Study of geometric parameters of nonspherical nanoparticles by partially depolarized dynamic light scattering
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An improved version of the depolarized dynamic light scattering method, which can be used for determining geometric parameters of nonspherical nanoparticles in liquids, has been proposed. Formulas are obtained that allow us to find the coefficients of translational and rotational diffusion of nanoparticles from autocorrelation functions of scattered light containing polarized and depolarized components in various ratios. This makes it possible to avoid the need to measure a completely depolarized component possessing an extremely low intensity. The proposed improvement presents the possibility of reducing the registration time and improving the signal-to-noise ratio and the accuracy of the results. Measurements of the parameters of multiwall carbon nanotubes in aqueous suspensions have been carried out. The values of the length and diameter of the tubes calculated by the coefficients of diffusion obtained with the help of the proposed method agree with the results of measurements on scanning and transmission electron microscopes.
KeywordsDynamic Light Scattering Polarization Analyzer Rotational Diffusion Dynamic Light Scattering Method Glan Prism
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