Multiscale Nature of Thixotropy and Rheological Hysteresis in Attractive Colloidal Suspensions under Shear
Colloids with short range attractions self-assemble into sample-spanning structures, whose dynamic nature results in a thermokinematic memory of the deformation history, also referred to as "thixotropy." Here, we study the origins of the thixotropic effect in these time- A nd rate-dependen...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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American Physical Society (APS)
2020
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| Online Access: | https://hdl.handle.net/1721.1/126869 |
| _version_ | 1811077622855106560 |
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| author | Jamali, Safa Armstrong, Robert C McKinley, Gareth H |
| author2 | Massachusetts Institute of Technology. Department of Chemical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Chemical Engineering Jamali, Safa Armstrong, Robert C McKinley, Gareth H |
| author_sort | Jamali, Safa |
| collection | MIT |
| description | Colloids with short range attractions self-assemble into sample-spanning structures, whose dynamic nature results in a thermokinematic memory of the deformation history, also referred to as "thixotropy." Here, we study the origins of the thixotropic effect in these time- A nd rate-dependent materials by investigating hysteresis across different length scales: From particle-level local measurements of coordination number (microscale), to the appearance of density and velocity fluctuations (mesoscale), and up to the shear stress response to an imposed deformation (macroscale). The characteristic time constants at each scale become progressively shorter, and hysteretic effects become more significant as we increase the strength of the interparticle attraction. There are also strong correlations between the thixotropic effects we observe at each scale. |
| first_indexed | 2024-09-23T10:45:57Z |
| format | Article |
| id | mit-1721.1/126869 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:45:57Z |
| publishDate | 2020 |
| publisher | American Physical Society (APS) |
| record_format | dspace |
| spelling | mit-1721.1/1268692022-09-30T22:51:49Z Multiscale Nature of Thixotropy and Rheological Hysteresis in Attractive Colloidal Suspensions under Shear Jamali, Safa Armstrong, Robert C McKinley, Gareth H Massachusetts Institute of Technology. Department of Chemical Engineering Massachusetts Institute of Technology. Hatsopoulos Microfluids Laboratory Massachusetts Institute of Technology. Department of Mechanical Engineering Colloids with short range attractions self-assemble into sample-spanning structures, whose dynamic nature results in a thermokinematic memory of the deformation history, also referred to as "thixotropy." Here, we study the origins of the thixotropic effect in these time- A nd rate-dependent materials by investigating hysteresis across different length scales: From particle-level local measurements of coordination number (microscale), to the appearance of density and velocity fluctuations (mesoscale), and up to the shear stress response to an imposed deformation (macroscale). The characteristic time constants at each scale become progressively shorter, and hysteretic effects become more significant as we increase the strength of the interparticle attraction. There are also strong correlations between the thixotropic effects we observe at each scale. 2020-09-01T15:30:53Z 2020-09-01T15:30:53Z 2019-12 2019-03 2020-07-31T13:21:38Z Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 https://hdl.handle.net/1721.1/126869 Jamali, Safa et al. "Multiscale Nature of Thixotropy and Rheological Hysteresis in Attractive Colloidal Suspensions under Shear." Physical Review Letters 123, 24 (December 2019): 248003 © 2019 American Physical Society en http://dx.doi.org/10.1103/physrevlett.123.248003 Physical Review Letters Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society (APS) APS |
| spellingShingle | Jamali, Safa Armstrong, Robert C McKinley, Gareth H Multiscale Nature of Thixotropy and Rheological Hysteresis in Attractive Colloidal Suspensions under Shear |
| title | Multiscale Nature of Thixotropy and Rheological Hysteresis in Attractive Colloidal Suspensions under Shear |
| title_full | Multiscale Nature of Thixotropy and Rheological Hysteresis in Attractive Colloidal Suspensions under Shear |
| title_fullStr | Multiscale Nature of Thixotropy and Rheological Hysteresis in Attractive Colloidal Suspensions under Shear |
| title_full_unstemmed | Multiscale Nature of Thixotropy and Rheological Hysteresis in Attractive Colloidal Suspensions under Shear |
| title_short | Multiscale Nature of Thixotropy and Rheological Hysteresis in Attractive Colloidal Suspensions under Shear |
| title_sort | multiscale nature of thixotropy and rheological hysteresis in attractive colloidal suspensions under shear |
| url | https://hdl.handle.net/1721.1/126869 |
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