New Prospects for Particle Characterization Using Analytical Centrifugation with Sector-Shaped Centerpieces

Uttinger M, Boldt S, Wawra S, Freiwald T, Damm C, Walter J, Lerche D, Peukert W (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Particle & Particle Systems Characterization Wiley

DOI: 10.1002/ppsc.202000108

Abstract

Analytical centrifugation (AC) has recently shown great potential for the accurate determination of particle size distributions. The well-established LUMiSizer(R) is customized by a new design allowing for higher rotor speeds, improved thermal insulation, and measurement cell assembly. The latter enables sedimentation analysis of nanoparticles (NPs) in sector-shaped centerpieces. The measurement window of AC experiments is assessed by the Peclet (Pe) number. It is shown that at low Pe numbers (0.7 < Pe < 30), sedimentation, and diffusion can be accurately and simultaneously analyzed from the sedimentation boundaries within one experiment. Moreover, sedimentation properties can be reliably determined up to Pe numbers of 4000. The thermal characteristic throughout the sedimentation analysis is validated by measuring polystyrene particles at elevated temperatures. Moreover, the performance of the setup is demonstrated by determining the sedimentation properties of SiO2 NPs at intermediate Pe numbers in excellent agreement with results from analytical ultracentrifugation experiments. Finally, for the first time, an accurate analysis of the core–shell properties of Au NPs via AC is presented. By combining the analysis of sedimentation and diffusional properties at low Pe numbers, the shell thickness of the stabilizer cetyltrimethylammonium bromide alongside the core diameter distribution of the Au NPs is determined.

Authors with CRIS profile

Maximilian Uttinger Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Simon Wawra Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Tobias Freiwald Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Cornelia Damm Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Johannes Walter Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik Wolfgang Peukert Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik

Related research project(s)

Multidimensional characterisation of nanoparticle ensembles (SFB 1411 - C04) Design of particulate products (SFB 1411) Jan. 1, 2020 - Dec. 31, 2023

Involved external institutions

LUM GmbH DE Germany (DE)

How to cite

APA:

Uttinger, M., Boldt, S., Wawra, S., Freiwald, T., Damm, C., Walter, J.,... Peukert, W. (2020). New Prospects for Particle Characterization Using Analytical Centrifugation with Sector-Shaped Centerpieces. Particle & Particle Systems Characterization. https://dx.doi.org/10.1002/ppsc.202000108

MLA:

Uttinger, Maximilian, et al. "New Prospects for Particle Characterization Using Analytical Centrifugation with Sector-Shaped Centerpieces." Particle & Particle Systems Characterization (2020).

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