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Concentrated suspensions of micrometer-sized particles exhibit a unique rheological behavior that is strongly dependent on the shear rate and shear stress. Corn-starch suspensions, which are starch particles from corn plants, have been extensively studied as model samples for concentrated suspensions exhibiting discontinuous shear thickening (DST) and dynamic shear jamming (SJ). However, starch particles from other plant sources have not yet been investigated, despite their different sizes and shapes. This study investigated the effects of the structural parameters of starch particles by preparing concentrated suspensions of starch particles from 13 different plants at particle fractions of 25%–50% and evaluating their rheological behaviors through steady shear, pull-out, and ball-drop tests. Starch particles can be classified as polygonal and ellipsoidal. The DST and SJ behaviors typically reported for concentrated cornstarch suspensions were confirmed for other starch particles in both particle groups. The ball-drop test demonstrated excellent shock absorption properties for 11 concentrated suspensions of starch particles, except for sago palms. In the case of concentrated suspensions of starch particles, the particle fraction and shear applied were the dominant factors that significantly affected the rheological behavior, whereas the particle shape was not a primary contributor. This study confirms the possibility that the properties of the liquid in a particle suspension can significantly affect the DST and SJ behaviors.

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  This document is the Accepted Manuscript version of a Published Work that appeared in final form in Rheological Properties of Dense Particle Suspensions of Starches: Shear Thickening, Shear Jamming, and Shock Absorption Properties, copyright © 2024 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.langmuir.4c02920

Keyword: Concentrated particle suspensions, Dynamic shear jamming, Discontinuous shear thickening, Brownian particles, Starch particles

Date published: 2024-12-24

Publisher: American Chemical Society (ACS)

Journal:

• Langmuir (ISSN: 07437463)

Funding:

• Acquisition, Technology, and Logistics Agency

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5172

First published URL: https://doi.org/10.1021/acs.langmuir.4c02920

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Updated at: 2025-12-12 08:30:37 +0900

Published on MDR: 2025-12-12 08:24:01 +0900