Abstract
Surfactant-modified mineral surfaces can provide both a hydrophobic coating for adsorbing organic contaminants and, in the case of ionic surfactants, a charged exterior for adsorbing oppositely charged species. This research evaluates the precipitation phase boundaries and synergistic behavior of the mixtures of carboxylate-based anionic extended surfactants with a pyridinium-based cationic surfactant. One cationic surfactant (cetylpyridinium chloride) and four anionic extended surfactants were studied. The anionic surfactants studied were ethoxy carboxylate extended surfactants with average carbon chain lengths of either 16 and 17 or 16 and 18 with 4 mol of a propylene oxide group and a different number of moles of an ethylene oxide group (2 and 5 mol). Precipitation phase boundaries of mixed anionic extended surfactants and cationic surfactant were evaluated to ensure that the surface tension studies are in regions without precipitate. Surface tension measurements were conducted to evaluate the critical micelle concentration of individual and mixed surfactant systems. Precipitation phase boundaries of these novel mixed surfactant systems showed greatly reduced precipitation areas as compared to a conventional mixed surfactant system which is attributed to the presence of the ethylene oxide and propylene oxide groups and resulting steric hindrances to precipitation. Moreover, it was demonstrated that the CMC of mixed surfactant systems were much lower than that of individual surfactant systems. Synergism was evaluated in the four systems studied by the β parameter which found that all systems studied exhibited synergism. From these results, these novel mixed surfactant systems can greatly increase formulation space (reduce the precipitation region) while maintaining synergism, although slightly reduced from conventional anionic-cationic mixtures reported previously.
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Acknowledgments
Financial support for this work was provided by the National Center of Excellence for Environmental and Hazardous Waste Management (NCE-EHWM), Chulalongkorn University. Additional funding was provided by the Ratchadaphiseksomphot Endowment Fund in honor of the 90th anniversary of Chulalongkorn University, Chulalongkorn University. Additionally, financial support for this research was received from the industrial sponsors of the Institute for Apply Surfactant Research (IASR), University of Oklahoma, including Akzo Nobel, Clorox, Conoco/Phillips, Church and Dwight, Ecolab, Haliburton, Dow Chemical, Huntsman, Oxiteno, Procter and Gamble, Sasol and Shell. Finally, we thank the Sun Oil Company Chair (D.A. Sabatini) at the University of Oklahoma for supporting funds for this research.
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Panswad, D., Sabatini, D.A. & Khaodhiar, S. Precipitation and Micellar Properties of Novel Mixed Anionic Extended Surfactants and a Cationic Surfactant. J Surfact Deterg 14, 577–583 (2011). https://doi.org/10.1007/s11743-011-1282-3
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DOI: https://doi.org/10.1007/s11743-011-1282-3