Two-Photon Fluorescence Correlation Spectroscopy of Gold Nanoparticles under Stationary and Flow Conditions

AIV-newsletter2014-11-FCS-AuNPIn this work we report two-photon fluorescence correlation spectros- copy experiments run on gold nanoparticles in aqueous solution.

We compare the photophysical properties of nanoparticles obtained by the Turkevich method and by laser ablation as a function of increasing laser power. Fluorescence correlation spectroscopy curves for all nanoparticles show the rotational diffusion contribution at short lag times, even if the residual rotation contrast coefficient at high excitation laser power is lower for laser ablation nanoparticles with respect to Turkevich syntheses.

 

Moreover, in contrast to Turkevich nanoparticles, laser ablation ones do not show an increase of the number of bright tracers in the excitation volume under higher excitation power. Nanoparticles from Turkevich synthesis are also tested as possible flow tracers inside a very simple microfluidic device featuring a single straight channel.

Da |novembre 19th, 2014|Nanotechnology, Pubblicazioni|Commenti disabilitati su Two-Photon Fluorescence Correlation Spectroscopy of Gold Nanoparticles under Stationary and Flow Conditions|

Recent advances in vacuum sciences and applications

from Journal of Physics D: Applied Physics Volume 47 Number 15

Recent advances in vacuum sciences and applications are reviewed. Novel optical interferometer cavity devices enable pressure measurements with ppm accuracy. The innovative dynamic vacuum standard allows for pressure measurements with temporal resolution of 2 ms.

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Vacuum issues in the construction of huge ultra-high vacuum devices worldwide are reviewed. Recent advances in surface science and thin films include new phenomena observed in electron transport near solid surfaces as well as novel results on the properties of carbon nanomaterials.

Da |maggio 8th, 2014|Pubblicazioni, Vacuum Technology|Commenti disabilitati su Recent advances in vacuum sciences and applications|

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