Abstract
A series of anionic gemini surfactants have been synthesized. The surface properties and micellization process of as-prepared sulfonate gemini surfactants (SGS) and carboxylate gemini surfactant (CGS) have been studied by surface tension measurement and isothermal titration microcalorimetry. Meanwhile, the interaction of these five surfactants with polyacrylamide (PAM) was investigated using surface tension, steady-state fluorescence measurement, and isothermal titration microcalorimetry. The results show that the critical micelle concentrations (CMCs) of above-mentioned surfactants are more than 1 order of magnitude lower than those of corresponding single chain surfactants. Moreover, the enthalpy of micelle formation (ΔH mic) for the investigated gemini surfactants is negative. In the surfactant–PAM systems, the thermodynamic parameters of binding have also been determined. The conclusion may be drawn that the binding strength of SGS onto PAM is stronger than that of CGS, resulting from more compact structure of SGS aggregates. With increasing surfactant hydrophobicity, the values of ΔH agg become more exothermic and a ΔS agg decrease was observed. Therefore, the interaction between SGS and PAM is enthalpy-driven.
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Abbreviations
- SGS:
-
Sulfonate gemini surfactant
- CGS:
-
Carboxylate gemini surfactant
- CMC:
-
Critical micelle concentration
- CAC:
-
Critical aggregation concentration
- PAM:
-
Polyacrylamide
- ITC:
-
Isothermal titration microcalorimetry
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Acknowledgments
The authors gratefully acknowledge the financial support from PetroChina Innovation Foundation (Grant No. 2011D-5006-0211), Educational Commission of Hubei Province of China (Grant No. Q20141302), National Science Fund for Distinguished Young Scholars of China (Grant No. 21225313).
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Lai, L., Mei, P., Wu, XM. et al. Micellization of anionic gemini surfactants and their interaction with polyacrylamide. Colloid Polym Sci 292, 2821–2830 (2014). https://doi.org/10.1007/s00396-014-3304-y
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DOI: https://doi.org/10.1007/s00396-014-3304-y