Determination of Translational and Rotational Diffusivities of Anisotropic Nanoparticles by Heterodyne Polarized and Depolarized Dynamic Light Scattering

Wu W, Chittem P, Meißner F, Damm C, Peukert W, Fröba AP (2024)

Publication Language: English

Publication Status: Published

Publication Type: Journal article, Original article

Publication year: 2024

Journal

Journal of Physical Chemistry C American Chemical Society

Publisher: American Chemical Society

Book Volume: 128

Pages Range: 9116-9129

Journal Issue: 22

DOI: 10.1021/acs.jpcc.4c00918

Abstract

This work presents the determination of translational diffusivities DT and rotational diffusivities DR of gold nanorods and silver nanocubes using polarized and depolarized dynamic light scattering. In combination with a heterodyne detection scheme, the signal-to-noise ratio of the analyzed correlation functions is significantly improved, which reduces the uncertainties in the determined mean lifetimes of the fluctuations studied and, thus, in the diffusivities. The heterodyne detection scheme also simplifies the data evaluation when homodyne conditions cannot be realized. For nanorods with aspect ratios ranging from 3.6 to 4.8, DT and DR were determined with average expanded uncertainties of (6 and 8) %. DT and DR increase with increasing temperature. In contrast, no concentration dependence of the diffusivities could be found for particle concentrations close to infinite dilution. Based on their values and a model in the literature, the length and width of the nanorods could be determined to be in agreement with the values from electron microscopy with deviations of (12 and 16) %. In this work, it was also demonstrated that dynamic light scattering is applicable for the determination of DT and DR for nanocubes with small anisotropy, with expanded uncertainties of (1.4 and 12) %. Due to the small anisotropic contribution to the scattered light, DR could only be obtained by depolarized dynamic light scattering. The experimental DR values are smaller than those calculated theoretically by the Stokes–Einstein–Debye relation, which, however, considers the nanocubes as equivalent spheres.

Authors with CRIS profile

Wenchang Wu Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP) Pranay Chittem Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP) Cornelia Damm Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Wolfgang Peukert Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Andreas Paul Fröba Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP)

Additional Organisation(s)

Erlangen Graduate School in Advanced Optical Technologies

Related research project(s)

Characterisation of diffusion of nanoparticles (SFB 1411 - C03) Design of particulate products (SFB 1411) Jan. 1, 2020 - Dec. 31, 2023

How to cite

APA:

Wu, W., Chittem, P., Meißner, F., Damm, C., Peukert, W., & Fröba, A.P. (2024). Determination of Translational and Rotational Diffusivities of Anisotropic Nanoparticles by Heterodyne Polarized and Depolarized Dynamic Light Scattering. Journal of Physical Chemistry C, 128(22), 9116-9129. https://doi.org/10.1021/acs.jpcc.4c00918

MLA:

Wu, Wenchang, et al. "Determination of Translational and Rotational Diffusivities of Anisotropic Nanoparticles by Heterodyne Polarized and Depolarized Dynamic Light Scattering." Journal of Physical Chemistry C 128.22 (2024): 9116-9129.

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