Diffusion of gold nanoparticles in porous silica monoliths determined by dynamic light scattering

Wu W, Cui J, Sultan U, Gromotka L, Malgaretti P, Damm C, Harting J, Vogel N, Peukert W, Inayat A, Fröba AP (2023)

Publication Language: English

Publication Type: Journal article, Original article

Publication year: 2023

Journal

Journal of Colloid and Interface Science Elsevier

Book Volume: 641

Pages Range: 251-264

DOI: 10.1016/j.jcis.2023.03.045

Abstract

Hypothesis: The applicability of the dynamic light scattering method for the determination of particle diffusivity under confinement without applying refractive index matching was not adequately explored so far. The confinement effect on particle diffusion in a porous material which is relevant for particle chromatography has also not yet been fully characterized. Experiments: Dynamic light scattering experiments were performed for unimodal dispersions of 11-mercaptoundecanoic acid-capped gold nanoparticles. Diffusion coefficients of gold nanoparticles in porous silica monoliths were determined without limiting refractive index matching fluids. Comparative experiments were also performed with the same nanoparticles and porous silica monolith but applying refractive index matching. Findings: Two distinct diffusivities could be determined inside the porous silica monolith, both smaller than that in free media, showing a slowing-down of the diffusion processes of nanoparticles under confinement. While the larger diffusivity can be related to the slightly slowed-down diffusion of particles in the bulk of the pores and in the necks connecting individual pores, the smaller diffusivity might be related to the diffusion of particles near the pore walls. It shows that the dynamic light scattering method with a heterodyne detection scheme can be used as a reliable and competitive tool for determining particle diffusion under confinement.

Authors with CRIS profile

Wenchang Wu Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP) Junwei Cui Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP) Umair Sultan Sonderforschungsbereich 1411 Produktgestaltung disperser Systeme / Design of Particulate Products Lukas Hartmann Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Cornelia Damm Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Nicolas Vogel Professur für Partikelsynthese Wolfgang Peukert Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Alexandra Inayat Lehrstuhl für Chemische Reaktionstechnik Andreas Paul Fröba Institute of Advanced Optical Technologies - Thermophysical Properties (AOT-TP)

Additional Organisation(s)

Erlangen Graduate School in Advanced Optical Technologies Exzellenz-Cluster Engineering of Advanced Materials

Related research project(s)

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

Involved external institutions

Forschungszentrum Jülich / Research Centre Jülich (FZJ) DE Germany (DE)

How to cite

APA:

Wu, W., Cui, J., Sultan, U., Gromotka, L., Malgaretti, P., Damm, C.,... Fröba, A.P. (2023). Diffusion of gold nanoparticles in porous silica monoliths determined by dynamic light scattering. Journal of Colloid and Interface Science, 641, 251-264. https://doi.org/10.1016/j.jcis.2023.03.045

MLA:

Wu, Wenchang, et al. "Diffusion of gold nanoparticles in porous silica monoliths determined by dynamic light scattering." Journal of Colloid and Interface Science 641 (2023): 251-264.

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