%0 Journal Article %A Liu, Doudou %A Du, Changfei %A Chen, Zhiyun %A Wang, Xue %A Shen, Weiguo %D 2019 %T The stability boundaries of droplets of water/AOT/Dynol-604/isooctane mixed microemulsions %U https://tandf.figshare.com/articles/journal_contribution/The_stability_boundaries_of_droplets_of_water_AOT_Dynol-604_isooctane_mixed_microemulsions/9532691 %R 10.6084/m9.figshare.9532691.v1 %2 https://tandf.figshare.com/ndownloader/files/17161580 %K Density %K microemulsion %K volumetric property %K inter-droplet interaction %K stability boundary %X

In this study, we investigated the volumetric properties of water/sodium 1,4-bis(2-ethylhexyl)sulfosuccinate(AOT)/ethoxylated-2,5,8,11-tetramethyl-6-dodecyne-5,8-diol(Dynol-604)/isooctane mixed microemulsions by density measurement at T = 303.15 K. It was observed that the volumetric interaction between the microemulsion droplets decreased with the increase of the content of Dynol-604 due to the reduction of electrostatic repulsion between the AOT head groups. The volumetric properties were analyzed by a proposed thermodynamic model to obtain the critical microemulsion concentrations and the maximum molar ratios ω d,max of water to surfactants, which are the stable boundaries of the microemulsion droplets to accommodate the maximal content of water in their cores. It was found that ω d,max increased from 62 to 77 as the mole fraction of Dynol-604 in mixed surfactants varied from 0 to 0.5. This result is further confirmed by conductivity measurements.

%I Taylor & Francis