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Numerical studies of second- and fourth-order correlation functions in cluster-cluster aggregates in application to optical scattering / V. A. Markel [et al.] // Phys. Rev. E. - 1997. - Vol. 55, Is. 6. - P. 7313-7333, DOI 10.1103/PhysRevE.55.7313. - Cited References: 21 . - ISSN 1063-651X

РУБ Physics, Fluids & Plasmas + Physics, Mathematical
Рубрики:
DIFFUSION-LIMITED AGGREGATION
   COLLOIDAL AGGREGATION
   FRACTAL CLUSTERS
   ANTICORRELATION
   SIMULATIONS
Аннотация: Two- and four-point density correlation functions p(2)(r) and p(4)(r) are studied numerically and theoretically in computer-generated three-dimensional lattice cluster-cluster aggregates (CCA) with the number of particles N up to 20 000 in application to the light scattering problem. The ''pure'' aggregation algorithm is used, where subclusters of all possible sizes are allowed to collide. We find that large CCA clusters demonstrate pronounced multiscaling. In particular, the fractal dimension determined from the slope of p(2)(r) at small distances differs from that found from the dependence of the radius of gyration on the number of monomers (according to our data, 1.80 and 1.94, respectively). We also consider different functional forms for p(2) and their general properties and applicability. We find that the best fit to the numerical data is provided by the generalized exponential cutoff function with coefficients depending on N. The latter dependence is a manifestation of multiscaling. We propose some theoretical approaches for calculating p(4)(r), assuming p(2)(r) is known. In particular, we find the small-r asymptote for the p(4)(r) and verify it numerically. In addition, we find that p(4)(r) cannot be represented by a scaling dependence with a cutoff function, like p(2)(r) Instead, p(4)(r) is given by an expansion in terms of integer powers of r(2D-3), where D is the fractal dimension (approximate to 1.8 for CCA clusters).

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Держатели документа:
UNIV WISCONSIN,DEPT CHEM,OFF CHANCELLOR,STEVENS POINT,WI 54481
UNIV WISCONSIN,DEPT PHYS & ASTRON,STEVENS POINT,WI 54481
RUSSIAN ACAD SCI,INST AUTOMAT & ELECTROMETRY,NOVOSIBIRSK 630090,RUSSIA
RUSSIAN ACAD SCI,SIBERIAN BRANCH,LV KIRENSKY PHYS INST,KRASNOYARSK 660036,RUSSIA
ИФ СО РАН

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Markel, V. A.; Shalaev, V. M.; Poliakov, E. Y.; George, T. F.
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Electromagnetic density of states and absorption of radiation by aggregates of nanospheres with multipole interactions / V. A. Markel [et al.] // Phys. Rev. B. - 2004. - Vol. 70, Is. 5. - Ст. 54202, DOI 10.1103/PhysRevB.70.054202. - Cited References: 81 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
DISCRETE-DIPOLE APPROXIMATION
   ENHANCED RAMAN-SCATTERING
   METAL FRACTAL CLUSTERS
   OPTICAL-PROPERTIES
   SELECTIVE PHOTOMODIFICATION
   DISORDERED CLUSTERS
   NUMERICAL-SIMULATION
   SPECTRAL DEPENDENCE
   PARTICULATE MATTER
   LIGHT-SCATTERING
Кл.слова (ненормированные):
carbon -- iron -- palladium -- silver -- article -- dipole -- electromagnetic field -- geometry -- mathematical analysis -- molecular interaction -- nanoparticle -- radiation absorption
Аннотация: We calculate the quasistatic electromagnetic density of states for aggregates of touching spheres, in particular, linear chains and computer-generated random fractal aggregates. Multipole moments with orders of up to L=64 are taken into account for random aggregates with the number of particles of up to N=100 and up to L=8000 for linear chains. Extensive comparisons with the dipole approximation and geometrical cluster renormalization method are performed. Extinction spectra are calculated for several metals and black carbon. Long wavelength electromagnetic properties of fractal aggregates are considered in details.

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Держатели документа:
Univ Penn, Dept Radiol, Philadelphia, PA 19104 USA
Jackson State Univ, Dept Phys, Jackson, MS 39217 USA
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Moscow Inst Phys & Technol, Dolgoprudnyi 141700, Russia
Krasnoyarsk State Tech Univ, Dept Phys & Engn, Krasnoyarsk 660028, Russia
Natl Acad Sci Ukraine, Inst Surface Chem, UA-03164 Kiev, Ukraine
ИФ СО РАН
Department of Radiology, University of Pennsylvania, Philadelphia, PA 19104, United States
Department of Physics, Jackson State University, Jackson, MS 39217, United States
L. V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation
Moscow Inst. of Phys. and Technology, Dolgoprudny, Moscow Region 141700, Russian Federation
Dept. of Physics, and Engineering, Krasnoyarsk State Tech. University, Krasnoyarsk 660028, Russian Federation
Institute of Surface Chemistry, Natl. Academy of Sciences of Ukraine, 17 General Naumov St., 03164 Kiev, Ukraine

Доп.точки доступа:
Markel, V. A.; Pustovit, V. N.; Karpov, S. V.; Карпов, Сергей Васильевич; Obuschenko, A. V.; Gerasimov, V. S.; Герасимов, Валерий Сергеевич; Isaev, I. L.; Исаев, Иван Леонидович
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Local anisotropy and giant enhancement of local electromagnetic fields in fractal aggregates of metal nanoparticles / S. V. Karpov [et al.] // Phys. Rev. B. - 2005. - Vol. 72, Is. 20. - Ст. 205425, DOI 10.1103/PhysRevB.72.205425. - Cited References: 56 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
SMALL-PARTICLE COMPOSITES
   DIFFUSION-LIMITED AGGREGATION
   OPTICAL-PROPERTIES
   SELECTIVE PHOTOMODIFICATION
   NUMERICAL-SIMULATION
   DISORDERED CLUSTERS
   ABSORPTION-SPECTRUM
   PARTICULATE MATTER
   NONLINEAR OPTICS
   LIGHT-SCATTERING
Аннотация: We have shown within quasistatic approximation that the giant fluctuations of a local electromagnetic field in random fractal aggregates of silver nanospheres are strongly correlated with a local anisotropy factor S which is defined in this paper. The latter is a purely geometrical parameter which characterizes the deviation of local environment of a given nanosphere in an aggregate from spherical symmetry. Therefore, it is possible to predict the sites with anomalously large local fields in an aggregate without explicitly solving the electromagnetic problem. We have also demonstrated that the average (over nanospheres) value of S does not depend noticeably on the fractal dimension D, except when D approaches the trivial limit D=3. In this case, as one can expect, the average local environment becomes spherically symmetrical and S approaches zero. This corresponds to the well-known fact that in trivial aggregates, fluctuations of local electromagnetic fields are much weaker than in fractal aggregates. Thus, we find that, within the quasistatics, the large-scale geometry does not have a significant impact on local electromagnetic responses in nanoaggregates in a wide range of fractal dimensions. However, this prediction is expected not to be correct in aggregates which are sufficiently large for the intermediate- and radiation-zone interaction of individual nanospheres to become important.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Krasnoyarsk State Tech Univ, Dept Phys & Engn, Krasnoyarsk 660028, Russia
Univ Penn, Dept Radiol, Philadelphia, PA 19104 USA
Univ Penn, Dept Bioengn, Philadelphia, PA 19104 USA
ИФ СО РАН
L. V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation
Department of Physics and Engineering, Krasnoyarsk State Technical University, Krasnoyarsk 660028, Russian Federation
Departments of Radiology and Bioengineering, University of Pennsylvania, Philadelphia, PA 19104, United States

Доп.точки доступа:
Karpov, S. V.; Карпов, Сергей Васильевич; Gerasimov, V. S.; Герасимов, Валерий Сергеевич; Isaev, I. L.; Исаев, Иван Леонидович; Markel, V. A.
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Spectroscopic studies of fractal aggregates of silver nanospheres undergoing local restructuring / S. V. Karpov [et al.] // J. Chem. Phys. - 2006. - Vol. 125, Is. 11. - Ст. 111101, DOI 10.1063/1.2229202. - Cited References: 30 . - ISSN 0021-9606

РУБ Physics, Atomic, Molecular & Chemical
Рубрики:
ENHANCED RAMAN-SCATTERING
   SMALL-PARTICLE COMPOSITES
   OPTICAL-PROPERTIES
   DISORDERED CLUSTERS
   NONLINEAR OPTICS
   LOCALIZATION
   NANOPARTICLES
   EIGENMODES
   BOUNDS
Кл.слова (ненормированные):
Large-scale fractal geometry -- Nonlinear optical responses -- Restructuring -- Silver nanospheres -- Aggregates -- Colloids -- Electromagnetic fields -- Fractals -- Nonlinear optics -- Sampling -- Spectroscopic analysis -- Silver
Аннотация: We present an experimental spectroscopic study of large random colloidal aggregates of silver nanoparticles undergoing local restructuring. We argue that such well-known phenomena as strong fluctuation of local electromagnetic fields, appearance of "hot spots" and enhancement of nonlinear optical responses depend on the local structure on the scales of several nanosphere diameters, rather than the large-scale fractal geometry of the sample. (c) 2006 American Institute of Physics.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Krasnoyarsk State Tech Univ, Dept Phys & Engn, Krasnoyarsk 660028, Russia
Univ Penn, Dept Radiol, Philadelphia, PA 19104 USA
Univ Penn, Dept Bioengn, Philadelphia, PA 19104 USA
ИФ СО РАН
L. V. Kirensky Institute of Physics, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk 660036, Russian Federation
Department of Physics and Engineering, Krasnoyarsk State Technical University, Krasnoyarsk 660028, Russian Federation
Departments of Radiology and Bioengineering, University of Pennsylvania, Philadelphia, PA 19104, United States

Доп.точки доступа:
Karpov, S. V.; Карпов, Сергей Васильевич; Gerasimov, V. S.; Герасимов, Валерий Сергеевич; Isaev, I. L.; Исаев, Иван Леонидович; Markel, V. A.
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The model of resonant domain of metal nanoparticle aggregates in pulsed laser fields / A. P. Gavrilyuk, S. V. Karpov // 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, DOI 10.1117/12.752386 . - ISBN 0819468851

ГРНТИ

31.15

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Источник статьи
Держатели документа:
Institute of Computational Modeling,Russian Academy of Science
Institute of Physics,Russian Academy of Science
Доп.точки доступа:
sponsors: SPIE Russia Chapter, National Academy of Sciences, Belarus, Russian Academy of Sciences, Belarus Foundation for Basic Research, Russian Physical Society; Gavrilyuk, A. P.; Karpov, S. V.; Карпов, Сергей Васильевич; ICONO 2007: Novel Photonics Materials; Optics and Optical Diagnostics of Nanostructures(2007 ; 28.05 - 01.06 ; Минск)
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Processes in Resonant Domains of Metal Nanoparticle Aggregates and Optical Nonlinearity of Aggregates in Pulsed Laser Fields [Текст] / A. P. Gavrilyuk, S. V. Karpov // arXiv. - 2008. - Ст. 0808.2355

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Доп.точки доступа:
Gavrilyuk, A.P.; Karpov, S.V.
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    Processes in resonant domains of metal nanoparticle aggregates and optical nonlinearity of aggregates in pulsed laser fields / A. P. Gavrilyuk, S. V. Karpov // Appl. Phys. B-Lasers Opt. - 2009. - Vol. 97, Is. 1. - P163-173, DOI 10.1007/s00340-009-3592-y. - 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] . - SEP. - ISSN 0946-2171
Рубрики:
SMALL-PARTICLE COMPOSITES
   FRACTAL CLUSTERS
   SELECTIVE PHOTOMODIFICATION
   ABSORPTION-COEFFICIENTS
   REFRACTIVE-INDEXES
   SILVER
   ENHANCEMENT
   RESPONSES
   GOLD
Кл.слова (ненормированные):
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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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Computat Modeling, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660028, Russia

Доп.точки доступа:
Gavrilyuk, A. P.; Гаврилюк, Анатолий Петрович; Karpov, S. V.; Карпов, Сергей Васильевич
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Описание изобретения к патенту 2351064


    Способ рекуперации электрической энергии в импульсных установках и устройство для его осуществления / Д. А. Великанов ; патентообладатель Институт физики им. Л.В. Киренского Сибирского отделения РАН. - № 2007126455/09 ; Заявл. 11.07.2007 // Изобретения. Полезные модели : офиц. бюл. Фед. службы по интеллектуал. собственности (Роспатент). - 2009. - № 9
   Перевод заглавия: Method of electric energy recuperation in impulse aggregates, and device for method implementation
Аннотация: Изобретение относится к электротехнике и может быть использовано для генерации импульсов в активно-индуктивных нагрузках. Технический результат состоит в снижении тепловых потерь при перезарядке, в получении однополярных импульсов тока, в отсутствии необходимости коммутации полярности тока дозарядки, в упрощении конструкции и схемы управления ключом. Способ рекуперации электрической энергии заключается в преобразовании магнитной энергии электрического тока, полученной в результате преобразования энергии заряженного емкостного накопителя в магнитную энергию электрического тока, в энергию емкостного накопителя. В течение одного цикла работы импульсной установки преобразование энергии емкостного накопителя в магнитную энергию электрического тока и наоборот производится дважды. На первом этапе энергия емкостного накопителя преобразуется в магнитную энергию тока в активно-индуктивной нагрузке с последующей рекуперацией энергии в емкостный накопитель. На втором этапе энергия емкостного накопителя преобразуется в магнитную энергию тока в катушке индуктивности с последующей рекуперацией энергии в емкостный накопитель. Устройство содержит подключаемый к зарядному устройству емкостный накопитель энергии, параллельно которому подключены последовательно соединенные активно-индуктивная нагрузка и первый ключ. В него введена цепь из последовательно соединенных катушки индуктивности и второго ключа, которая подключена параллельно емкостному накопителю энергии. Первый вывод емкостного накопителя, первый вывод активно-индуктивной нагрузки и первый вывод катушки индуктивности соединены между собой и подключаются к положительному выводу зарядного устройства. Второй вывод активно-индуктивной нагрузки подключен к аноду первого ключа, второй вывод катушки индуктивности подключен к катоду второго ключа. Второй вывод емкостного накопителя, катод первого ключа и анод второго ключа соединены между собой и подключаются к отрицательному выводу зарядного устройства. 2 н. и 5 з.п. ф-лы, 3 ил.
Invention concerns electric equipment and can be applied for impulse generation in active inductance loads. Method of electric power recuperation involves transformation of magnetic energy of electric current, obtained by transformation of charged capacitive storage energy into magnetic energy of electric current, into capacitive storage energy. During one cycle of impulse aggregate operation capacitive storage energy to magnetic energy of electric current and back is performed twice. At the first stage, capacitive storage energy is transformed into magnetic current energy in active inductance load with further energy recuperation to capacitive storage. At the second stage, capacitive storage energy is transformed into magnetic current energy in inductance coil with further energy recuperation to capacitive storage. Device includes capacitive storage connected to charging device and parallel to sequence of active inductance load and first key. Additionally device includes a circuit of sequential inductance coil and second key, circuit connected parallel to capacitive storage. First output of capacitive storage, first output of active inductance load and first output of inductance coil are interconnected and connected to positive output of charging device. Second output of active inductance load is connected to anode of first key, second output of inductance coil is connected to cathode of second key. Second output of capacitive storage, cathode of first key and anode of second key are interconnected and connected to negative output of charging device./p p num="34"EFFECT: reduced heat loss during recharge, obtaining monopolar current impulses, eliminated necessity of charge current polarity commutation, simplified construction and key control scheme./p p num="35"7 cl, 3 dwg, 2 ex/p

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Держатели документа:
Институт физики им. Л.В. Киренского Сибирского отделения РАН

Доп.точки доступа:
Великанов, Дмитрий Анатольевич; Институт физики им. Л.В. Киренского Сибирского отделения РАНФедеральная служба по интеллектуальной собственности (Роспатент); Федеральный институт промышленной собственности
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Dynamic Changes of Optical Characteristics of Resonant Domains in Metal Nanoparticle Aggregates under Pulsed Laser Fields [Text] / Gavrilyuk A.P., Karpov S.V. // Applied Physics B: Lasers and Optics. - 2010. - Vol. 101. - P512

Доп.точки доступа:
Gavrilyuk, A.P.; Karpov, S.V.
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10.

Dynamic changes of optical characteristics of resonant domains in metal nanoparticle aggregates under pulsed laser fields [Text] / A. P. Gavrilyuk, S. V. Karpov. // Technical digest International conference ICONO/LAT 2010. - Казань, 2010. - Ст. ITuQ39

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Gavrilyuk, A.P.; Karpov., S.V.; International Conference on Coherent and Nonlinear Optics(2010 ; Aug. ; 23-26 ; Казань); International Conference on Lasers, Applications, and Technologies(2010 ; Aug. ; 23-26 ; Казань)
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11.

Transformation of the local structure of photomodified disordered aggregates of silver nanoparticles and its manifestations in the spectra of plasmon absorption [Text] / S. V. Karpov, I. L. Isaev [et al.] // Technical digest International conference ICONO/LAT 2010. - Казань, 2010. - Ст. IThO32

Доп.точки доступа:
Karpov, S.V.; Isaev, I.L.; Gavrilyuk, A.P.; Gerasimov, V.S.; Grachev, A.S.; International Conference on Coherent and Nonlinear Optics(2010 ; Aug. ; 23-26 ; Казань); International Conference on Lasers, Applications, and Technologies(2010 ; Aug. ; 23-26 ; Казань)
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12.

Effects of size polydispersity on the extinction spectra of colloidal nanoparticle aggregates / A. E. Ershov [et al.] // Phys. Rev. B. - 2012. - Vol. 85, Is. 4. - Ст. 045421. - P. , DOI 10.1103/PhysRevB.85.045421. - Cited References: 41. - This work was supported by grants from the following foundations of the Russian Federation: Presidium of RAS, OFN RAS, and SB RAS. . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
METAL FRACTAL CLUSTERS
   OPTICAL-PROPERTIES
   ABSORPTION
   NONLINEARITIES
   COMPOSITES
   SCATTERING
   PARTICLES
   SPHERES
   GRAINS
Аннотация: We investigate the effect of particle polydispersity on the optical extinction spectra of colloidal aggregates of spherical metallic (silver) nanoparticles, taking into account the realistic interparticle gaps caused by layers of stabilizing polymer adsorbed on the metal surface (adlayers). The spectra of computer-generated aggregates are computed using two different methods. The coupled-multipole method is used in the quasistatic approximation and the coupled-dipole method beyond the quasistatics. The latter approach is applicable if the interparticle gaps are sufficiently wide relative to the particle radii. Simulations are performed for two different particle size distribution functions (bimodal and Gaussian), varying the number of particles per aggregate, and different distribution functions of the interparticle gap width. The strong influence of the latter factor on the spectra is demonstrated and investigated in detail.

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Держатели документа:
[Ershov, Alexander E.
Isaev, Ivan L.
Semina, Polina N.
Karpov, Sergei V.] Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ershov, Alexander E.
Karpov, Sergei V.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Markel, Vadim A.] Univ Penn, Dept Bioengn, Dept Radiol, Philadelphia, PA 19104 USA
[Markel, Vadim A.] Univ Penn, Grad Grp Appl Math & Computat Sci, Philadelphia, PA 19104 USA

Доп.точки доступа:
Ershov, A. E.; Ершов, Александр Евгеньевич; Isaev, I. L.; Исаев, Иван Леонидович; Semina, P. N.; Семина, Полина Николаевна; Markel, V. A.; Karpov, S. V.; Карпов, Сергей Васильевич
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13.

    Карпов, Сергей Васильевич.
    Оптическая память агрегатов металлических наночастиц / С. В. Карпов // Фотоника. - 2012. - Т. 33, № 2. - С. 52-61 . - ISSN 1993-7296
   Перевод заглавия: Metallic Nanoparticles Aggregates Optical Memory
Аннотация: Исследование наноколлоидов представ- ляет практический интерес. Их можно использовать для повышения чувстви- тельности спектральных методов ана- лиза состава веществ, в устройствах оптической записи информации, для создания новых типов метаматериалов и синтеза самоорганизующихся сверх- решеток различной размерности, вклю- чая фотонные кристаллы, которые могут найти применение в наносенсорике и в задачах управления электромагнит- ным излучением на наномасштабах. В статье показано, что ключевую роль в оптических эффектах играет локаль- ная анизотропия окружения частиц в агрегате другими его частицами.
Nanocolloids investigation has practical interest. Nanocolloids can be used for sensitivity enhancement of spectral compositional analysis methods sensitivity, in optical information recording systems, for creation of new mathamaterials types and for synthesis of self-organizing different dimension superlattices, including photon crystals that can be used in nanosensory and for solution problems of nanoscale controlling electromagnetic emission. The key role of local anisotropy of particles surrounding the aggregate particles in optical effects is discussed.

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Держатели документа:
Институт физики им. Л.В. Киренского СО РАН

Доп.точки доступа:
Karpov, S. V.
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14.

Optodynamic and photochrome effects in composite media with aggregates of plasmonic nanoparticles in pulsed laser fields / A. E. Ershov [et al.] // ICONO/LAT 2013 : Advance conference program. - 2013. - P.

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Доп.точки доступа:
Ershov, A. E.; Ершов, Александр Евгеньевич; Gavrilyuk, A. P.; Karpov, S. V.; Карпов, Сергей Васильевич; Semina, P. N.; Семина, Полина Николаевна; International Conference on Lasers, Applications, and Technologies (LAT 2013) (2013 ; June ; 18-22 ; Moscow)
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15.

Optodynamic phenomena in aggregates of polydisperse plasmonic nanoparticles / A. E. Ershov [et al.] // Appl. Phys. B. - 2014. - Vol. 115, Is. 4. - P. 547-560, DOI 10.1007/s00340-013-5636-6. - 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. . - ISSN 0946-2171. - ISSN 1432-0649

РУБ Optics + Physics, Applied
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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Держатели документа:
Russian Acad Sci, LV Kirenski Inst Phys, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Computat Modeling, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660028, Russia

Доп.точки доступа:
Ershov, A. E.; Ершов, Александр Евгеньевич; Gavrilyuk, A. P.; Karpov, S. V.; Карпов, Сергей Васильевич; Semina, P. N.; Семина, Полина Николаевна; 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]
}
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16.

Effect of local environment in resonant domains of polydisperse plasmonic nanoparticle aggregates on optodynamic processes in pulsed laser fields / A. E. Ershov [et al.] // Chin. Phys. B. - 2015. - Vol. 24, Is. 4. - Ст. 047804, DOI 10.1088/1674-1056/24/4/047804. - 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). . - ISSN 1674. - ISSN 1741-4199. -

РУБ Physics, Multidisciplinary
Рубрики:
METAL NANOPARTICLES
GOLD NANOPARTICLES
OPTICAL-PROPERTIES
Кл.слова (ненормированные):
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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Держатели документа:
Russian Acad Sci, LV Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Russian Acad Sci, Inst Computat Modeling, Krasnoyarsk 660036, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Siberian Fed Univ, Krasnoyarsk 660028, Russia

Доп.точки доступа:
Ershov, A. E.; Ершов, Александр Евгеньевич; Gavrilyuk, A. P.; Karpov, S. V.; Карпов, Сергей Васильевич; Semina, P. N.; Семина, Полина Николаевна; Russian Academy of Sciences [24.29, 24.31, III.9.5, 43, SB RAS-SFU (101), 3-9-5]
}
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17.

Gerasimov, V. S.
Variations in extinction spectra of plasmonic nanoparticle aggregates upon deformation during deposition on planar dielectric substrate / V. S. Gerasimov, I. L. Rasskazov, S. V. Karpov // Annual Int. Conf. "Days on Diffraction". - 2015. - P. 141-142

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Доп.точки доступа:
Rasskazov, I. L.; Рассказов, Илья Леонидович; Karpov, S. V.; Карпов, Сергей Васильевич; Герасимов, Валерий Сергеевич; "Days on diffraction", International conference(2015 ; may ; 25-29 ; St. Petersburg); Санкт-Петербургское отделение Института математики им. В. А. Стеклова; Санкт-Петербургский государственный университет; Euler International Mathematical Institute; Российский фонд фундаментальных исследований
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18.

Restructuring of plasmonic nanoparticle aggregates with arbitrary particle size distribution in pulsed laser fields / A. E. Ershov [et al.] // Chin. Phys. B. - 2016. - Vol. 25, Is. 11. - Ст. 117806, DOI 10.1088/1674-1056/25/11/117806. - 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. . - ISSN 1674-1056
Кл.слова (ненормированные):
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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Держатели документа:
Institute of Computational Modeling, Russian Academy of Sciences, Krasnoyarsk, Russian Federation
L. V. Kirensky Institute of Physics of the Russian Academy of Sciences, Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Ershov, A. E.; Gavrilyuk, A. P.; Karpov, S. V.; Карпов, Сергей Васильевич; Polyutov, S. P.
}
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19.

Ershov, A. E.
Plasmonic nanoparticle aggregates in high-intensity laser fields: effect of pulse duration / A. E. Ershov, A. P. Gavrilyuk, S. V. Karpov // Plasmonics. - 2016. - Vol. 11, No. 2. - P. 403-410, DOI 10.1007/s11468-015-0054-8. - Cited References: 20. - Authors are thankful to Prof. V.A. Markel (University of Pennsylvania) for supplying program codes with realization of coupled dipole method for polydisperse nanoparticle aggregates. 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 (Reference number 1792) . - ISSN 1557-1955

РУБ Chemistry, Physical + Nanoscience & Nanotechnology + Materials Science, Multidisciplinary
Рубрики:
METAL NANOPARTICLES
Кл.слова (ненормированные):
Nanoparticle -- Surface plasmon -- Colloidal aggregate -- Optodynamics
Аннотация: We use an optodynamic model to study the interaction of pulsed laser radiation of different duration with mono- and polydisperse dimers and trimers of plasmonic nanoparticles as resonant domains of colloid Ag multiparticle aggregates. A comparative analysis of the influence of pulse duration on the kinetic characteristics of domains accompanied by the change in their local structure was carried out taking into account the intensity of incident radiation. The obtained results explain the reasons for laser photochromic reactions in materials containing colloidal aggregates of plasmonic nanoparticles.

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Доп.точки доступа:
Gavrilyuk, A. P.; Karpov, S. V.; Карпов, Сергей Васильевич; Ершов, Александр Андреевич
}
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20.

Morozov, E. V.
Reversibility of asphaltene aggregation as revealed by magnetic resonance imaging in situ / E. V. Morozov, O. N. Martyanov // Energy Fuels. - 2017. - Vol. 31, Is. 10. - P. 10639-10647, DOI 10.1021/acs.energyfuels.7b01755. - Cited References: 56. - This research was performed on the equipment of Krasnoyarsk Regional Research Equipment Centre of Siberian Branch of Russian Academy of Sciences with the financial support of Russian Science Foundation (Project No. 15-19-00119). . - ISSN 0887-0624
Кл.слова (ненормированные):
Aggregates -- Crude oil -- Flocculation -- Heavy oil production -- Magnetic resonance imaging -- Asphaltene aggregates -- Asphaltene aggregation -- Asphaltene precipitation -- Equilibrium compositions -- Flocculant concentrations -- Inhomogeneous distribution -- Mechanical stirring -- Multi-component systems -- Asphaltenes
Аннотация: Aggregation of asphaltenes followed by precipitation presents severe problems for existing technologies in the production, recovery, and processing of heavy oils. Better understanding of asphaltene behavior behind the processes of their precipitation and dissolution is vital to address this issue. While investigating the inhomogeneity of different oil systems, the reversibility of the asphaltene aggregation process initiated by flocculant in either asphaltene solution in toluene or crude heavy oil was revealed and investigated using magnetic resonance imaging methods. It was found that the inhomogeneous distribution of the flocculant initiates local spatial-selective asphaltene aggregation registered in a thin layer around the flocculant/oil sample interface. The local excess of flocculant concentration over the threshold of asphaltene precipitation onset is a driving force of this process. As the flocculant diffuses into the volume of the sample, a decrease of the asphaltene flocculated area is observed until it disappears when the equilibrium composition throughout the whole volume of the system is achieved. Depending on the overall flocculant concentration, the asphaltene aggregation may not be reversible and could be followed by subsequent precipitation of the asphaltene aggregates. The similarity of the phenomena observed for the model asphaltene solutions and crude heavy oil samples was established. Partial mechanical stirring of the multicomponent system comprising flocculant and oil or asphaltene solution does not prevent the formation of the local zones with increased concentration of asphaltene aggregates; those sizes evolve depending on the flocculant concentration. The results obtained in this work are consistent with the generally accepted concept of asphaltene precipitation reversibility depending on the system composition and are compatible with the observations obtained by other methods. The approach presented can provide deeper insight into the asphaltene precipitation reversibility issue and can facilitate the understanding of asphaltene behavior in heavy oils.

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Держатели документа:
Institute of Chemistry and Chemical Technology, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/24, Krasnoyarsk, Russian Federation
Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, Russian Federation
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Pr. Ak. Lavrentieva 5, Novosibirsk, Russian Federation
Novosibirsk State University, Pirogova str. 2, Novosibirsk, Russian Federation

Доп.точки доступа:
Martyanov, O. N.; Морозов, Евгений Владимирович
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