Aging mechanisms of perfluorocarbon emulsions using image analysis

The aging mechanisms of perfluorocarbon emulsions were investigated using image analysis. Oil-in-water emulsions of two perfluorocarbons, n-perfluorohexane and perfluorodecalin, were prepared with three emulsifiers, Lecithin, Span 20, and Pluronic F-68. The effect of the temperature and the replacem...

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Bibliographic Details
Published in:Journal of colloid and interface science 2005-06, Vol.286 (1), p.224-232
Main Authors: Freire, Mara G., Dias, Ana M.A., Coelho, Maria A.Z., Coutinho, João A.P., Marrucho, Isabel M.
Format: Article
Language:English
Subjects:
Chemistry
Coalescence
Colloidal state and disperse state
Emulsifying Agents - chemistry
Emulsion stability
Emulsions
Emulsions. Microemulsions. Foams
Exact sciences and technology
Fluorocarbons - chemistry
General and physical chemistry
Image analysis
Molecular diffusion
n-Perfluorohexane
Ostwald ripening
Perfluorodecalin
Phase Transition
Surface Properties
Temperature
Time Factors
Water - chemistry
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Summary:The aging mechanisms of perfluorocarbon emulsions were investigated using image analysis. Oil-in-water emulsions of two perfluorocarbons, n-perfluorohexane and perfluorodecalin, were prepared with three emulsifiers, Lecithin, Span 20, and Pluronic F-68. The effect of the temperature and the replacement of water by an aqueous phase consisting of a microbial culture medium were also studied. The emulsions were prepared by sonication and their stability was followed through analysis of the evolution of mean droplet size. The results indicate that the stability of perfluorocarbon in water emulsions depends on all the parameters investigated and that two aging mechanisms, coalescence and molecular diffusion, may take place. Analysis of the evolution of the mean droplet size during long time periods indicate that coalescence is more common than previously reported for these systems and seems to be favored by a temperature increase.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2004.12.036