Journal
SOFT MATTER
Volume 15, Issue 27, Pages 5529-5536Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sm00891h
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Funding
- Key Project of the National Natural Science Foundation of China [U1762106]
- Natural Science Foundation of Shandong Province [ZR2019MEE077]
- Fundamental Research Funds for the Central Universities [19CX02064A]
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Additional HCl can facilely control the dynamic noncovalent interaction between anionic surfactant sodium dodecyl benzene sulfonate (SDBS) and additional organic matter, 4,4'-oxydianiline (ODA), at the water/oil interface. At low HCl concentration (ODA/HCl molar ratio (r) = 1 : 1.5, [ODA] = 250 mg L-1), the ODA(+) ions effectively enhanced the SDBS ability to reduce the water/oil interfacial tension (IFT) by about two orders of magnitude, while the (SDBS)(2)/ODA(2+) gemini-like surfactants could be constructed at a relatively high HCl concentration (r = 1 : 4, [ODA] = 250 mg L-1), which could largely reduce the IFT to 1.19 x 10(-3) mN m(-1). Molecular simulation was employed to explore the interfacial activity of ODA(n+) (ODA(+)/ODA(2+)) ions and the SDBS/ODA(n+) interaction. The control experiments used another three surfactants to verify the proposed model. The pH-switchable gradual protonation of amino groups in ODA molecules determined the SDBS/ODA interfacial assembly, which was responsible for the reversal of IFT variations and the related emulsion behaviors.
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