Yielding and fracturing of concentrated emulsions in narrow gaps
We used rheology and confocal microscopy techniques to characterise the flow of emulsions as the droplets were confined by increasing the drop volume fraction and reducing the distance between the shearing surfaces. Slip was minimised by matching the density of the oil and water phases. Attractive i...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
RSC Publishing
2013
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| Online Access: | http://hdl.handle.net/20.500.11937/54608 |
| _version_ | 1848759415327424512 |
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| author | Whitby, C. McVicker, R. Connor, J. Sedev, Rossen |
| author_facet | Whitby, C. McVicker, R. Connor, J. Sedev, Rossen |
| author_sort | Whitby, C. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | We used rheology and confocal microscopy techniques to characterise the flow of emulsions as the droplets were confined by increasing the drop volume fraction and reducing the distance between the shearing surfaces. Slip was minimised by matching the density of the oil and water phases. Attractive interactions between the drops caused them to flocculate. The contribution of the emulsion microstructure to its shear response becomes significant when the oil drop flocs almost span the distance between the surfaces. We found that confining the flow of droplet flocs causes a transition from a fluid phase with shear thinning flow behaviour into a jammed, solid-like material. The large deformations caused by flow at the maximum drop packing fraction induce droplet coalescence within highly localised regions of the emulsion. |
| first_indexed | 2025-11-14T09:59:31Z |
| format | Journal Article |
| id | curtin-20.500.11937-54608 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:59:31Z |
| publishDate | 2013 |
| publisher | RSC Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-546082017-11-03T00:46:32Z Yielding and fracturing of concentrated emulsions in narrow gaps Whitby, C. McVicker, R. Connor, J. Sedev, Rossen We used rheology and confocal microscopy techniques to characterise the flow of emulsions as the droplets were confined by increasing the drop volume fraction and reducing the distance between the shearing surfaces. Slip was minimised by matching the density of the oil and water phases. Attractive interactions between the drops caused them to flocculate. The contribution of the emulsion microstructure to its shear response becomes significant when the oil drop flocs almost span the distance between the surfaces. We found that confining the flow of droplet flocs causes a transition from a fluid phase with shear thinning flow behaviour into a jammed, solid-like material. The large deformations caused by flow at the maximum drop packing fraction induce droplet coalescence within highly localised regions of the emulsion. 2013 Journal Article http://hdl.handle.net/20.500.11937/54608 10.1039/c3sm50314c RSC Publishing restricted |
| spellingShingle | Whitby, C. McVicker, R. Connor, J. Sedev, Rossen Yielding and fracturing of concentrated emulsions in narrow gaps |
| title | Yielding and fracturing of concentrated emulsions in narrow gaps |
| title_full | Yielding and fracturing of concentrated emulsions in narrow gaps |
| title_fullStr | Yielding and fracturing of concentrated emulsions in narrow gaps |
| title_full_unstemmed | Yielding and fracturing of concentrated emulsions in narrow gaps |
| title_short | Yielding and fracturing of concentrated emulsions in narrow gaps |
| title_sort | yielding and fracturing of concentrated emulsions in narrow gaps |
| url | http://hdl.handle.net/20.500.11937/54608 |