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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 of absorption σabs, scattering σsca, and extinction σext of laser radiation. Efficiency cross sections of absorption σabs (a), scattering σsca (b), and extinction σext (c) of laser radiation with wavelength 532 nm by two-layered spherical system gold NP core and water vapor shell placed in water for the range of NP radii r0 = 5 to 100 nm and radii of system r1 = r0 (1, pure gold NP, straight line) r1 = r0 + 0.1r0 (2, dotted line), r1 = r0 + 1r0 (3, dashed line), r1 = r0 + 2r0 (4, dashed-dotted line), r1 = r0 + 3r0 (5, straight line), and r1 = r0 + 4r0 (6, straight line), and for homogeneous vapor bubble with r0 (7, dashed-double dotted line).
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Figure 1: Efficiency cross sections of absorption σabs, scattering σsca, and extinction σext of laser radiation. Efficiency cross sections of absorption σabs (a), scattering σsca (b), and extinction σext (c) of laser radiation with wavelength 532 nm by two-layered spherical system gold NP core and water vapor shell placed in water for the range of NP radii r0 = 5 to 100 nm and radii of system r1 = r0 (1, pure gold NP, straight line) r1 = r0 + 0.1r0 (2, dotted line), r1 = r0 + 1r0 (3, dashed line), r1 = r0 + 2r0 (4, dashed-dotted line), r1 = r0 + 3r0 (5, straight line), and r1 = r0 + 4r0 (6, straight line), and for homogeneous vapor bubble with r0 (7, dashed-double dotted line).

Mentions: Figure 1 presents efficiency cross sections of absorption σabs, scattering σsca, and extinction σext of laser radiation with wavelength 532 nm by two-layered spherical system gold NP core and water vapor shell, placed in water for the range of NP radii r0 = 5 to 100 nm and radii of system r1 = r0 (pure gold NP), r1 = r0 + 0.1r0, r1 = r0 + 1r0, r1 = r0 + 2r0, r1 = r0 + 3r0, and r1 = r0 + 4r0, and for homogeneous vapor bubble with radius r0 = 5 to 100 nm. Increasing of vapor shell thickness leads to substantial monotonous decreasing of σabs from two to eight times for all range of 5 <r0 < 100 nm and for the interval of shell vapor thicknesses Δr1 <r0, Δr1 = r1-r0. Further increasing of vapor shell thickness weakly influences the σabs. It means that the absorbance of laser radiation by the NP is sharply decreased at formation of thin shielded vapor shell and then it is weakly changed for thick shells. Cross section of absorption σabs for pure vapor bubble is much smaller than σabs for system NP-shell and does not present at Figures 1 and 2.


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 of absorption σabs, scattering σsca, and extinction σext of laser radiation. Efficiency cross sections of absorption σabs (a), scattering σsca (b), and extinction σext (c) of laser radiation with wavelength 532 nm by two-layered spherical system gold NP core and water vapor shell placed in water for the range of NP radii r0 = 5 to 100 nm and radii of system r1 = r0 (1, pure gold NP, straight line) r1 = r0 + 0.1r0 (2, dotted line), r1 = r0 + 1r0 (3, dashed line), r1 = r0 + 2r0 (4, dashed-dotted line), r1 = r0 + 3r0 (5, straight line), and r1 = r0 + 4r0 (6, straight line), and for homogeneous vapor bubble with r0 (7, dashed-double dotted line).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 1: Efficiency cross sections of absorption σabs, scattering σsca, and extinction σext of laser radiation. Efficiency cross sections of absorption σabs (a), scattering σsca (b), and extinction σext (c) of laser radiation with wavelength 532 nm by two-layered spherical system gold NP core and water vapor shell placed in water for the range of NP radii r0 = 5 to 100 nm and radii of system r1 = r0 (1, pure gold NP, straight line) r1 = r0 + 0.1r0 (2, dotted line), r1 = r0 + 1r0 (3, dashed line), r1 = r0 + 2r0 (4, dashed-dotted line), r1 = r0 + 3r0 (5, straight line), and r1 = r0 + 4r0 (6, straight line), and for homogeneous vapor bubble with r0 (7, dashed-double dotted line).
Mentions: Figure 1 presents efficiency cross sections of absorption σabs, scattering σsca, and extinction σext of laser radiation with wavelength 532 nm by two-layered spherical system gold NP core and water vapor shell, placed in water for the range of NP radii r0 = 5 to 100 nm and radii of system r1 = r0 (pure gold NP), r1 = r0 + 0.1r0, r1 = r0 + 1r0, r1 = r0 + 2r0, r1 = r0 + 3r0, and r1 = r0 + 4r0, and for homogeneous vapor bubble with radius r0 = 5 to 100 nm. Increasing of vapor shell thickness leads to substantial monotonous decreasing of σabs from two to eight times for all range of 5 <r0 < 100 nm and for the interval of shell vapor thicknesses Δr1 <r0, Δr1 = r1-r0. Further increasing of vapor shell thickness weakly influences the σabs. It means that the absorbance of laser radiation by the NP is sharply decreased at formation of thin shielded vapor shell and then it is weakly changed for thick shells. Cross section of absorption σabs for pure vapor bubble is much smaller than σabs for system NP-shell and does not present at Figures 1 and 2.

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