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The Impotence of Non-Brownian Particles on the Gel Transition of Colloidal Suspensions
Journal article   Open access   Peer reviewed

The Impotence of Non-Brownian Particles on the Gel Transition of Colloidal Suspensions

Samantha L. Morelly, Maureen H. Tang and Nicolas J. Alvarez
Polymers, v 9(9), p461
01 Sep 2017
DOI: https://doi.org/10.3390/polym9090461
PMID: 30965763
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://doi.org/10.3390/polym9090461View
Published, Version of Record (VoR)CC BY V4.0,  Open

Abstract

Physical Sciences Polymer Science Science & Technology
The ability to predict transitions in the microstructure of mixed colloidal suspensions is of extreme interest and importance. The data presented here is specific to the case of battery electrode slurries whereby the carbon additive is reported to form strong colloidal gels. Using rheology, we have determined the effect of mixed particle systems on the critical gel transition phi(gel). More specifically, we show that the introduction of a high volume fraction of large non-Brownian particles has little to no effect on phi(gel). Although phi(gel) is unchanged, the larger particles do change the shape of the linear viscoelasticity and the nonlinear yielding behavior. There are interesting similarities to the nonlinear behavior of the colloidal gels with trends observed for colloidal glasses. A comparison of experimental data and the prediction from theory shows that the equation presented by Poon et al. is able to quantitatively predict the transition from a fluid state to a gel state.

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Polymer Science
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