scholarly journals Synergism of non-ionic and anionic surfactants in a binary solution.

2020 ◽  
Vol 11 (3-2020) ◽  
pp. 62-68
Author(s):  
A. S. Genevskaya ◽  
◽  
G. V. Mitrofanova ◽  
◽  
Keyword(s):  
Adsorption Layer ◽  
Mixed Micelles ◽  
Anionic Surfactants ◽  
Binary Solution ◽  
Micelle Formation ◽  
Ionic Component ◽  
Solution Composition ◽  
Binary Solutions ◽  
Air Interface ◽  
Adsorption Layers

Adsorption at the gas —air interface and micelle formation in binary solutions of ethoxylated alkyl phenol (Neonol AF 9-10) and sodium oleate have been studied. The Rubin and Rosen equations were used to determine the interaction parameters and the composition of mixed micelles and adsorption layers depending on the initial solution composition. The authors have found out that the micelles and the adsorption layer at the interface are enriched in a non-ionic component. The maximum synergistic effect during micelle formation was found for solutions containing 20–30 % molar of reagent Neonol AF 9-10, and during adsorption —20 and 50 %.

scholarly journals Molecular Interactions in Binary Surfactant Solutions: Effect of pH

2019 ◽  
Vol 64 (4) ◽  
pp. 437-445
Author(s):  
Olga Kochkodan ◽  
Victor Maksin ◽  
Nadiya Antraptseva ◽  
Tetyana Semenenko
Keyword(s):  
Molecular Interactions ◽  
Mixed Micelles ◽  
Ph Value ◽  
Chemical Properties ◽  
Micelle Formation ◽  
Bulk Solution ◽  
Surfactant Mixtures ◽  
Solution Ph ◽  
Solution Interface ◽  
Adsorption Layers

By using surface tension and conductivity measurements, the colloid-chemical properties of the mixtures of cationic hexadecylpyridinium bromide with nonionic Triton X-100 surfactants were investigated both in the bulk solution and at air/solution interface at different pH values. The composition of mixed micelles and adsorption layers, parameters of molecular interactions in mixed micelles βm and adsorption layers βσ, as well as standard free energies of micelle formation ΔG0mic and adsorption ΔG0ads were calculated. It was found that molecules of the nonionic surfactant presumably dominate in the mixed micelles and adsorption layers. It was shown that βm and βσ have negative values, which indicate the strengthening of intermolecular interactions in the mixed micelles and adsorption layers. Based on the data obtained, it was suggested that ion-dipole interactions are involved in the formation of intermolecular structures between nonionic and cationic surfactants in aqueous solution and at the air-solution interface. It was shown that βm, βσ as well as ΔG0mic and ΔG0ads parameter depends on the solution pH value. The complex interplay of ion-dipole, protonation and chelation processes, which occur in the surfactant mixtures at different pH and affect the strength of intermolecular interaction, should be taken into account for data analysis.

scholarly journals ANALYSIS OF INTERMOLECULAR INTERACTIONS IN MIXED ADSORPTION LAYERS OF SURFACTANTS

2019 ◽  
Vol 85 (5) ◽  
pp. 69-74
Author(s):  
Olha Kochkodan ◽  
Nadiya Antraptseva ◽  
Roman Zhyla
Keyword(s):  
Adsorption Layer ◽  
Chemical Nature ◽  
Binary Solution ◽  
Molar Fraction ◽  
Graphitized Carbon Black ◽  
Ionic Surfactant ◽  
Surface Active ◽  
Triton X ◽  
Adsorption Layers ◽  
Mixed Systems

The adsorption of the surfactants mixtures of different chemical nature such as Triton X-100 and sodium hexadecyl sulfate at the surface of graphitized carbon black was studied. Using the model of phase separation (the Rubi–Rosen approach), the composition of the mixed adsorption layers and parameters of interaction between the surfactant molecules in the adsorption layers were calculated. It was found that mixed adsorption layers are enriched with molecules of the non-ionic surfactant Triton X-100. The purpose of the work was to study the adsorption of binary mixtures of surfactants of various chemical nature on the surface of non-porous hydrophobic carbon sorbent at different SAS ratio in mixtures. The results of calculations show that the composition of the adsorption layer on the surface of the GC is significantly different from the ratio of surfactants in the solution. The value of the parameter χ indicates that the mixed adsorption layer on the surface of the GC is enriched with non-ionic surfactant molecules, even with a small its content in the solution (αTХ-100 = 0,2). With an increase in the ТХ-100 molar fraction in the binary solution from 0,2 to 0,8 its share in the adsorption layer increases in approximately 1.5 times. Negative values of the interaction parameters βs indicate excessive attraction of the molecules and ions of the mixture components in the mixed adsorption layers. An increase in the absolute value of the parameter βs with an increase in αTХ-100 in the solution characterizes the enhancement of the interactions between the components in the adsorption layer. Thus, in the course of experiments carried out for mixed systems of SHDS-ТХ-100, the existence of a synergistic effect in relation to an increase in the adsorption of surfactants on the GC surface was established. It is found that mixed adsorption layers are enriched with molecules of the non-ionic surface  active  substance  of  the  triton  X-100.

Studies of a Mixed Adsorption Layer of Butan-1-ol and o-Toluidine on Mercury Electrode

2002 ◽  
Vol 67 (11) ◽  
pp. 1579-1588 ◽  
Author(s):  
Dorota Sieńko ◽  
Dorota Gugała ◽  
Jolanta Nieszporek ◽  
Joanna Jankowska ◽  
Jadwiga Saba
Keyword(s):  
Thermodynamic Analysis ◽  
Adsorption Layer ◽  
Supporting Electrolyte ◽  
Mercury Electrode ◽  
Interaction Constant ◽  
Repulsive Interaction ◽  
Surface Excess ◽  
Adsorption Parameters ◽  
Frumkin Isotherm ◽  
Adsorption Layers

The results of thermodynamic analysis of o-toluidine adsorption on a mercury electrode in the presence of various butan-1-ol amounts complete our previous studies on properties of mixed adsorption layers of toluidine isomers-butan-1-ol. The values of the relative surface excess Γ'°T obtained for o-toluidine show that adsorption of this compound decreases with increasing of butan-1-ol concentration. Analysis of adsorption parameters derived from the Frumkin isotherm indicates that in the presence of 0.33 M BuOH in 1 M NaClO4 with adjusted pH 3 as supporting electrolyte, ∆G0 values for o-toluidine are the highest and, at the same time, the strongest repulsive interaction occurs. In the presence of 0.11 M butan-1-ol, smaller values of ∆G0 for o-toluidine correspond to weaker repulsive interaction. Therefore the change of the Γ'°T value for o-toluidine as a function of butan-1-ol concentration is the result of mutual changes of ∆G0 and interaction constant A between adsorbate molecules.

Influence of taurocholate, taurochenodeoxycholate, and taurodehydrocholate on sulfobromophthalein transport into bile.

1979 ◽  
Vol 236 (1) ◽  
pp. E10
Author(s):  
S Binet ◽  
Y Delage ◽  
S Erlinger
Keyword(s):  
Bile Salts ◽  
Mixed Micelle ◽  
Mixed Micelles ◽  
Important Determinant ◽  
Micelle Formation ◽  
Similar Increase ◽  
Mixed Micelle Formation ◽  
Series Of Experiments

To test the hypothesis that incorporation of sulfobromophthalein (BSP) into mixed micelles could account for the increase in its biliary transport maximum (Tmax) by bile salts, we have compared in hamsters the influence on BSP Tmax of taurocholate and taurochenodeoxycholate (two micelle-forming physiological bile salts) to that of taurodehydrocholate, a bile salt which, in vitro, does not form micelles. In a first series of experiments, it was observed that taurocholate and taurochenodeoxycholate increased the secretion of phospholipid (40 and 53%, respectively), and cholesterol (50 and 110%, respectively), whereas taurodehydrocholate decreased the secretion of phospholipid (-31%) and cholesterol (-43%). This result suggests that, in vivo, taurodehydrocholate or its metabolites do not form mixed micelles. In a second series of experiments, it was seen that the three bile salts induced a similar increase in BSP Tmax (63% with taurocholate, 52% with taurochenodeoxycholate, and 51% with taurodehydrocholate). These results provide circumstantial evidence for the hypothesis that mixed micelle formation is not an important determinant of maximal BSP secretion into bile.

Temperature effect on the viscoelastic properties of solutions of cylindrical mixed micelles of zwitterionic and anionic surfactants

2010 ◽  
Vol 72 (2) ◽  
pp. 230-235 ◽  
Author(s):  
D. A. Kuryashov ◽  
O. E. Philippova ◽  
V. S. Molchanov ◽  
N. Yu. Bashkirtseva ◽  
I. N. Diyarov
Keyword(s):  
Temperature Effect ◽  
Viscoelastic Properties ◽  
Mixed Micelles ◽  
Anionic Surfactants

The specificity for κ-casein as the stabilizer of αs-casein and β-casein. I. Replacement of κ-casein by other proteins

1971 ◽  
Vol 38 (1) ◽  
pp. 9-23 ◽  
Author(s):  
Margaret L. Green
Keyword(s):  
Incubation Period ◽  
Micelle Formation ◽  
The Other ◽  
Ionic Component

SummaryThe specificity of the interaction betweenκ-casein,αs-casein andβ-casein which forms the basis of micelle stabilization was studied by investigating the extent to whichκ-casein could be replaced by other proteins. Of those tested, only gelatin replacedκ-casein and even it was only 2·5% (w/v) as effective and required a long pre-incubation period. The micelles formed by each ofκ-casein and gelatin withαs-casein and Ca2+were of a similar size to the casein—Ca complexes which compose natural micelles. Gelatin also formed complexes withαs- and withβ-casein at 30°C in the absence of CaCl2. Evidence was obtained that the interactions between gelatin and the caseins had a much stronger ionic component than had those betweenκ-casein and the other caseins. It was concluded that the interactions betweenκ-casein andαs- andβ-caseins which lead to micelle formation are highly specific and probably involve definite sites in each molecule.

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