Influence of dialkyl chains of sulfosuccinate sodium salt surfactant on interfacial tension between hydrophobic material and water

• Published in: Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2024-01, Vol.681, p.132770, Article 132770
• Main Authors: Okamura, Satoru, Aono, Keita, Yokoyama, Minoru, Shiba, Hiroya, Suzuki, Furitsu, Okano, Tetsuya, Iimura, Ken-ichi
• Format: Article
• Language: English
• Subjects: Detachment; Dialkyl sulfosuccinate sodium salt; Interfacial tension; Oily soil; Spreading coefficient
• ISSN: 0927-7757; 1873-4359
• DOI: 10.1016/j.colsurfa.2023.132770

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. [Display omitted] •Interfacial tensions were estimated for systems of hydrophobic solid, triolein, and aqueous surfactant solutions.•Dialkyl sulfosuccinate surfactants largely decreased the hydrophobic solid-water and -oil interfacial tensions.•AOT effectively induced detachment of triolein droplet from the hydrophobic solid surface in water.•Interfacial phenomena are interpreted in terms of interfacial tensions and molecular structure and packing at interfaces.