideal absorption for plasmonic photothermal therapy
Коллективы : International Conference on Coherent and Nonlinear Optics, International Conference on Lasers, Applications, and Technologies
Место публикации : The International Conference on Coherent and Nonlinear Optics; The Lasers, Applications, and Technologies ICONO/LAT 2016. - 2016. - Ст.IThL8. - P.68-69
Аннотация: In this paper we study multilayered spherical nanoparticles with ideal absorption for biomedical applications. The core of such particles consists of Si, SiO2 or alternative plasmonic materials, such as zinc oxide doped with aluminum, gallium and indium tin oxide whereas the outer shell consists of gold. We develop the algorithm for finding optimal geometry of ideally absorbing Au nanoparticles taking into account the quantum size effect that in multilayered metallic nanoshells plays a significant role.
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16.

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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17.

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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18.

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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19.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Zakomirnyi V .I., Rasskazov I. L., Gerasimov V. S., Ershov A. E., Karpov S. V., Polyutov S. P.
Заглавие : Multilayered gold nanoshells with ideal absorption for plasmonic photothermal therapy
Коллективы : International Conference on Coherent and Nonlinear Optics, International Conference on Lasers, Applications, and Technologies
Место публикации : Журнал прикладной спектроскопии. - Минск, 2016. - Т. 83, Вып. 6-16. - P.177-178. - ISSN 0514-7506
Аннотация: We study multilayered spherical nanoparticles with ideal absorption [1] for biomedical applications. The core of such particles consists of Si, SiO2 or alternative plasmonic materials [2], such as zinc oxide doped with aluminum, gallium and indium tin oxide whereas the outer shell consists of gold. We develop the algorithm for finding optimal geometry of ideally absorbing Au nanoparticles taking into account the quantum size effect that in multilayered metallic nanoshells plays a significant role.
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Belyanina I. V., Zamay T. N., Zamay G. S., Zamay S. S., Kolovskaya, Olga S., Ivanchenko, Tatiana I., Denisenko, Valery V., Kirichenko, Andrey K., Glazyrin, Yury E., Garanzha, Irina V., Grigorieva, Valentina V., Shabanov A. V., Veprintsev, Dmitry V., Sokolov A. E., Sadovskii, Vladimir M., Gargaun, Ana, Berezovski M. V., Kichkailo, Anna S.
Заглавие : In vivo cancer cells elimination guided by aptamer-functionalized gold-coated magnetic nanoparticles and controlled with low frequency alternating magnetic field
Коллективы : Russian Scientific Fund [14-15-00805]
Место публикации : Theranostics. - 2017. - Vol. 7, Is. 13. - P.3326-3337. - ISSN 1838-7640, DOI 10.7150/thno.17089
Примечания : Cited References:35. - The authors are grateful to George Y. Vorogeikin, Yuri I. Vorogeikin and "OKB ART". Andrey Barinov and "OPTEC Group" for help with 3D laser scanning imaging. Microscopic analyses using Carl Zeiss LSM 800 were done in the "Center for bioassay, nanotechnology and nanomaterials safety" ("Biotest-Nano") (Multiple-Access Center, Tomsk State University, Tomsk, Russia). Toxicity studies have been performed in Multiple-Access Center, Central Scientific Research Laboratory in Krasnoyarsk State Medical University named after prof. V.F. Voino-Yasenecky. This work was supported by the Russian Scientific Fund (grant #14-15-00805).
Предметные рубрики: PHOTOTHERMAL THERAPY
INTEGRIN ACTIVATION
FIBRONECTIN
STIMULATION
Ключевые слова (''Своб.индексиров.''): cancer therapy--gold coated magnetic nanoparticles--dna aptamers--low--frequency alternating magnetic field--fibronectin--integrin--apoptosis--necrosis
Аннотация: Biomedical applications of magnetic nanoparticles under the influence of a magnetic field have been proved useful beyond expectations in cancer therapy. Magnetic nanoparticles are effective heat mediators, drug nanocarriers, and contrast agents; various strategies have been suggested to selectively target tumor cancer cells. Our study presents magnetodynamic nanotherapy using DNA aptamer-functionalized 50 nm gold-coated magnetic nanoparticles exposed to a low frequency alternating magnetic field for selective elimination of tumor cells in vivo. The cell specific DNA aptamer AS-14 binds to the fibronectin protein in Ehrlich carcinoma hence helps deliver the gold-coated magnetic nanoparticles to the mouse tumor. Applying an alternating magnetic field of 50 Hz at the tumor site causes the nanoparticles to oscillate and pull the fibronectin proteins and integrins to the surface of the cell membrane. This results in apoptosis followed by necrosis of tumor cells without heating the tumor, adjacent healthy cells and tissues. The aptamer-guided nanoparticles and the low frequency alternating magnetic field demonstrates a unique non-invasive nanoscalpel technology for precise cancer surgery at the single cell level.
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