Microemulsion phase behavior of anionic‐cationic surfactant mixtures: Effect of tail branching

Upadhyaya, Ashraya; Acosta, Edgar; Sabatini, David A.

doi:10.1007/s11743-006-0387-6

Cited by 54 publications

(50 citation statements)

References 43 publications

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“…the linear-linear SDSDPCl system). These results are consistent with the expectation that surfactant tail asymmetry and branching will reduce the head-head interactions between anionic and cationic surfactants and thus the tendency of the mixed surfactant system to form structured precipitate phases [47].…”

Section: Precipitation Studiessupporting

confidence: 91%

Adsorption of Anionic–Cationic Surfactant Mixtures on Metal oxide Surfaces

Upadhyaya¹,

Acosta

Scamehorn

et al. 2007

J Surfact & Detergents

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This research evaluates the adsorption of anionic and cationic surfactant mixtures on charged metal oxide surfaces (i.e., alumina and silica). For an anionic-rich surfactant mixture below the CMC, the adsorption of anionic surfactant was found to substantially increase with the addition of low mole fractions of cationic surfactant. Two anionic surfactants (sodium dodecyl sulfate and sodium dihexyl sulfosuccinate) and two cationic surfactants (dodecyl pyridinium chloride and benzethonium chloride) were studied to evaluate the effect of surfactant tail branching. While cationic surfactants were observed to co-adsorb with anionic surfactants onto positively charged surfaces, the plateau level of anionic surfactant adsorption (i.e., at or above the CMC) did not change significantly for anionic-cationic surfactant mixtures. At the same time, the adsorption of anionic surfactants onto alumina was dramatically reduced when present in cationic-rich micelles and the adsorption of cationic surfactants on silica was substantially reduced in the presence of anionic-rich micelles. This demonstrates that mixed micelle formation can effectively reduce the activity of the highly adsorbing surfactant and thus inhibit the adsorption of the surfactant, especially when the highly adsorbing surfactant is present at a low mole fraction in the mixed surfactant system. Thus surfactant adsorption can be either enhanced or inhibited using mixed anionic-cationic surfactant systems by varying the concentration and composition.

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Section: Precipitation Studiessupporting

confidence: 91%

Adsorption of Anionic–Cationic Surfactant Mixtures on Metal oxide Surfaces

Upadhyaya¹,

Acosta

Scamehorn

et al. 2007

J Surfact & Detergents

Self Cite

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“…The synergisms of mixtures of anionic-cationic surfactant systems can be used to form middle-phase microemulsions without adding short-chain alcohols [109,110]. The surfactants studied were sodium dihexyl sulphosuccinate and benzethonium chloride.…”

Section: Dry Cleaningmentioning

confidence: 99%

“…Under optimum middle-phase microemulsion conditions, mixed anionic-cationic surfactant systems solubilised more oil than the anionic surfactant alone. Upadhyaya et al [109] proposed a model for the interaction of branched-tail surfactants (Fig. 8.16).…”

Section: Dry Cleaningmentioning

confidence: 99%

Microemulsions in Cosmetics and Detergents

2009

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Products for personal care and home care have to fulfil many different requirements regarding performance, aesthetics, costs and safety. This has consequences for the use of new technologies such as microemulsions for this kind of applications. If, for example, just one of these parameters (e.g. performance) is sufficient or even excellent while the other parameters do not meet the requirements, then the new technology will not be applied. This example reflects the challenges of applying microemulsions in cosmetic products and in detergency. Although there have been numerous basic studies with microemulsions which show superiority in certain aspects of performance, broad applications of microemulsions in detergency and cosmetic products are not yet achieved. The reasons for this are manifold and depend on the specific application. From an economical point of view the high surfactant concentration is one aspect. However, the fact that the formation of a microemulsion depends on various parameters such as the type of oil, the chosen surfactant, the temperature and the electrolyte content to mention just a few is even more important.As discussed in Chapters 1 and 3 of this book, the formation of microemulsions can be controlled by adjusting the temperature, the electrolyte content or the hydrophiliclipophilic balance by varying the ratio of different surface active agents. All these techniques are applicable in cosmetics and detergency and have specific advantages and disadvantages. For example, most consumer products require a temperature stability which is usually not achieved with temperature-induced microemulsions. Therefore, no general rule exists for the most suitable type of microemulsion but it depends on the application. In this chapter, several examples are given which describe the status of different applications in cosmetics and detergency. Microemulsions in cosmeticsMicroemulsions are used in many cosmetic products and are in the focus of current industrial and university research activities. The reasons and motivations are manifold. The following is a summary of their utilisation in several cosmetic product categories with many references to publications and patents. Common aspects of microemulsions Microemulsions: Background, New Concepts, Applications, Perspectives. Edited by Cosima Stubenrauch

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“…Mixtures of anionic and cationic surfactants have been widely used in detergency and fabric softening, analytical chemistry, enhanced oil recovery, and pharmaceutical applications [1][2][3][4][5][6][7]. Mixtures of anionic and cationic surfactants can exhibit greater synergism than other mixed systems (anionic-anionic, cationic-cationic, ionic-nonionic, and nonionic-nonionic): they have the potential for much lower critical micelle concentration (CMC) than either of the anionic and cationic surfactant components [2][3][4][5][6][7]; they are usually more surface active (low interfacial tension, IFT) than individual surfactants; and they can also produce microstructures not formed by pure components D such as vesicles and rod-like micelles [7].…”

Section: Introductionmentioning

confidence: 99%

Precipitation and Micellar Properties of Novel Mixed Anionic Extended Surfactants and a Cationic Surfactant

Panswad

Sabatini

Khaodhiar

2011

J Surfact & Detergents

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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 b 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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Microemulsion phase behavior of anionic‐cationic surfactant mixtures: Effect of tail branching

Cited by 54 publications

References 43 publications

Adsorption of Anionic–Cationic Surfactant Mixtures on Metal oxide Surfaces

Adsorption of Anionic–Cationic Surfactant Mixtures on Metal oxide Surfaces

Microemulsions in Cosmetics and Detergents

Precipitation and Micellar Properties of Novel Mixed Anionic Extended Surfactants and a Cationic Surfactant

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