Solute Transfer between Microemulsion Droplets Composed of Sodium Dioleylphosphate and Sodium Bis(2-ethylhexyl) Sulfosuccinate Mixture

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We have already reported that the microemulsion system composed of sodium dioleylphosphate (SDOLP) and sodium bis(2-ethylhexyl) sulfosuccinate mixtures has peculiar dynamic properties, i.e., slow solute-exchange between the bulk aqueous phase and microemulsion droplets with increasing SDOLP content in total surfactants, and fast exchange between microemulsion droplets. In this work, as a supplement to that report, we present the full data concerned with the interdroplet solute-exchange process with the aid of time-resolved fluorescence. The specific rate of the interdroplet quencher-exchange is 108 dm3mol–1s–1 in order of magnitude, and is insensitive to the SDOLP-content. The quenching process between the fluorescence probe and the quencher in a droplet was markedly decreased with increasing SDOLP-content. The droplet concentration determined from this quenching process approximately agrees with those evaluated from a geometric model.
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