Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/4434

TitleTransitions in ternary surfactant-alkane-water microemulsions as viewed by fluorescence
Author(s)Hungerford, Graham
Real Oliveira, M. Elisabete C.D.
Castanheira, Elisabete M. S.
Burrows, H. D.
Miguel, M. da Graça
KeywordsAnisotropy
C12E5
Fluorescence
Pyrene
Rhodamine 6G
C E Fluorescence 12 5
Issue date2004
PublisherSpringer Verlag
JournalProgress in Colloid and Polymer Science
Citation"Progress in Colloid and Polymer Science". ISSN 0340-255X. 123 (2004) 1-4.
Abstract(s)Fluorescent probes incorporated in ternary surfactant systems have proved valuable in elucidating structure, dynamics and phase behaviour. The intriguing case of microemulsions using non-ionic surfactants, such as alkyloligoethylene oxides, can form phases simultaneously bicontinuous in oil and water. Fluorescence analysis provides both sensitivity and selectivity to monitor these systems. We have used pyrene and rhodamine 6G as probes to enrich our knowledge of the C12E5/alkane/water system, with particular relevance to the bicontinuous phase. Pyrene has been used as a dynamic probe, studying both excimer formation and quenching by molecular oxygen. This provides a useful tool to monitor transitions between microemulsion phases. Both steady state and time-resolved fluorescence measurements indicate a change in localisation on passing from one phase to another. Information was also obtained on microviscosities in these systems using fluorescence depolarisation making use of the well-known laser dye rhodamine 6G. Comparison of the fluorescence characteristics of these systems provides a means to monitor at the microscopic level changes in phase behaviour.
TypeConference paper
URIhttp://hdl.handle.net/1822/4434
ISBN3540005536
DOI10.1007/b11608
ISSN0340-255X
Publisher versionwww.springerlink.com
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CDF - FAMO - Artigos/Papers (with refereeing)

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