Luiz Pereira
Interparticle and Brownian forces controlling particle aggregation and rheology of silicate melts containing platinum-group element particles
Pereira, Luiz; Vasseur, Jérémie; Wadsworth, Fabian B.; Trixler, Frank; Dingwell, Donald B.
Authors
Jérémie Vasseur
Dr Fabian Wadsworth fabian.b.wadsworth@durham.ac.uk
Associate Professor
Frank Trixler
Donald B. Dingwell
Abstract
We study the rheology of silicate melts containing platinum-group element (PGE) particles. They exhibit a shear-thinning behaviour, an intense aggregation tendency, and an anomalously high apparent viscosity in the low shear rate limit, even at very low particle volume fraction. Using a compilation of published experimental data, we analyse these effects in three steps. Firstly, we observe that the viscosities of these suspensions are much higher than those of natural silicate crystal-bearing melts for low shear rate regimes. Secondly, we demonstrate that the viscosities at low shear rate limit cannot be estimated by classical rheological models but rather may be understood as the result of particle aggregation, trapping dead fluid, and thereby increasing the effective particle volume fraction. Finally, we scale the critical shear rates for shear-thinning using a Peclet number analysis—invoking a competition between random thermal particle motion and hydrodynamic shearing motion—and, using an empirical extension, we additionally account for the particle–particle interaction energetics. We propose a framework in which the rheology of this family of particle-bearing melts can be predicted, and demonstrate that at low Peclet numbers, PGE-bearing particle aggregation is driven by interparticle forces and Brownian motion.
Citation
Pereira, L., Vasseur, J., Wadsworth, F. B., Trixler, F., & Dingwell, D. B. (2022). Interparticle and Brownian forces controlling particle aggregation and rheology of silicate melts containing platinum-group element particles. Scientific Reports, 12(1), Article 9226. https://doi.org/10.1038/s41598-022-12948-1
Journal Article Type | Article |
---|---|
Acceptance Date | May 19, 2022 |
Online Publication Date | Jun 2, 2022 |
Publication Date | 2022 |
Deposit Date | Jul 19, 2022 |
Publicly Available Date | Jul 19, 2022 |
Journal | Scientific Reports |
Publisher | Nature Research |
Peer Reviewed | Peer Reviewed |
Volume | 12 |
Issue | 1 |
Article Number | 9226 |
DOI | https://doi.org/10.1038/s41598-022-12948-1 |
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This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
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