Magnetorheology in an aging, yield stress matrix fluid
Field-induced static and dynamic yield stresses are explored for magnetorheological (MR) suspensions in an aging, yield stress matrix fluid composed of an aqueous dispersion of Laponite® clay. Using a custom-built magnetorheometry fixture, the MR response is studied for magnetic field strengths up t...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
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Springer Science + Business Media B.V.
2013
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| Online Access: | http://hdl.handle.net/1721.1/79698 https://orcid.org/0000-0001-8323-2779 |
| _version_ | 1826214015530958848 |
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| author | Rich, Jason P. Doyle, Patrick S McKinley, Gareth H |
| author2 | Massachusetts Institute of Technology. Department of Chemical Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Chemical Engineering Rich, Jason P. Doyle, Patrick S McKinley, Gareth H |
| author_sort | Rich, Jason P. |
| collection | MIT |
| description | Field-induced static and dynamic yield stresses are explored for magnetorheological (MR) suspensions in an aging, yield stress matrix fluid composed of an aqueous dispersion of Laponite® clay. Using a custom-built magnetorheometry fixture, the MR response is studied for magnetic field strengths up to 1 T and magnetic particle concentrations up to 30 v%. The yield stress of the matrix fluid, which serves to inhibit sedimentation of dispersed carbonyl iron magnetic microparticles, is found to have a negligible effect on the field-induced static yield stress for sufficient applied fields, and good agreement is observed between field-induced static and dynamic yield stresses for all but the lowest field strengths and particle concentrations. These results, which generally imply a dominance of inter-particle dipolar interactions over the matrix fluid yield stress, are analyzed by considering a dimensionless magnetic yield parameter that quantifies the balance of stresses on particles. By characterizing the applied magnetic field in terms of the average particle magnetization, a rheological master curve is generated for the field-induced static yield stress that indicates a concentration–magnetization superposition. The results presented herein will provide guidance to formulators of MR fluids and designers of MR devices who require a field-induced static yield stress and a dispersion that is essentially indefinitely stable to sedimentation. |
| first_indexed | 2024-09-23T15:58:09Z |
| format | Article |
| id | mit-1721.1/79698 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:58:09Z |
| publishDate | 2013 |
| publisher | Springer Science + Business Media B.V. |
| record_format | dspace |
| spelling | mit-1721.1/796982022-10-02T05:25:33Z Magnetorheology in an aging, yield stress matrix fluid Rich, Jason P. Doyle, Patrick S McKinley, Gareth H Massachusetts Institute of Technology. Department of Chemical Engineering Massachusetts Institute of Technology. Department of Mechanical Engineering Massachusetts Institute of Technology. Hatsopoulos Microfluids Laboratory Doyle, Patrick S. Rich, Jason P. McKinley, Gareth H. Field-induced static and dynamic yield stresses are explored for magnetorheological (MR) suspensions in an aging, yield stress matrix fluid composed of an aqueous dispersion of Laponite® clay. Using a custom-built magnetorheometry fixture, the MR response is studied for magnetic field strengths up to 1 T and magnetic particle concentrations up to 30 v%. The yield stress of the matrix fluid, which serves to inhibit sedimentation of dispersed carbonyl iron magnetic microparticles, is found to have a negligible effect on the field-induced static yield stress for sufficient applied fields, and good agreement is observed between field-induced static and dynamic yield stresses for all but the lowest field strengths and particle concentrations. These results, which generally imply a dominance of inter-particle dipolar interactions over the matrix fluid yield stress, are analyzed by considering a dimensionless magnetic yield parameter that quantifies the balance of stresses on particles. By characterizing the applied magnetic field in terms of the average particle magnetization, a rheological master curve is generated for the field-induced static yield stress that indicates a concentration–magnetization superposition. The results presented herein will provide guidance to formulators of MR fluids and designers of MR devices who require a field-induced static yield stress and a dispersion that is essentially indefinitely stable to sedimentation. Petroleum Research Fund (ACS-PRF Grant No. 49956-ND9) American Chemical Society (ACS-PRF Grant No. 49956-ND9) 2013-07-25T15:25:00Z 2013-07-25T15:25:00Z 2012-05 2012-04 Article http://purl.org/eprint/type/JournalArticle 0035-4511 1435-1528 http://hdl.handle.net/1721.1/79698 Rich, Jason P., Patrick S. Doyle, and Gareth H. McKinley. Magnetorheology in an Aging, Yield Stress Matrix Fluid. Rheologica Acta 51, no. 7 (July 8, 2012): 579-593. https://orcid.org/0000-0001-8323-2779 en_US http://dx.doi.org/10.1007/s00397-012-0632-z Rheologica Acta Creative Commons Attribution-Noncommercial-Share Alike 3.0 http://creativecommons.org/licenses/by-nc-sa/3.0/ application/pdf Springer Science + Business Media B.V. MIT web domain |
| spellingShingle | Rich, Jason P. Doyle, Patrick S McKinley, Gareth H Magnetorheology in an aging, yield stress matrix fluid |
| title | Magnetorheology in an aging, yield stress matrix fluid |
| title_full | Magnetorheology in an aging, yield stress matrix fluid |
| title_fullStr | Magnetorheology in an aging, yield stress matrix fluid |
| title_full_unstemmed | Magnetorheology in an aging, yield stress matrix fluid |
| title_short | Magnetorheology in an aging, yield stress matrix fluid |
| title_sort | magnetorheology in an aging yield stress matrix fluid |
| url | http://hdl.handle.net/1721.1/79698 https://orcid.org/0000-0001-8323-2779 |
| work_keys_str_mv | AT richjasonp magnetorheologyinanagingyieldstressmatrixfluid AT doylepatricks magnetorheologyinanagingyieldstressmatrixfluid AT mckinleygarethh magnetorheologyinanagingyieldstressmatrixfluid |