Variance analysis of dynamic light scattering data

We propose a novel method alternative to the classical Dynamic Light Scattering (DLS) technique for performing particle sizing on diluted dispersions of nanosized particles. Differently from DLS, which works by determining the correlation function of the intensity scattered by the sample, our method...

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Bibliographic Details
Published in:Review of scientific instruments 2023-09, Vol.94 (9)
Main Authors: Anzini, Pietro, Biganzoli, Davide, Cherniukh, Ihor, Kovalenko, Maksym V., Parola, Alberto, Ferri, Fabio
Format: Article
Language:English
Subjects:
Correlation
Dispersions
Error analysis
Fluorescence
Nanoparticles
Perovskites
Photon correlation spectroscopy
Polystyrene resins
Sampling
Scattering
Scientific apparatus & instruments
Variance analysis
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Summary:We propose a novel method alternative to the classical Dynamic Light Scattering (DLS) technique for performing particle sizing on diluted dispersions of nanosized particles. Differently from DLS, which works by determining the correlation function of the intensity scattered by the sample, our method does not require the use of a correlator because it exploits the behavior of the variance (VAR) of the scattered signal as a function of the sampling time Δt. By using a wide range of sampling times Δtmin ≪ τc ≪ Δtmax, it is possible to recover the correlation time τc of the scattered field and, in turn (by using the Stokes–Einstein relation), the hydrodynamic diameter of the particles. The new method is endowed with an analytical expression for the error bars associated with to the VAR data. Extensive computer simulations carried out on monodisperse and narrow polydisperse samples show that VAR and DLS techniques provide fairly similar performances. The same results were obtained on calibrated polystyrene spheres and fluorescent perovskite nanoparticles tested with different setups and detection schemes.
ISSN:0034-6748
1089-7623
DOI:10.1063/5.0161845