C K, S and Majumdar, S and Sood, AK (2022) Shear jamming and fragility in fractal suspensions under confinement. In: Soft Matter, 18 (46). pp. 8813-8819.
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Abstract
Under applied stress, the viscosity of many dense particulate suspensions increases drastically, a response known as discontinuous shear-thickening (DST). In some cases, the applied stress can even transform the suspension into a solid-like shear jammed state. Although shear jamming (SJ) has been probed for dense suspensions with particles having well-defined shapes, such a phenomenon for fractal objects has not been explored. Here, using rheology and in situ optical imaging, we study the flow behaviour of ultra-dilute fractal suspensions of multi-walled carbon nanotubes (MWCNT) under confinement. We show a direct transition from flowing to SJ state without a precursory DST in fractal suspensions at an onset volume fraction, ϕ ∼ 0.5%, significantly lower than that of conventional dense suspensions (ϕ ∼ 55%). The ultra-low concentration enables us to demonstrate the fragility and associated contact dynamics of the SJ state, which remain experimentally unexplored in suspensions. Furthermore, using a generalized Wyart-Cates model, we propose a generic phase diagram for fractal suspensions that captures the possibility of SJ without prior DST over a wide range of shear stress and volume fractions. © 2022 The Royal Society of Chemistry.
| Item Type: | Journal Article |
|---|---|
| Publication: | Soft Matter |
| Publisher: | Royal Society of Chemistry |
| Additional Information: | The copyright for this article belongs to the Author(s). |
| Keywords: | Fractals; Jamming; Multiwalled carbon nanotubes (MWCN); Shear stress; Volume fraction, Applied stress; Dense particulate suspensions; Dense suspension; Flow behaviours; Fractal objects; Jammed state; Jamming state; Multi-walled-carbon-nanotubes; Optical imaging; Shear thickening, Suspensions (fluids) |
| Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
| Date Deposited: | 13 Jan 2023 10:42 |
| Last Modified: | 13 Jan 2023 10:42 |
| URI: | https://eprints.iisc.ac.in/id/eprint/79138 |
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