Effects of vertical confinement on gelation and sedimentation of colloids
We consider the sedimentation of a colloidal gel under confinement in the direction of gravity. The confinement allows us to compare directly experiments and computer simulations, for the same system size in the vertical direction. The confinement also leads to qualitatively different behaviour comp...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
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The Royal Society of Chemistry
2017
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| Online Access: | http://irep.iium.edu.my/70400/ http://irep.iium.edu.my/70400/1/confine_gel_sedim_razali.pdf http://irep.iium.edu.my/70400/7/70400%20Effects%20of%20vertical%20confinement%20on%20gelation%20SCOPUS.pdf |
| _version_ | 1848787283296124928 |
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| author | Razali, Azaima Fullerton, Christopher J. Turci, Francesco Hallett, James E. Jack, Rob L. Royall, C. Patrick |
| author_facet | Razali, Azaima Fullerton, Christopher J. Turci, Francesco Hallett, James E. Jack, Rob L. Royall, C. Patrick |
| author_sort | Razali, Azaima |
| building | IIUM Repository |
| collection | Online Access |
| description | We consider the sedimentation of a colloidal gel under confinement in the direction of gravity. The confinement allows us to compare directly experiments and computer simulations, for the same system size in the vertical direction. The confinement also leads to qualitatively different behaviour compared to bulk systems: in large systems gelation suppresses sedimentation, but for small systems sedimentation is enhanced relative to non-gelling suspensions, although the rate of sedimentation is reduced when the strength of the attraction between the colloids is strong. We map interaction parameters between a model experimental system (observed in real space) and computer simulations. Remarkably, we find that when simulating the system using Brownian dynamics in which hydrodynamic interactions between the particles are neglected, we find that sedimentation occurs on the same timescale as the experiments. An analysis of local structure in the simulations showed similar behaviour to gelation in the absence of gravity. |
| first_indexed | 2025-11-14T17:22:28Z |
| format | Article |
| id | iium-70400 |
| institution | International Islamic University Malaysia |
| institution_category | Local University |
| language | English English |
| last_indexed | 2025-11-14T17:22:28Z |
| publishDate | 2017 |
| publisher | The Royal Society of Chemistry |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | iium-704002019-07-12T04:00:31Z http://irep.iium.edu.my/70400/ Effects of vertical confinement on gelation and sedimentation of colloids Razali, Azaima Fullerton, Christopher J. Turci, Francesco Hallett, James E. Jack, Rob L. Royall, C. Patrick QC Physics QD Chemistry We consider the sedimentation of a colloidal gel under confinement in the direction of gravity. The confinement allows us to compare directly experiments and computer simulations, for the same system size in the vertical direction. The confinement also leads to qualitatively different behaviour compared to bulk systems: in large systems gelation suppresses sedimentation, but for small systems sedimentation is enhanced relative to non-gelling suspensions, although the rate of sedimentation is reduced when the strength of the attraction between the colloids is strong. We map interaction parameters between a model experimental system (observed in real space) and computer simulations. Remarkably, we find that when simulating the system using Brownian dynamics in which hydrodynamic interactions between the particles are neglected, we find that sedimentation occurs on the same timescale as the experiments. An analysis of local structure in the simulations showed similar behaviour to gelation in the absence of gravity. The Royal Society of Chemistry 2017-05 Article PeerReviewed application/pdf en http://irep.iium.edu.my/70400/1/confine_gel_sedim_razali.pdf application/pdf en http://irep.iium.edu.my/70400/7/70400%20Effects%20of%20vertical%20confinement%20on%20gelation%20SCOPUS.pdf Razali, Azaima and Fullerton, Christopher J. and Turci, Francesco and Hallett, James E. and Jack, Rob L. and Royall, C. Patrick (2017) Effects of vertical confinement on gelation and sedimentation of colloids. Soft Matter, 13 (17). pp. 3230-3239. E-ISSN 1744-6848 https://pubs.rsc.org/en/content/articlelanding/2017/sm/c6sm02221a#!divAbstract |
| spellingShingle | QC Physics QD Chemistry Razali, Azaima Fullerton, Christopher J. Turci, Francesco Hallett, James E. Jack, Rob L. Royall, C. Patrick Effects of vertical confinement on gelation and sedimentation of colloids |
| title | Effects of vertical confinement on gelation and sedimentation of colloids |
| title_full | Effects of vertical confinement on gelation and sedimentation of colloids |
| title_fullStr | Effects of vertical confinement on gelation and sedimentation of colloids |
| title_full_unstemmed | Effects of vertical confinement on gelation and sedimentation of colloids |
| title_short | Effects of vertical confinement on gelation and sedimentation of colloids |
| title_sort | effects of vertical confinement on gelation and sedimentation of colloids |
| topic | QC Physics QD Chemistry |
| url | http://irep.iium.edu.my/70400/ http://irep.iium.edu.my/70400/ http://irep.iium.edu.my/70400/1/confine_gel_sedim_razali.pdf http://irep.iium.edu.my/70400/7/70400%20Effects%20of%20vertical%20confinement%20on%20gelation%20SCOPUS.pdf |