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Excitation of nanoscale vapor bubbles at the surface of gold nanoparticles in water
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Extinction spectra for several gold nanoparticle solutions rescaled to the cuvette diameter of . The plasmon resonance shifts to larger wavelengths for increasing particle sizes.

Image of FIG. 2.
FIG. 2.

(a) Thermal expansion coefficient and (b) molar heat capacity of bulk gold as functions of temperature. (c) Resulting specific expansion coefficient, as the ratio of the two material constants.

Image of FIG. 3.
FIG. 3.

(Color online) Lattice expansion of gold particles of 52 and diameters as determined from the peak shift of the (111) powder reflection at (circles) and (crosses) delays together with a calculation of the thermal expansion (lines; dashed line without rescaling, see text). Above no powder reflection at delay is detectable, indicating particle melting.

Image of FIG. 4.
FIG. 4.

(Color online) Temperature evolution of (엯) and (●, Ref. 14) particles together with the calculated temperatures of the particle lattice (upper solid curves) and the adjacent water shell (lower solid curves). The calculated particle lattice temperatures are rescaled so that the calculated temperature rise at matches the experimental particle temperature rise . For better comparison, the dashed lines represent a convolution of the particle temperature curves with the resolution function of the x-ray pulse.

Image of FIG. 5.
FIG. 5.

Calculated temperature profiles around a particle of diameter as function of the radial coordinate from the particle center for delays of 100 and . The temperature within the particle is assumed to be uniform. At the short delay of a discontinuous drop of the temperature across the particle-water interface is a result of the thermal boundary resistance. The temperature before excitation and the water critical temperature are marked by the dashed lines.

Image of FIG. 6.
FIG. 6.

(Color online) Difference in liquid scattering of a sol with gold particles at delay at a fluence of (+) and (●). The solid line is the static derivative , determined for pure water and scaled in amplitude to match the signal height of . A volume change of the bulk water of is derived from that amplitude, which is equivalent to a bubble diameter of . The reduction of powder scattering at the fcc reflections is indicated by the bars.

Image of FIG. 7.
FIG. 7.

Ratio of bubble volume to particle volume as a function of laser fluence for particle sizes of 39 and at the delay of maximum bubble radius ( for particles, for particles). The dashed vertical lines indicate the threshold.

Image of FIG. 8.
FIG. 8.

Dependence of the system properties on particle size. The absorbed proportion (a) of the laser fluence (as calculated using the Mie theory) decreases with particle size due to increased light scattering. The required temperature rise (b) to the calculated melting point (Ref. 34) is reduced through the finite size effect for small particles. The maximum temperature rise (c) in the water phase is derived as a function of particle size from the calculated spatial temperature profiles at the particle melting point. The vapor nucleation temperature relative to the particle temperature at the melting transition is shown for the different particle sizes under study. The open symbols are derived from Fig. 3, while full symbols are deduced from the diffuse scattering. The lines are based on the bubble nucleation threshold occurs at (solid line) and 85% (dashed line), respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Excitation of nanoscale vapor bubbles at the surface of gold nanoparticles in water