Surface tensions of non-ideal surfactant mixtures

Ingram, B. T.

doi:10.1007/bf01498280

Cited by 53 publications

(30 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The measured surface tension isotherms were analyzed also by the modification of the NIBM method, suggested by Ingram [8], which is based on the following set of two equations for the composition of the mixed adsorption layer:…”

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

confidence: 99%

“…Close to CMC, these functions are assumed [8] to obey the equation Φ = exp(K − K σ), where K and K are constants characterizing the used surfactant. The constants K 1 , K 1 and K 2 , K 2 for DADA and SDS, respectively, were determined from the surface tension isotherms of the individual surfactants (see Fig.…”

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

confidence: 99%

“…The micelles composition at CMC was evaluated by the following set of equations [8]: where β M is the interaction constant in the micelle; X 1M , molar part of surfactant 1 in the mixed micelle; C 1M and C 2M , CMCs of the individual surfactants. In fact, Eqs.…”

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

confidence: 99%

“…That is why, the calculated values for the interaction parameters, β S and β M , and the compositions of the surface layer at σ = 33.5 mN m −1 and of the micelles at CMC, determined by the two models, were exactly the same (see Table 1). However, the approach of Ingram [8] allows one to calculate the surface tension isotherms and the composition of the adsorption layers for surfactant mixtures at arbitrary surfactant concentrations below and above the CMC. The composition of the mixed micelles can be also calculated by this method.…”

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].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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

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

confidence: 99%

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

confidence: 99%

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

confidence: 99%

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

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

show abstract

Effect of amount of emulsifier added in the second stage on morphology of composite latex particles

Yan

Chen

et al. 1998

J. Appl. Polym. Sci.

View full text Add to dashboard Cite

In this article, PBA/P(MMA-crosslinking agent)-composite particle latexes were prepared by semicontinuous seeded emulsion polymerization. To determine the seed emulsion's saturating capacity of an emulsifier, a mathematical model was built to simulate the changes of the seed PBA emulsion's surface tension with the amount of emulsifier added dropwise. The effects of the emulsifier amount added in the second stage and the addition method on the morphology of the composite particles were studied. The results were shown as follows: If the amount of emulsifier added in one batch to the seed emulsion in the second stage was less than or equal to the saturating capacity of emulsifier of the seed emulsion (Cs), the morphology of the particles was ''core-shell''; otherwise, a few particles were of a core-shell structure. However, if shell materials were preemulsified and added dropwise at an appropriate rate, the latex particles were still of a core-shell structure, even when the amount of emulsifier added to the seed emulsion was greater than the Cs. ᭧ 1998 John Wiley & Sons, Inc. J Appl Polym Sci 68: 969-975, 1998

show abstract

Molecular Interactions and Synergism in Mixtures of Two Surfactants

Rosen

Kunjappu²

2012

Surfactants and Interfacial Phenomena

View full text Add to dashboard Cite

Surface tensions of non-ideal surfactant mixtures

Cited by 53 publications

References 6 publications

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

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

Effect of amount of emulsifier added in the second stage on morphology of composite latex particles

Molecular Interactions and Synergism in Mixtures of Two Surfactants

Contact Info

Product

Resources

About