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- 저자 : Willbold, Dieter (검색결과 1 건)
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Goossens, Karel,Prior, Mira,Pacheco, Victor,Willbold, Dieter,Mü,llen, Klaus,Enderlein, Jö,rg,Hofkens, Johan,Gregor, Ingo American Chemical Society 2015 ACS NANO Vol.9 No.7
<P>Dual-focus fluorescence correlation spectroscopy (2fFCS) is a versatile method to determine accurate diffusion coefficients of fluorescent species in an absolute, reference-free manner. Whereas (either classical or dual-focus) FCS has been employed primarily in the life sciences and thus in aqueous environments, it is increasingly being used in materials chemistry, as well. These measurements are often performed in nonaqueous media such as organic solvents. However, the diffusion coefficients of reference dyes in organic solvents are not readily available. For this reason we determined the translational diffusion coefficients of several commercially available organosoluble fluorescent dyes by means of 2fFCS. The selected dyes and organic solvents span the visible spectrum and a broad range of refractive indices, respectively. The diffusion coefficients can be used as absolute reference values for the calibration of experimental FCS setups, allowing quantitative measurements to be performed. We show that reliable information about the hydrodynamic dimensions of the fluorescent species (including noncommercial compounds) within organic media can be extracted from the 2fFCS data.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2015/ancac3.2015.9.issue-7/acsnano.5b02371/production/images/medium/nn-2015-02371p_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn5b02371'>ACS Electronic Supporting Info</A></P>
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