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Concentrated particle suspensions exhibit rheological behaviors, such as discontinuous shear thickening (DST) and dynamic shear jamming (SJ), which affect applications such as soft armors. Although the origin of these behaviors in shear-activated particle–particle contacts has been identified, the effect of structural and chemical properties, especially the role of liquids, on these behaviors remains unexplored. Hydrogen bonding in suspensions has been proposed to be essential for particle friction, and therefore, few studies on DST and SJ have focused on non-aqueous suspensions, mainly on liquid media with a hydrogen bonding ability. To identify an alternative mechanism, this study explored the effects of liquid polarity on the rheological behaviors of silica particle suspensions. Owing to their excellent particle dispersion, the DST behaviors of polar liquids were observed, independent of protic and aprotic liquids. In contrast, nonpolar liquids formed particle agglomerates because of the particle–particle attraction and became a paste at a high particle fraction. The SJ behavior was confirmed for three aprotic liquids (propylene carbonate, 1,3-dimethyl-2-imidazolidinone, and N,N-dimethylpropyleneurea), indicating that, besides hydrogen bonding, liquid polarity is another important parameter for silica particle suspensions. The diverse mechanisms of shear-activated particle–particle friction present material design possibilities for the rheological properties of concentrated particle suspensions.

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• In Copyright
  

Keyword: Concentrated particle suspension, Silica microparticle, Non-Newtonian rheology, Discontinuous shear thickening, Dynamic shear jamming, Hydrogen bond, Aprotic liquid

Date published: 2024-11-19

Publisher: American Chemical Society (ACS)

Journal:

• Langmuir (ISSN: 07437463) vol. 40 issue. 46 p. 24241-24256

Funding:

• The acquisition, technology, and logistics agency (ATLA) of Japan

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5160

First published URL: https://doi.org/10.1021/acs.langmuir.4c01547

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Updated at: 2025-12-11 08:30:19 +0900

Published on MDR: 2025-12-11 08:24:25 +0900