Abstract
Addition of the crown-ethers 15-crown-5 (CE5) and 18-crown-6 (CE6) to Aerosol OT (AOT)-stabilized w/o microemulsion leads to drastic rheological changes. A mixture of 20 wt% solution of a CE in water with an oil stock solution of AOT is biphasic but can be transformed into a homogeneous, transparent, viscoelastic solution by simple shaking. This gelly phase demixes again after hours up to several days. In addition, anomalous percolation properties are found for mixtures containing small amount of CE. Both effects are interpreted taking into account the complexing ability of the CEs with respect to the sodium counterion of AOT.
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