The Viscous Properties of Anionic/Cationic and Cationic/Nonionic Mixed Surfactant Systems

Akbaş, Halide; Sidim, Taliha

doi:10.1007/s10595-005-0128-y

Cited by 9 publications

(3 citation statements)

References 30 publications

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“…The variety of interaction mechanisms between solutes and the matrices suggests that it may be possible to tailor binding to suit a mixture under study by using mixtures of matrix components. [32] In a simple-minded approach, we would then expect behavior that is a weighted average of those of the different components. Clearly, this is a large oversimplification; components may interact with each other in unpredictable ways and form new types of complexes.…”

Section: Discussionmentioning

confidence: 99%

Matrix‐assisted diffusion‐ordered spectroscopy: choosing a matrix

Gramosa

Ricardo

Adams

et al. 2016

Magnetic Reson in Chemistry

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Diffusion‐ordered spectroscopy (DOSY) is an important technique for separating the NMR signals of the components in a mixture, and relies on differences in diffusion coefficient. Standard DOSY experiments therefore struggle when the components of a mixture are of similar size, and hence diffuse at similar rates. Fortunately, the diffusion coefficients of solutes can be manipulated by changing the matrix in which they diffuse, using matrix components that interact differentially with them, a technique known as matrix‐assisted DOSY. In the present investigation, we evaluate the performance of a number of new, previously used, and mixed matrices with an informative test mixture: the three positional isomers of dihydroxybenzene. The aim of this work is to present the matrix‐assisted DOSY user with information about the potential utility of a set of matrices (and combinations of matrices), including ionic and non‐ionic surfactants, complexing agents, polymers, and mixed solvents. A variety of matrices improved the diffusion resolution of the signals of the test system, with the best separation achieved by mixed micelles of sodium dodecyl sulfate and cetyl trimethylammonium bromide. The use of mixed matrices offers great potential for the analyst to tailor the matrix to a particular sample under study. © 2016 The Authors Magnetic Resonance in Chemistry Published by John Wiley & Sons, Ltd.

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Section: Discussionmentioning

confidence: 99%

Matrix‐assisted diffusion‐ordered spectroscopy: choosing a matrix

Gramosa

Ricardo

Adams

et al. 2016

Magnetic Reson in Chemistry

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“…The CMCs of SDS and CTAB in pure water are 8 and 0.9 mM, respectively. 47,48 (The exact CMC values are dependent on environmental conditions such as pH, ionic strength, and temperature, and so they may be somewhat different in our emulsion systems.) Ionic surfactants tend to form micellelike aggregates with polyelectrolytes at a considerably lower concentration than the CMC.…”

Section: Discussionmentioning

confidence: 99%

Influence of Ionic Surfactants on the Microstructure of Heat-Set β-Lactoglobulin-Stabilized Emulsion Gels

et al. 2006

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Using confocal microscopy, we studied the effect of heating (up to 85°C) on the microstructure of β-lactoglobulin-stabilized emulsions (20 vol% oil, pH 6.8) containing excess protein (total protein content 13.2%). Two different fluorescent dyes were used to separately visualize the oil droplets and the protein. In overlay micrographs, their location with respect to each other could then be determined. In the presence of a low salt concentration, flocculation of the emulsion without surfactant was inhibited, by a mechanism analogous to the "salting-in" of aqueous protein solutions. Addition of the anionic surfactant sodium dodecyl sulfate (SDS) caused weak flocculation, probably as a result of the formation of protein−SDS complexes. The final heat-set emulsion contained distinct pores for a surfactant/protein ratio of R = 1, but no pores for R = 2. Addition of the cationic surfactant cetyl trimethyl ammonium bromide (CTAB) caused strong aggregation, as indicated by microscopic observation of the concentrated emulsion and light scattering of the diluted emulsion. For R = 1 with CTAB, there were aggregates consisting of oil droplets and excess protein. At R = 2, almost all the excess protein was aggregated into separate protein flakes. In the final emulsion gels containing CTAB, the protein was more spread out. Differing structural behavior with anionic and cationic surfactants has been interpreted in terms of different protein−surfactant interactions in aqueous solution and at the oil−water interface, both before and after protein denaturation.

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“…These phenomenons are most likely due to the interaction of ordered assembles in ATPS. Previous study shows that [23] precipitation are generated in the cationic and anionic surfactant mixture system if electrostatic attraction between the polar groups is stronger, micelles are produced when electrostatic repulsion is stronger, and ATPS are formed only when two electrostatic interactions are identical to each other. Therefore, the width of ATPS range actually depends on the latitude of electrostatic attraction and electrostatic repulsion of ordered assembles in ATPS.…”

Section: Influence Of Carbon-chain Length On the Width Of Atpsmentioning

confidence: 97%

Effects of Surfactant Carbon-Chain Length on the Phase Behaviors of ATPS

Teng

Chen

et al. 2011

Journal of Dispersion Science and Technology

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The phase behaviors and properties of alkyl trimethyl ammonium bromide with different carbon-chain length/sodium dodecyl sulfate (SDS)/NaBr/H 2 O systems at the total surfactant concentration of 0.1 mol Á L À1 at 333 K were investigated. The experimental results indicate that the phase behaviors of different systems have similar distributing rules. The carbon-chain length of cationic surfactant can influence the position of aqueous two-phase system region, especially for aqueous two-phase system with cationic surfactant in excess, but only have slight effect on aqueous two-phase system with anionic surfactant in excess. The ATPSc region narrows as the length of carbon-chain increases, while the trend for ATPSa is opposite. Increasing the carbon-chain length to some extent will be favorable to shortening the formation time of ATPS greatly. The investigations illustrate that the above rules result from a hydrophobic interaction relationship between surfactant molecules.

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The Viscous Properties of Anionic/Cationic and Cationic/Nonionic Mixed Surfactant Systems

Cited by 9 publications

References 30 publications

Matrix‐assisted diffusion‐ordered spectroscopy: choosing a matrix

Matrix‐assisted diffusion‐ordered spectroscopy: choosing a matrix

Influence of Ionic Surfactants on the Microstructure of Heat-Set β-Lactoglobulin-Stabilized Emulsion Gels

Effects of Surfactant Carbon-Chain Length on the Phase Behaviors of ATPS

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