Heterodyne dynamic light scattering for the characterization of particle dispersions

Wu W, Knoll M, Giraudet C, Rausch MH, Fröba AP (2023)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2023

Journal

Applied Optics Optical Society of America

Book Volume: 62

Pages Range: 8007-8017

Journal Issue: 30

DOI: 10.1364/AO.502659

Abstract

Particle self-diffusivities in unimodal and bimodal aqueous dispersions are characterized by dynamic light scattering (DLS) applying a heterodyne detection scheme. For unimodal dispersions close to infinite dilution, it could be evidenced that pure homodyne conditions cannot be realized, leading to an increasing underestimation of diffusivity with a decreasing concentration. Even for bimodal dispersions and neglecting any local oscillator field, the coherent superposition of scattered light from different particle species hinders a clear assignment of the measured signals and their evaluation for diffusivity. In this case, the impact of a cross term on the determined diffusivities cannot be neglected. The results emphasize that the use of a heterodyne detection scheme in DLS experiments is a key aspect for an accurate determination of particle diffusivities in low-concentrated unimodal and bimodal dispersions.

Authors with CRIS profile

Wenchang Wu Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP) Matthias Knoll Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP) Michael Rausch Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP) Andreas Paul Fröba Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP)

Additional Organisation(s)

Sonderforschungsbereich 1411 Produktgestaltung disperser Systeme / Design of Particulate Products Erlangen Graduate School in Advanced Optical Technologies (SAOT)

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., Knoll, M., Giraudet, C., Rausch, M.H., & Fröba, A.P. (2023). Heterodyne dynamic light scattering for the characterization of particle dispersions. Applied Optics, 62(30), 8007-8017. https://doi.org/10.1364/AO.502659

MLA:

Wu, Wenchang, et al. "Heterodyne dynamic light scattering for the characterization of particle dispersions." Applied Optics 62.30 (2023): 8007-8017.

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