Abstract
We investigated the interfacial tension between a hydrophobic solid and aqueous solutions of bis(2-ethylhexyl) sulfosuccinate sodium salt (AOT), its analogues with different hydrophobic chains, and sodium dodecyl sulfate (SDS). The hydrophobic solid surface was prepared through chemisorption by n-octadecanthiol on an Au film on glass slide. As the hydrophobic oil, triolein was used. It was shown that sulfosuccinate surfactants largely decreased the interfacial tension between the hydrophobic solid and the aqueous solutions compared to SDS. Furthermore, it was observed that a 20 mM AOT aqueous solution induced spontaneous detachment of a triolein droplet from the hydrophobic solid surface in water. This concentration of AOT solution for the detachment was consistent with that expected through the calculation of the spreading coefficient.
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