| EPSRC Reference: |
GR/M06239/01 |
| Title: |
YIELDING, FLOW AND AGEING OF TEXTURED SOFT MATERIALS |
| Principal Investigator: |
Pusey, Professor P |
| Other Investigators: |
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| Researcher Co-Investigators: |
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| Project Partners: |
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| Department: |
Sch of Physics and Astronomy |
| Organisation: |
University of Edinburgh |
| Scheme: |
Standard Research (Pre-FEC) |
| Starts: |
01 January 1999 |
Ends: |
31 December 2001 |
Value (£): |
197,740
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| EPSRC Research Topic Classifications: |
| Complex fluids & soft solids |
Rheology |
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Summary on Grant Application Form |
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We request funding to study the yielding and ageing of a wide range of soft solids under (oscillatory) shear using a new method, diffusing-wave spectroscopy (DWS) echo. In this method, the degree of irreversible rearrangement a material suffers when stressed (i.e. the amount of plastic rather than elastic strain) is monitored precisely by correlating the intensity of light scattered before and after cycles of deformation in a purpose-built precision shear cell. We also proposed an extension of the method: by varying the degree of refractive-index matching and thus the scattering power of the sample, the spatial scale over which rearrangements are probed can be tuned. Materials to be investigated may include colloidal glasses and gels (dense and ramified amorphous packing of particles), and dense packings of viscoelastic particles (such as multilamellar surfactant vesicles, or onions ). Data obtained from other techniques, such as conventional and two-colour light scattering, rheology and microscopy, will be employed to complement the microdynamical information derived from DWS echo. This project should give improved understanding of the mechanisms of slow structural changes in a range of textured metastable states (soft solids), and therefore better prediction and control of shelf life in a range of industrial products.
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Key Findings |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Potential use in non-academic contexts |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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Impacts |
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| Description |
This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk |
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| Date Materialised |
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Sectors submitted by the Researcher |
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This information can now be found on Gateway to Research (GtR) http://gtr.rcuk.ac.uk
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| Project URL: |
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| Further Information: |
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| Organisation Website: |
http://www.ed.ac.uk |