De Lisio, Corrado (2006) Characterization of nanometric carbon materials by time-resolved fluorescence polarization anisotropy. [Pubblicazione in rivista scientifica]

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Item Type: Pubblicazione in rivista scientifica
Lingua: English
Title: Characterization of nanometric carbon materials by time-resolved fluorescence polarization anisotropy
De Lisio, CorradoUNSPECIFIED
Autore/i: A. Bruno, M. Alfè, B. Apicella, C. de Lisio, P. Minutolo
Date: 2006
Number of Pages: 15
Department: Scienze fisiche
Identification Number: 10.1016/j.optlaseng.2005.03.013
Official URL:
Journal or Publication Title: OPTICS AND LASERS IN ENGINEERING
Publisher: -London: Applied Science Publishers. -Elsevier Applied Science:An Imprint of Elsevier Science Ltd, The Boulevard, Langford Lane, Kidlington Oxford OX5 1GB United Kingdom:011 44 1865 843000, 011 44 1865 843699, EMAIL: OR usinfo-f@els
Date: 2006
Volume: 44
Page Range: pp. 732-746
Number of Pages: 15
Uncontrolled Keywords: Nanometric particulate, Fluorescence anisotropy, Carbon materials
Identification Number: 10.1016/j.optlaseng.2005.03.013
Date Deposited: 20 Oct 2010 08:01
Last Modified: 30 Apr 2014 19:42


In this work, time-resolved fluorescence polarization anisotropy (TRFPA) technique has been applied to the determination of the average size of asphaltenes and combustion-generated carbon nanoparticles. The characteristic depolarization time of fluorescence light following photon absorption is related to the typical particle size through the Stoke–Einstein rotational diffusion equation. The TRFPA technique employed in our experiment achieves subnanosecond time resolution, roughly corresponding to sub-nanometer accuracy in determining the particle size. The technique has been applied to both asphaltene and carbon nanoparticles, the former being a component of petroleum, whereas the latter result from combustion processes. Therefore, a complete and reliable characterization of such particles is of great importance in oil industry and atmospheric physics, respectively. Although the TRFPA technique has been developed and widely used on molecular and biological samples, it proves to be a very powerful tool for measuring the size of asphaltene and soot particles as small as few nanometers with a resolution of the order of 0.1 nm.


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