Abstract
The rate constant k{sub e} associated with the exchange of material upon collisions between droplets in ternary water in oil microemulsions stabilized by ionic surfactants has been determined by a time-resolved fluorescence method. The electrical conductivity of the same systems has been investigated. It appears that percolative conduction occurs only in systems where k{sub e} is larger than (1-2) {times} 10{sup 9} M{sup {minus}1} s{sup {minus}1}. This result supports the hypothesis that above percolation threshold the conductivity is mainly due to the motion of counterions through water channels or fusion between droplets in droplet clusters.
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