Rheological State Diagrams for Rough Colloids in Shear Flow
To assess the role of particle roughness in the rheological phenomena of concentrated colloidal suspensions, we develop model colloids with varying surface roughness length scales up to 10% of the particle radius. Increasing surface roughness shifts the onset of both shear thickening and dilatancy t...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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American Physical Society
2017
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| Online Access: | http://hdl.handle.net/1721.1/112972 https://orcid.org/0000-0001-6031-3779 |
| _version_ | 1826203934573723648 |
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| author | Hsiao, Lilian C. Glynos, Emmanouil Green, Peter F. Larson, Ronald G. Solomon, Michael J. Jamali, Seyedsafa |
| author2 | Massachusetts Institute of Technology. Department of Chemical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Chemical Engineering Hsiao, Lilian C. Glynos, Emmanouil Green, Peter F. Larson, Ronald G. Solomon, Michael J. Jamali, Seyedsafa |
| author_sort | Hsiao, Lilian C. |
| collection | MIT |
| description | To assess the role of particle roughness in the rheological phenomena of concentrated colloidal suspensions, we develop model colloids with varying surface roughness length scales up to 10% of the particle radius. Increasing surface roughness shifts the onset of both shear thickening and dilatancy towards lower volume fractions and critical stresses. Experimental data are supported by computer simulations of spherical colloids with adjustable friction coefficients, demonstrating that a reduction in the onset stress of thickening and a sign change in the first normal stresses occur when friction competes with lubrication. In the quasi-Newtonian flow regime, roughness increases the effective packing fraction of colloids. As the shear stress increases and suspensions of rough colloids approach jamming, the first normal stresses switch signs and the critical force required to generate contacts is drastically reduced. This is likely a signature of the lubrication films giving way to roughness-induced tangential interactions that bring about load-bearing contacts in the compression axis of flow. |
| first_indexed | 2024-09-23T12:45:45Z |
| format | Article |
| id | mit-1721.1/112972 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T12:45:45Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/1129722022-10-01T10:58:13Z Rheological State Diagrams for Rough Colloids in Shear Flow Hsiao, Lilian C. Glynos, Emmanouil Green, Peter F. Larson, Ronald G. Solomon, Michael J. Jamali, Seyedsafa Massachusetts Institute of Technology. Department of Chemical Engineering Jamali, Seyedsafa To assess the role of particle roughness in the rheological phenomena of concentrated colloidal suspensions, we develop model colloids with varying surface roughness length scales up to 10% of the particle radius. Increasing surface roughness shifts the onset of both shear thickening and dilatancy towards lower volume fractions and critical stresses. Experimental data are supported by computer simulations of spherical colloids with adjustable friction coefficients, demonstrating that a reduction in the onset stress of thickening and a sign change in the first normal stresses occur when friction competes with lubrication. In the quasi-Newtonian flow regime, roughness increases the effective packing fraction of colloids. As the shear stress increases and suspensions of rough colloids approach jamming, the first normal stresses switch signs and the critical force required to generate contacts is drastically reduced. This is likely a signature of the lubrication films giving way to roughness-induced tangential interactions that bring about load-bearing contacts in the compression axis of flow. National Science Foundation (U.S.) (Award 1232937) National Science Foundation (U.S.) (Award 1602183) United States. Army Research Office (Grant W911NF10-1-0518) 2017-12-29T16:22:40Z 2017-12-29T16:22:40Z 2017-10 2017-05 2017-11-14T22:44:41Z Article http://purl.org/eprint/type/JournalArticle 0031-9007 1079-7114 http://hdl.handle.net/1721.1/112972 Hsiao, Lilian C. et al. "Rheological State Diagrams for Rough Colloids in Shear Flow." Physical Review Letters 119, 15 (October 2017): 158001 © 2017 American Physical Society https://orcid.org/0000-0001-6031-3779 en http://dx.doi.org/10.1103/PhysRevLett.119.158001 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. American Physical Society application/pdf American Physical Society American Physical Society |
| spellingShingle | Hsiao, Lilian C. Glynos, Emmanouil Green, Peter F. Larson, Ronald G. Solomon, Michael J. Jamali, Seyedsafa Rheological State Diagrams for Rough Colloids in Shear Flow |
| title | Rheological State Diagrams for Rough Colloids in Shear Flow |
| title_full | Rheological State Diagrams for Rough Colloids in Shear Flow |
| title_fullStr | Rheological State Diagrams for Rough Colloids in Shear Flow |
| title_full_unstemmed | Rheological State Diagrams for Rough Colloids in Shear Flow |
| title_short | Rheological State Diagrams for Rough Colloids in Shear Flow |
| title_sort | rheological state diagrams for rough colloids in shear flow |
| url | http://hdl.handle.net/1721.1/112972 https://orcid.org/0000-0001-6031-3779 |
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