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119 results on '"Pustovalov, V K"'

2. Significant tunability and absorptivity of plasmonic NiO-Ni nanoshells dispersed in silica in visible and infrared optical spectra.

Author

Pustovalov, V K, Astafyeva, L G, and Fritzsche, W

Abstract

A theoretical study of the optical properties of new NiO-Ni nanoshells (NSs) with different radii and shell thicknesses dispersed in silica was carried out in a wide range of ultraviolet, visible and infrared optical spectra from 200 nm to 5000 nm. The established remarkable tunability of absorption (extinction) spectrum and the high absorption properties of NiO-Ni NSs in the presented spectral ranges are very interesting for use in various photothermal and laser high-temperature technologies, including applications in light-to-heat conversion, solar thermal energy, laser nanomedicine and others. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Light-absorption selection of nanoparticles and nanofluids containing nanoparticles for their effective heating by solar radiation

Author

Pustovalov, V. K., Astafyeva, L.G., and Fritzsche, W.

Abstract

Light-absorption selection of single nanoparticle for solar radiation requires the simultaneous fulfillment of all of the following novel conditions—maximal close (overlap) of the dependence of nanoparticle efficiency absorption factor on wavelength with the dependence solar irradiance, predominant role of nanoparticle absorption over its scattering, the use of maximal values of nanoparticle efficiency absorption factor and its size. These results highlight the possibility for effective application of single homogeneous Ti and core–shell Ti–TiO2, Ni–NiO nanoparticles with radii of about 75 nm as perfect absorbers for solar radiation in the complete optical spectrum 250–2500 nm.

Published
2017

22. Plasmonic and Thermooptical Properties of Spherical Metallic Nanoparticles for Their Thermoplasmonic and Photonic Applications

Author

Pustovalov, V. K., Astafyeva, L. G., and Fritzsche, W.

Abstract

Investigations and use of nanoparticles (NPs) as photothermal (PT) agents in laser and optical nanotechnology are fast growing areas of research and applications. The potential benefits of NPs applications include possibility for thermal imaging and treatment of materials containing of NPs, applications of NPs for light-to-thermal energy conversion, in catalysis, laser nanomedicine, and chemistry. Efficiency of applications of metallic NPs for laser and optical nanotechnology depends on plasmonic and thermophysical properties of NPs, characteristics of radiation, and surroundingmedium. Herewe present the results of comparative analysis of NP properties (plasmonic, thermooptical, and others) allowing selecting their parameters for thermoplasmonic and photonic applications. Plasmonic and thermooptical properties of several metallic (aurum, silver, platinum, cobalt, zinc, nickel, titanium, cuprum, aluminum, molybdenum, vanadium, and palladium) NPs are theoretically investigated and analysis of them is carried out. Investigation of the influence of NPs parameters (type of metal, radii, optical indexes, density, and heat capacity of NP material), characteristics of radiation (wavelength and pulse duration), and ambient parameters on plasmonic and thermophysical properties of NPs has been carried out. It was established that maximum value of thermooptical parameter (maximum NP temperature) can be achieved with the use of absorption efficiency factor of NP smaller than its maximum valu.

Published
2014

23. An Analysis of the Optical Properties of Homogeneous Metal and Oxide Nanoparticles along with Double–Layer Nanoparticles with a Metal Core and an Oxide Shell Aimed at Improving the Efficiency of Absorption of Solar Radiation.

Author

Astaf'eva, L. G., Pustovalov, V. K., and Fritzsche, W.

Subjects
*SOLAR radiation, *METAL nanoparticles, *OPTICAL properties of metals, *RADIATION absorption, *METALLIC oxides, *ABSORPTION coefficients
Abstract

Problems related to using nanoparticles for absorption of solar radiation and photothermal nanotechnologies are now being actively studied. The efficiency of using nanoparticles as photothermal agents for solar energy is determined by their spectral optical properties. We performed computer simulation of optical properties of homogeneous metal (nickel, titanium, and molybdenum) nanoparticles and their oxides, along with nanoparticles consisting of a metal core and an oxide shell, with radii in the range from 50 to 100 nm in the spectral interval between 200 and 2500 nm. The influence of nanoparticle radius, the type of metal and its oxide on spectral coefficients of efficiency absorption (Kabs) and scattering (Ksca) of radiation by nanoparticles is investigated. The type of nanoparticles suitable for absorption of solar radiation was chosen based on a comparative analysis of the wavelength dependences of absorption efficiency coefficients Kabs, intensity of solar radiation IS, and parameter P1 = Kabs/Ksca. Spherical double–layer nanoparticles consisting of nickel or titanium core and oxide shells with a radius of 75 or 100 nm can be used in the spectral interval from 200 to 2500 nm for efficient absorption of solar radiation. These results are a substantial contribution to the investigation of optical properties of nanoparticles that can be used in systems of thermal energy. [ABSTRACT FROM AUTHOR]

Published
2019
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34. Influence of Shell Parameters on Optical Properties of Spherical Metallic Core-Oxide Shell Nanoparticles

Author

Pustovalov, V. K., Astafyeva, L. G., Pustovalov, V. K., and Astafyeva, L. G.

Abstract

Different metal homogeneous nanoparticles have been extensively studied in recent years due to their wide range of potential applications. It is very interesting to investigate core-shell nanoparticles with oxide shell from core metal. The formation of oxide shell on metallic nanoparticles can be achieved by different chemical and physical methods including also natural oxidation of pure metallic nanoparticles in gaseous or liquid media, containing oxygen components (air, water, etc.). We numerically calculated efficiency factors of absorption K-abs, scattering K-sca, and extinction K-ext of radiation with wavelength lambda in the spectral interval 150-1000nm by spherical homogeneous metallic and two-layered (metal core - oxide metal shell) nanoparticles: Al, Al-Al2O3 and Zn, Zn-ZnO with core radii in the range 5-50nm and shell thickness 5 nm. Analysis of presented results has been carried out.

Published
2015

36. Abstracts of articles deposited at VINITI

Author

Partalla, N. A., Rodionova, G. N., Zaitsev, B. E., Fedorova, N. G., Usatenko, Yu. I., Klimkovich, E. A., Chiganina, N. N., Sarapulova, G. I., Fidler, Zh. N., Shibanova, E. F., Shulunova, A. M., Lur'e, F. S., Lopyrev, V. A., and Pustovalov, V. K.

Published
1979
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39. Nonlinear thermo-optical properties of two-layered spherical system of gold nanoparticle core and water vapor shell during initial stage of shell expansion

Author

Pustovalov, V. K., Astafyeva, L. G., Pustovalov, V. K., and Astafyeva, L. G.

Abstract

Nonlinear thermo-optical properties of two-layered spherical system of gold nanoparticle core and water vapor shell, created under laser heating of nanoparticle in water, were theoretically investigated. Vapor shell expansion leads to decreasing up to one to two orders of magnitude in comparison with initial values of scattering and extinction of the radiation with wavelengths 532 and 633 nm by system while shell radius is increased up to value of about two radii of nanoparticle. Subsequent increasing of shell radius more than two radii of nanoparticle leads to rise of scattering and extinction properties of system over initial values. The significant decrease of radiation scattering and extinction by system of nanoparticle-vapor shell can be used for experimental detection of the energy threshold of vapor shell formation and investigation of the first stages of its expansion.

Published
2011

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