Phase behaviors of AOT/longer chain n-alkanes reverse micelles in the presence of compressed ethylene

摘要

It was found that,in a suitable pressure range,ethylene could increase the amount of solubilized water in reverse micelles of sodium bis-2-ethylhexylsulfosuccinate (AOT) in longer chain n-alkanes considerably,where the phase separation was induced by a micelle-micelle interaction mechanism.The microenvironments in the ethylene-stabilized reverse micelles were investigated by the UV-vis adsorption spectra using methyl orange (MO) as a probe.The maximum absorption of MO decreased with the increase of ethylene pressure at constant W_0 value.Conductivity measurements demonstrated that the percolation temperature of the reverse micellar system increased considerably after compressed ethylene was added.The results of this work confirm that some small-molecule gases have the function of cosurfactants to stabilize reverse micelles.