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Dielectric spectroscopy of co-ion effects on microemulsion dynamics and phase behavior

Wachter, Wolfgang ; Buchner, Richard


The effect of added cationic co-ions (Li+, Na+, Cs+, (CH3)4N+) on the dielec. spectra of didodecyldimethylammonium bromide / water / n-dodecane microemulsions is reported. At high water/surfactant mole ratios (W ≈ 100-120) small amts. of co-ions drastically change the shape of the dielec. spectra in the 5-500 MHz region whereas for W ≈ 20 almost no effect is obsd. It is shown that the ...


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