Switching electrical conductivity in an AOT–isooctane–water microemulsion through photodimerization of solubilized N-methyl-2-quinolone

Literature Information

Publication Date 2006-08-07
DOI 10.1039/B606888J
Impact Factor 3.676
Authors

Markus Bufe, Thomas Wolff


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Abstract

The electrical conductivity of microemulsions composed of Aerosol OT (AOT), isooctane and water as a function of temperature was studied in the absence and presence of N-methyl-2-quinolone (NMQ), and consequences of an in situ photodimerization of NMQ were investigated. A conductivity increase upon raising the temperature of a water-in-oil microemulsion indicates percolation. Percolation temperatures (Tp) can be influenced specifically by the addition of certain substances. Small amounts of solubilized N-methyl-2-quinolone induce lower Tp (by up to 9 K), and photodimerization of NMQ shifts Tp back to higher values. Consequently, the microemulsion can be switched from conducting to non-conducting without varying temperature or composition by exposing samples to UV light at λ > 310 nm. The effect can be reverted in part by irradiation at λ = 250 nm. Coumarin derivatives—structurally related to NMQ—show much slighter effects.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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