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Ethoxylated alkylphenol surfactants fractionation between oil and water is best studied in three-phase so-called optimum formulation systems, in which a microemulsion is in equilibrium with both oil and water excess phases. The partitioning is found to be slightly affected by the structure of the surfactant hydrophobe. It is found that the more the branching the more the surfactant tends to partition...
In classical foam stability studies, foam height variation is monitored versus time. The decay pattern depends, however, upon the foam structure at the start of the decay; in many instances this structure changes significantly during the first few minutes, and it is difficult to select a proper zero time of decay. We have found that the decay behavior is very well defined when the original state...
Ethoxylated alkyl phenol oligomer partitioning between the microemulsion-water-oil (heptane) phases of a Winsor III system is determined by high performance liquid chromatography for systems containing octyl, nonyl, decyl, dodecyl and dinonyl phenol species. The partition coefficient between the water and oil phases obeys a simple law depending upon the alkyl chain length and the number of ethylene...
Starting with previous results showing that the solubilization of oil and water in a microemulsion can be improved by the introduction of an additive, i.e. a so-called lipophilic linker, a new surfactant type that mimics the additive effect is tested. The so-called extended surfactant has a poly-propylene oxide chain inserted in between the conventional alkyl and ether sulfate groups. These surfactants...
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