| EPSRC Reference: |
EP/G043078/1 |
| Title: |
Measurement of the rate of transfer of a probe molecule through a surfactant layer at the water:oil interface using TF-MuSR |
| Principal Investigator: |
Jayasooriya, Dr UA |
| Other Investigators: |
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| Researcher Co-Investigators: |
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| Project Partners: |
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| Department: |
Chemistry |
| Organisation: |
University of East Anglia |
| Scheme: |
Overseas Travel Grants (OTGS) |
| Starts: |
20 October 2008 |
Ends: |
19 February 2010 |
Value (£): |
25,562
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| EPSRC Research Topic Classifications: |
| Analytical Science |
Complex fluids & soft solids |
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| EPSRC Industrial Sector Classifications: |
| Healthcare |
Pharmaceuticals and Biotechnology |
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| Panel History: |
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Summary on Grant Application Form |
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Molecular transfer across interfacial layers is a rapid process that cannot generally be measured by laboratory-based fast reaction techniques (stopped flow, temperature-jump). To date experimental techniques have largely been based around slow mass transfer measurements using diffusion cells. The approach here does not exclusively quantify the interfacial transfer but measures rates that include transfer through diffusion layers close to the interface [Steytler, D. C.; Towey, T. F.; Robinson, B. H.; Atay, N. Z., Mechanisms of solute interfacial transfer in Winsor-II systems. Langmuir 2001, 17, (2), 417-426.]. With judicial choice of system and probe molecules , TF-MuSR offers a unique opportunity to directly probe interfacial transfer dynamics and energetics. By choosing a suitable probe (muon capture) molecule that exhibits balanced partitioning between oil and water, a dispersed oil:water system can be used with a spin-quencher in one of the liquid phases. The muon-electron hyperfine interaction can then be monitored for which the width of the signal gives the probe lifetime for crossing the interface. Combined with temperature variation, energetic parameters can also be extracted using this approach. To provide the large interfacial area, we propose to employ a well characterised water-in-oil (w/o) micro-emulsion stabilised by bis(2-ethyl hexyl) sodium sulphosuccinate (Aerosol OT) [2]. The system comprises thermodynamically stable nanodroplets of water-in-oil for which the droplet size can be controlled through the water-to-surfactant molar ratio (w)
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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 |
| Summary |
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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.uea.ac.uk |