Nonideal multicomponent mixed micelle model

Holland, Paul M.; Rubingh, Donn N.

doi:10.1021/j100234a030

Cited by 693 publications

(674 citation statements)

References 0 publications

Supporting

Mentioning

654

Contrasting

Unclassified

Order By: Relevance

“…However, the deviation from the ideal mixing curve is rather small and the mixed cac data lie between those of the single surfactants. The second analysis is based on the regular solution theory 10 . The following equations give the mole fractions of the surfactant component 1 BPS-5 in the monolayer adsorbed at the air/solution interface X 1 and in the molecular aggregates formed in the bulk solution X 1 , and the interaction parameters estimated for the adsorbed monolayer and molecular aggregates .…”

Section: Resultsmentioning

confidence: 99%

Nonionic Surfactant Mixtures in an Imidazolium-Type Room-Temperature Ionic Liquid

et al. 2011

View full text Add to dashboard Cite

INTRODUCTIONRoom-temperature ionic liquids RT-ILs are a relatively new class of organic solvents. Their unique physicochemical properties such as excellent thermal stability up to 300 or more, negligible volatility, and non-flammability make them ideal green solvents for many reactions of industrial importance. In the field of colloid and interface chemistry, RT-ILs have also received much attention 1, 2 . For example, a wide range of research papers on RT-ILs were reviewed and categorized by Inoue from the perspective of surfactant chemistry 3 . These categories comprised the following: i RT-ILs as a new type of surfactant, ii the effects of RT-ILs on the aqueous solution properties of surfactants, iii the formation of microemulsions using RT-ILs as polar solvents, and iv the self-assembly of surfactants in RT-ILs. Our interest lies in the fourth category 4, 5 . One of the key fi ndings we reported in a previous paper 4 is that phytosterol ethoxylates BPS-n, where n is an oxyethylene chain length of 5, 10, 20, and 30 exhibit excellent surface activity in an aprotic, imidazolium-type RT-IL 1-butyl-

show abstract

Section: Resultsmentioning

confidence: 99%

Nonionic Surfactant Mixtures in an Imidazolium-Type Room-Temperature Ionic Liquid

et al. 2011

View full text Add to dashboard Cite

show abstract

“…(5) to determine the surface tension, σ, and the composition of the adsorption layer, X 1S , above the CMC. [9] This model was used to evaluate the composition of the mixed micelles in the SDS/DADA solutions, taking into account the presence of DOH in the used SDS sample. The NMMM presents a generalization of the pseudo-phase separation model for treatment of multicomponent nonideal micelle systems.…”

Section: Modification Of the Nibm Methods By Ingram [8]mentioning

confidence: 99%

“…Based on this theory, approaches for determination of the composition of mixed adsorption layers and mixed micelles were proposed in [1,8]. Alternatively, the nonideality of the solution properties, caused by the interactions between various surfactant components in mixed micelles, could be analyzed by the regular solutions theory-this approach is implemented in the so-called nonideal multicomponent mixed micelle model (NMMM) developed in [9]. The composition of the mixed micelles and the concentrations of the individual monomers in the surfactant solution can be calculated by this model for multicomponent mixtures, containing even more than two components.…”

Section: Introductionmentioning

confidence: 99%

Composition of mixed adsorption layers and micelles in solutions of sodium dodecyl sulfate and dodecyl acid diethanol amide

Angarska¹,

Tachev²,

Denkov³

2004

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

The surface tension isotherms of dodecyl acid diethanole amide (DADA), sodium dodecyl sulfate (SDS) and their mixtures at different molar ratios are measured by the Wilhelmy-plate method. The isotherms are analyzed by the theory of nonideal interactions in binary surfactant mixtures (NIBM) and by the nonideal multicomponent mixed micelle model (NMMM). The molecular interaction parameters (MIP) on the interface, β S , and in the micelles, β M , are determined by the NIBM method. By using the Ingram's modification of this method, we calculate the compositions of the mixed adsorption layers and of the micelles, as functions of DADA and SDS concentrations both below and above the critical micelle concentration (CMC). It is shown that the DADA molecules prevail on the surface and in the micelles (>50%) at concentrations around CMC even when DADA presents a small fraction in the surfactant mixture (5 mol%). This result is explained by the much higher surface activity of DADA in comparison with SDS. At concentrations, which are about 1 order of magnitude above the CMC, the composition of the micelles approaches the composition of the total surfactant mixture. The composition of the surfactant adsorption layer also becomes much closer to the composition of the total surfactant mixture at concentrations well above the CMC. The results for the micelles composition at moderate and high molar fractions of DADA in the surfactant mixture (above 10 mol%), obtained by NMMM and by NIBM methods, agree well with each other. A discrepancy between the results obtained by these two models is found at low DADA fraction in the mixture, and this discrepancy is explained by the presence of traces of dodecanol (DOH) in the used SDS sample.

show abstract

“…Then, nonideality of mixing has been taken into consideration by applying regular solution theory. Recently, several molecular thermodynamic theories have been developed for predicting the properties and interactions in binary surfactant systems [11][12][13] and analyzed in terms of different formalisms like that of Clint, Rubingh, Rosen, Motomura, Lange, and Clint, [14][15][16][17][18][19][20] to understand their behavior in aqueous solutions which based on phase separation model and assumes ideal mixing of the surfactants in the micellar phase. Rubingh proposed a treatment based on regular solution theory (RST) for nonideal mixed systems which have been extensively used.…”

Section: Introductionmentioning

confidence: 99%

“…Rubingh proposed a treatment based on regular solution theory (RST) for nonideal mixed systems which have been extensively used. Apart from this, the study of Singh et al 21 and Maeda et al 22 used the treatment of Rosen et al 23 who improved the nonideal solution treatment of Rubingh 17 for mixed micelle formation by binary surfactant systems to estimate, the surfactant molecular interaction and also the composition in the adsorbed monolayer at the air/water interface. The molecular thermodynamic approach, [24][25][26] on the other hand, suggests that electrostatic interactions among the ionic and polar head groups cause nonideality of the surfactant mixing.…”

Section: Introductionmentioning

confidence: 99%

Interaction between cationic and conventional nonionic surfactants in the mixed micelle and monolayer formed in aqueous medium

Negm¹,

Sabagh²

2011

Quím. Nova

View full text Add to dashboard Cite

Mixed micellization and surface properties of cationic and nonionic surfactants dimethyl decyl-, tetradecyl-and hexadecyl phosphineoxide mixtures are studied using conductivity and surface tension measurements. The models of Rubingh, Rosen, and Clint, are used to obtain the interaction parameter, minimum area per molecule, mixed micelle composition, free energies of mixing and activity coefficients. The micellar mole fractions were always higher than ideal values indicating high contributions of cationics in mixed micelles. Activity coefficients were less than unity indicating synergism in micelles. The negative free energies of mixing showed the stability of the surfactants in the mixed micelles.

show abstract

Nonideal multicomponent mixed micelle model

Cited by 693 publications

References 0 publications

Nonionic Surfactant Mixtures in an Imidazolium-Type Room-Temperature Ionic Liquid

Nonionic Surfactant Mixtures in an Imidazolium-Type Room-Temperature Ionic Liquid

Composition of mixed adsorption layers and micelles in solutions of sodium dodecyl sulfate and dodecyl acid diethanol amide

Interaction between cationic and conventional nonionic surfactants in the mixed micelle and monolayer formed in aqueous medium

Contact Info

Product

Resources

About