Influence of polyethylene glycols on percolative phenomena in AOT microemulsions |
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Authors: | Serxio I Arias-Barros Antonio Cid Luis García-Río Juan C Mejuto Jorge Morales |
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Institution: | 1. Departamento de Química Física, Facultade de Ciencias, Universidade de Vigo, 32004, Ourense, Spain 2. Departamento de Química Física, Facultade de Química, Universidade de Santiago de Compostela, 15782, Santiago de Compostela, Spain
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Abstract: | The influence of different polyethylene glycol (PEG) on the percolation of the ternary system composed by sodium bis(2-ethylhexyl)
sulfosuccinate (AOT) + isooctane + water has been studied. The additives used were chosen on the basis of its chain length
(the number of polymeric units). In all cases, we observed a decrease in the percolation threshold on increasing the amount
of PEG added to the AOT microemulsions. We observed a correlation between the effect exerted by the additive upon the percolation
temperature and its chain length. Moreover, a relationship between the percolation temperature and the additive partition
coefficient between 1-octanol and water (logP) was found. Both of them proved the importance of the inclusion of the additives into the microemulsion interface to explain
their influence upon the percolative phenomenon. Such inclusion modified the properties of the AOT film, facilitating the
exchange of matter between droplets. |
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Keywords: | |
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