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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.

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Authors

Luiz Pereira

Jérémie Vasseur

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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http://creativecommons.org/licenses/by/4.0/

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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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