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

Pustovalov VK, Astafyeva LG - Nanoscale Res Lett (2011)

Bottom Line: 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.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.PACS: 42.62.BE. 78.67.

View Article: PubMed Central - HTML - PubMed

Affiliation: Belarusian National Technical University, Independence pr, 65, Minsk, 220013, Belarus. pustovalovv@mail.ru.

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.PACS: 42.62.BE. 78.67. BF.

No MeSH data available.


Related in: MedlinePlus

Efficiency cross sections σsca (a) and σext (b) of laser radiation. With wavelength 633 nm by two-layered spherical system gold NP core and water vapor shell for the radii r0 = 10 nm (1), 20 nm (2), 40 nm (3), 60 nm (4), 80 nm (5), and 100 nm (6), and for the range of system radii r1 = (1 ÷ 10) r0.
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Figure 6: Efficiency cross sections σsca (a) and σext (b) of laser radiation. With wavelength 633 nm by two-layered spherical system gold NP core and water vapor shell for the radii r0 = 10 nm (1), 20 nm (2), 40 nm (3), 60 nm (4), 80 nm (5), and 100 nm (6), and for the range of system radii r1 = (1 ÷ 10) r0.

Mentions: Figure 6 shows the scattering σsca and extinction σext cross sections of probe laser radiation with wavelength 633 nm by two-layered spherical system gold NP core and water vapor shell for the radii r0 = 10, 20, 40, 60, 80, and 100 nm as a function of the radii relations r1/r0 in the interval of radii r1 = (1 to 10) r0. Influence of vapor shell thickness on scattering properties of system NP-vapor shell for probe radiation with wavelength 633 nm is analogical as for the laser radiation with wavelength 532 nm. Character of dependences σsca(r0) and σext(r0) for different values of r0 are similar. Extinction cross section σext is decreased from 2 to 20 times depending on r0, for example, for r0 = 40 nm is decreased from σext = 6.2 × 10-10 cm2 (r1/r0 = 1) to σext = 3 × 10-11 cm2 (r1/r0 = 2) for λ = 633 nm.


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

Pustovalov VK, Astafyeva LG - Nanoscale Res Lett (2011)

Efficiency cross sections σsca (a) and σext (b) of laser radiation. With wavelength 633 nm by two-layered spherical system gold NP core and water vapor shell for the radii r0 = 10 nm (1), 20 nm (2), 40 nm (3), 60 nm (4), 80 nm (5), and 100 nm (6), and for the range of system radii r1 = (1 ÷ 10) r0.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211867&req=5

Figure 6: Efficiency cross sections σsca (a) and σext (b) of laser radiation. With wavelength 633 nm by two-layered spherical system gold NP core and water vapor shell for the radii r0 = 10 nm (1), 20 nm (2), 40 nm (3), 60 nm (4), 80 nm (5), and 100 nm (6), and for the range of system radii r1 = (1 ÷ 10) r0.
Mentions: Figure 6 shows the scattering σsca and extinction σext cross sections of probe laser radiation with wavelength 633 nm by two-layered spherical system gold NP core and water vapor shell for the radii r0 = 10, 20, 40, 60, 80, and 100 nm as a function of the radii relations r1/r0 in the interval of radii r1 = (1 to 10) r0. Influence of vapor shell thickness on scattering properties of system NP-vapor shell for probe radiation with wavelength 633 nm is analogical as for the laser radiation with wavelength 532 nm. Character of dependences σsca(r0) and σext(r0) for different values of r0 are similar. Extinction cross section σext is decreased from 2 to 20 times depending on r0, for example, for r0 = 40 nm is decreased from σext = 6.2 × 10-10 cm2 (r1/r0 = 1) to σext = 3 × 10-11 cm2 (r1/r0 = 2) for λ = 633 nm.

Bottom Line: 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.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.PACS: 42.62.BE. 78.67.

View Article: PubMed Central - HTML - PubMed

Affiliation: Belarusian National Technical University, Independence pr, 65, Minsk, 220013, Belarus. pustovalovv@mail.ru.

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.PACS: 42.62.BE. 78.67. BF.

No MeSH data available.


Related in: MedlinePlus