Viscosities of anionic—nonionic mixed surfactant systems

Uchiyama, Hirotaka; Abe, Masahiko; Oginö, Kazuhíde

doi:10.1016/0021-9797(90)90180-v

Cited by 19 publications

(7 citation statements)

References 23 publications

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“…The maximum in viscosity arises because of the formation of the mixed micelle as well as because of the electroviscous property. The electroviscous effect of mixed micelles is larger than that of single solution [44]. It should also be noted that at all temperatures the relative viscosity shows positive deviation from linearity indicating mixed micelle formation.…”

Section: Resultsmentioning

confidence: 92%

Physicochemical properties of mixed surfacant systems: sodium dodecyl benzene sulfonate with triton X 100

Saiyad

Bhat

Rakshit

1998

Colloid & Polymer Science

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The physicochemical properties of a mixed surfactant system were studied under various conditions. The surfactants were anionic sodium dodecyl benzene sulfonate and nonionic Triton X 100. Variation of specific conductivity with concentration was used to determine the critical micelle concentration of anionic as well as the mixed surfactants. Iodine solubilization method was used to determine the CMC of the nonionic surfactant. The interaction parameter between the surfactant molecules were calculated.The wetting, foaming and detergent properties of mixed surfactant systems were studied. The variation of contact angle of the solution with teflon surface as a function of surfactant concentration was found to be a reasonably good method to determine the critical micelle concentration. Viscosity and cloud points were also determined. All these quantities are discussed.

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Section: Resultsmentioning

confidence: 92%

Physicochemical properties of mixed surfacant systems: sodium dodecyl benzene sulfonate with triton X 100

Saiyad

Bhat

Rakshit

1998

Colloid & Polymer Science

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“…The shape factor has been calculated for prolate 52 and oblate ellipsoids and is given in Table for each of these shapes. The salt concentration was high enough (0.1 M) that electroviscous effects could be neglected. , …”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Measurement and Prediction of Ionic/Nonionic Mixed Micelle Formation and Growth

1998

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We investigate synergism in mixed micelle formation and growth in two ionic/nonionic surfactant mixtures. In one mixture, the nonionic surfactant dodecyl hexa(ethylene oxide), or C12E6, is mixed with the ionic surfactant sodium dodecyl sulfate, or SDS. In the other mixture, C12E6 is mixed with sodium dodecyl hexa(ethylene oxide) sulfate, or SDE6S. The SDE6S head, which contains six ethylene oxide units and a sulfate group, “interpolates” between C12E6 and SDS and allows us to investigate in detail the effects of electrostatic and steric interactions between the surfactant heads on mixed micelle formation and growth. For both surfactant mixtures, we measure the critical micelle concentration (cmc) as a function of solution composition, and we use static light scattering to measure the weight-average mixed micelle aggregation number as a function of both solution composition and total surfactant concentration. The analysis of the light scattering data accounts for both micelle growth and intermicellar interactions. We also infer the mixed micelle shape and hydration with combined static and dynamic light scattering measurements, and we qualitatively confirm the trends of micelle size as a function of solution composition with independent measurements of relative viscosity. The experimental mixture cmc and mixed micelle aggregation numbers compare well with those predicted by a recently developed molecular-thermodynamic theory of mixed micellization. The theory also permits a detailed analysis of the interplay of electrostatic and steric interactions affecting the formation and growth of mixed micelles in each surfactant mixture.

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“…It is well known that apart from the mole fraction, the viscosity is mainly affected by two parameters: (i) hydration of the colloidal particle surface and (ii) an electroviscous effect (19). Parker and Wasik (20) have reported that the electroviscous effect can be suppressed by the addition of an electrolyte.…”

Section: Viscosity Measurementsmentioning

confidence: 99%