Mixed micelle formation in two-phase systems

Harusawa, Fuminori; Tanaka, Muneo

doi:10.1021/j150607a029

Cited by 32 publications

(23 citation statements)

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“…This has been discussed in detail elsewhere [3][4][5], and only a simplified treatment is presented here.…”

Section: The Pseudophase Model To Represent the Interfacial Surfactanmentioning

confidence: 99%

“…All commercial ethoxylated nonionic surfactants exhibit a distribution in ethylene oxide number (EON), and thus include species which are quite different from one another as far as their affinity for oil and water is concerned. This complex case has been studied in detail in the past two decades by using the pseudophase model [3,4] to carry out an analysis of the partitioning between the excess phases of a Winsor III system [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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The selective partitioning of the oligomers of polyethoxylated surfactant mixtures between interface and oil and water bulk phases

Graciaa

Andérez

Bracho

et al. 2006

Advances in Colloid and Interface Science

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“…This has been discussed in detail elsewhere [3][4][5], and only a simplified treatment is presented here.…”

Section: The Pseudophase Model To Represent the Interfacial Surfactanmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The selective partitioning of the oligomers of polyethoxylated surfactant mixtures between interface and oil and water bulk phases

Graciaa

Andérez

Bracho

et al. 2006

Advances in Colloid and Interface Science

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“…Ideal mixing models have also been generalized for treating multicomponent surfactant mixtures with an arbitrary number of components (20,93,94). Treatment of multicomponent ideal mixtures has also been extended to two phase systems which contain an oil phase in addition to the surfactant solution (93,95).…”

Section: Modeling Mixed Micellar Systemsmentioning

confidence: 99%

“…Treatment of multicomponent ideal mixtures has also been extended to two phase systems which contain an oil phase in addition to the surfactant solution (93,95).…”

Section: Modeling Mixed Micellar Systemsmentioning

confidence: 99%

Mixed Surfactant Systems

Holland¹,

Rubingh

1992

Mixed Surfactant Systems

254

329

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The properties and behavior of mixed surfactant systems are discussed in the context of experimental techniques and modeling. The overview begins with a general description of mixed surfactant solutions, followed by a more detailed examination of mixed micelles, surfactant mixtures at interfaces, and the phase behavior of mixed systems. Topics include experimental measurements, approaches to modeling, nonideality, unusual surfactant types, micellar demixing, adsorption at various interfaces, chemical reactions in micelles, precipitation, cloud point phenomena and perspectives on the direction of future research on mixed surfactant systems.Mixed surfactant systems are encountered in nearly all practical applications of surfactants. These mixtures arise from several sources. First is the natural polydispersity of commercial surfactants which results from impurities in starting materials and variability in reaction products during their manufacture. These are less expensive to produce than isomerically pure surfactants and often provide better performance. Second is the deliberate formulation of mixtures of different surfactant types to exploit synergistic behavior in mixed systems or to provide qualitatively different types of performance in a single formulation (e.g. cleaning plus fabric softening). Finally, practical formulations often require the addition of surfactant additives to help control the physical properties of the product or improve its stability.

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“…29,51 However, the relative hydrophobicity/hydrophilicity in one-phase system, such as in water phase, may or may not be the same as that in a two-phase system, such as in the water-oil phases for one particular surfactant relative the other. The hydrophobicity/hydrophilicity of surfactant can usually be reflected by the value of the cmc in the environment discussed.…”

Section: Resultsmentioning

confidence: 99%

Experimental Investigation and Modeling of the Performance of Pure and Mixed Surfactant Inhibitors: Partitioning and Distribution in Water-Oil Environments

Zhu

Free

2015

J. Electrochem. Soc.

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A critical model of water-oil surfactant distribution has been developed and validated for the evaluation of mixed surfactant partitioning and distribution in water-oil environments. The surfactant distribution model, which is a combination of surfactant partitioning sub-model, partitioning coefficient calculation method, and a developed critical micelle concentration (cmc) prediction sub-model based on previous work, provides a very powerful tool to evaluate the partitioning of mixed surfactants in water-oil environments. Different methods to calculate partitioning coefficients are introduced, which includes transfer free energy method and group contribution method. The partitioning data from model prediction and from experiment agree very well. The mixed micelles start to form in water-oil environments only after the apparent cmc is reached during partitioning. The selective partitioning of one particular surfactant in mixed surfactants can be explained by its apparent cmc which is interpreted as one characteristic of the hydrophobicity/hydrophilicity of that surfactant in water-oil environments. It is believed that the partitioning and distribution of non-homologous mixed surfactants in oil-water environments are evaluated theoretically and experimentally for the first time. The effect of partitioning on corrosion inhibition of mixed surfactants was initially evaluated by modified Langmuir adsorption and by electrochemical measurements. The corrosion inhibition efficiency from model prediction and from experimental measurements is comparable. The use of surfactant inhibitors has received extensive attention in the oil and gas industry for corrosion inhibition of production and transportation pipes (metallic materials, such as steel and copper) in a way that surfactant molecules usually adsorb on steel surface and form a protective film which acts as a barrier to prevent corrosive media penetration and attack. [1][2][3][4] Compared to the production and use of pure surfactants, surfactant mixtures are well known due to the superior physicochemical properties and capabilities in efficient solubilization, adsorption, suspension, and transportation. [5][6][7][8] The solutions of surfactant mixtures can often be conveniently tuned to achieve desired properties by adjusting the mixed surfactant types and molar ratios. More surface-active and expensive surfactants are often mixed with less surface-active and cheaper surfactants to reduce cost.9,10 Natural mixtures of surfactants are sometimes used to avoid the investment in separation processes. However, further studies are required in order to optimize inhibition efficiency of surfactant mixtures and minimize environmental impact.Surfactant molecules have hydrophilic and hydrophobic sections, 7,11,12 which are critical to the adsorption on metal surface and associated corrosion inhibition.2-4 The hydrophilic functional group of surfactant molecules strongly prefers interaction with polar entities such as metals, which is helpful in corrosion inhibition. The hydroph...

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Mixed micelle formation in two-phase systems

Cited by 32 publications

References 1 publication

The selective partitioning of the oligomers of polyethoxylated surfactant mixtures between interface and oil and water bulk phases

The selective partitioning of the oligomers of polyethoxylated surfactant mixtures between interface and oil and water bulk phases

Mixed Surfactant Systems

Experimental Investigation and Modeling of the Performance of Pure and Mixed Surfactant Inhibitors: Partitioning and Distribution in Water-Oil Environments

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