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Dong AW, Pascual-Izarra C, Pas SJ, Hill AJ, Boyd BJ, Drummond CJ. Positron Annihilation Lifetime Spectroscopy (PALS) as a Characterization Technique for Nanostructured Self-Assembled Amphiphile Systems. J Phys Chem B 2008; 113:84-91. [DOI: 10.1021/jp805280r] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Aurelia W. Dong
- CSIRO Molecular and Health Technologies, Private Bag 10, Clayton, VIC 3169, Australia; Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia; ARC Centre of Excellence for Electromaterials Science, Department of Materials Engineering, Monash University, Clayton VIC 3800, Australia; and CSIRO Materials Science and Engineering, Private Bag 33, Clayton, VIC 3169, Australia
| | - Carlos Pascual-Izarra
- CSIRO Molecular and Health Technologies, Private Bag 10, Clayton, VIC 3169, Australia; Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia; ARC Centre of Excellence for Electromaterials Science, Department of Materials Engineering, Monash University, Clayton VIC 3800, Australia; and CSIRO Materials Science and Engineering, Private Bag 33, Clayton, VIC 3169, Australia
| | - Steven J. Pas
- CSIRO Molecular and Health Technologies, Private Bag 10, Clayton, VIC 3169, Australia; Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia; ARC Centre of Excellence for Electromaterials Science, Department of Materials Engineering, Monash University, Clayton VIC 3800, Australia; and CSIRO Materials Science and Engineering, Private Bag 33, Clayton, VIC 3169, Australia
| | - Anita J. Hill
- CSIRO Molecular and Health Technologies, Private Bag 10, Clayton, VIC 3169, Australia; Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia; ARC Centre of Excellence for Electromaterials Science, Department of Materials Engineering, Monash University, Clayton VIC 3800, Australia; and CSIRO Materials Science and Engineering, Private Bag 33, Clayton, VIC 3169, Australia
| | - Ben J. Boyd
- CSIRO Molecular and Health Technologies, Private Bag 10, Clayton, VIC 3169, Australia; Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia; ARC Centre of Excellence for Electromaterials Science, Department of Materials Engineering, Monash University, Clayton VIC 3800, Australia; and CSIRO Materials Science and Engineering, Private Bag 33, Clayton, VIC 3169, Australia
| | - Calum J. Drummond
- CSIRO Molecular and Health Technologies, Private Bag 10, Clayton, VIC 3169, Australia; Drug Delivery, Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia; ARC Centre of Excellence for Electromaterials Science, Department of Materials Engineering, Monash University, Clayton VIC 3800, Australia; and CSIRO Materials Science and Engineering, Private Bag 33, Clayton, VIC 3169, Australia
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Abstract
Positron annihilation spectroscopy (PAS) has emerged as a powerful technique for investigating structural changes, phase transitions and microenvironmental transformations in a variety of systems. The process of molecular aggregation in micellar systems is known to be cooperative and size limited; it shows features similar to that of a classical phase transition. Similarly, the changes in the concentration of surfactant and the solubilizate bring about several microstructural and conformational transformations in these systems. High sensitivity of positron annihilation parameters to such changes makes it a potential candidate for investigating micellar and microemulsion systems. This paper deals with this aspect of positron annihilation spectroscopy. Applications of this technique to investigate conformational, structural and microenvironmental transformations in micellar and microemulsion systems are discussed. Its superiority over the conventional techniques in such investigations is demonstrated. It is shown that this technique reveals finer details of otherwise considered to be single phase regions in a phase diagram. Its usefulness in delineating phase boundaries and hence in mapping of phase diagrams is also discussed.
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Affiliation(s)
- P C Jain
- Department of Physics and Astrophysics, University of Delhi, India
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