Comparison of the van der Waals and Frumkin Adsorption Isotherms for Sodium Dodecyl Sulfate at Various Salt Concentrations

Kolev, Vesselin; Danov, Krassimir D.; Kralchevsky, Peter A.; Broze, Guy; Mehreteab, A.

doi:10.1021/la0259858

Cited by 96 publications

(115 citation statements)

References 27 publications

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“…µ (2) = 2.13kT is slightly greater than the adsorption energy of Na + ions at sulfate surface groups, 1.64kT [39,41,57]. The difference might be due to the nature of the surface groups: sulfate versus sialic acid.…”

Section: Parameter Values Determined From the Best Fitmentioning

confidence: 92%

“…For the system under consideration, we can expect that the negatively charged ionizable groups on the two membrane surfaces serve as adsorption sites for positively charged cations (K + , Na + , etc.). To describe the counterion adsorption, we will employ the Stern model [54][55][56], which has been found to compare very well with the experiment [57][58][59].…”

Section: Adsorption Of Counterions At the Membrane Surfacesmentioning

confidence: 99%

“…For the weak binding, the adsorption energy of a monovalent counterion is typically µ (i) ≈ 2kT, say 1.64kT for Na + ions at sulfate headgroups [39,41,57]. In this case, the binding energy can be attributed to a residual electrostatic attraction between oppositely charged counterions and surface groups, which is due to the discreteness of the surface charge (not taken into account by the continuum double layer theory) [39].…”

Section: Adsorption Of Counterions At the Membrane Surfacesmentioning

confidence: 99%

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On the mechanism of stomatocyte–echinocyte transformations of red blood cells: experiment and theoretical model

Tachev¹,

Danov²,

Kralchevsky³

2004

Colloids and Surfaces B: Biointerfaces

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This study represents an attempt to achieve a better understanding of the stomatocyte-echinocyte transition in the shape of red blood cells. We determined experimentally the index of cell shape at various ionic strengths and osmolarities for native and trypsin-treated human erythrocytes. For every given composition of the outer phase, we calculated the ionic strength in the cells and the transmembrane electric potential using a known theoretical model. Next, we described theoretically the electric double layers formed on both sides of the cell membrane, and derived expressions for the tensions of the two membrane leaflets. Taking into account that the cell-shape index depends on the tension difference between the two leaflets, we fitted the experimental data with the constructed physicochemical model. The model, which agrees well with the experiment, indicates that the tension difference between the two leaflets is governed by the different adsorptions of counterions at the two membrane surfaces, rather than by the direct contribution of the electric double layers to the membrane tension. Thus, with the rise of the ionic strength, the counterion adsorption increases stronger at the outer leaflet, whose stretching surface pressure becomes greater, and whose area expands relative to that of the inner leaflet. Hence, there is no contradiction between the bilayer-couple hypothesis and the electric double layer theory, if the latter is upgraded to account for the effect of counterion-adsorption on the membrane tension. The developed quantitative model can be applied to predict the shape index of cells upon a stomatocyte-discocyte-echinocyte transformation at varying composition of the outer medium.

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Section: Parameter Values Determined From the Best Fitmentioning

confidence: 92%

Section: Adsorption Of Counterions At the Membrane Surfacesmentioning

confidence: 99%

Section: Adsorption Of Counterions At the Membrane Surfacesmentioning

confidence: 99%

See 1 more Smart Citation

On the mechanism of stomatocyte–echinocyte transformations of red blood cells: experiment and theoretical model

Tachev¹,

Danov²,

Kralchevsky³

2004

Colloids and Surfaces B: Biointerfaces

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“…Kralchevsky et al derived the adsorption isotherms of surfactant ion and counterion for the aqueous solution of the mixture of ionic surfactant and electrolyte and revealed the importance of counterion binding to the adsorbed surfactant layer 10,15,16) . In addition, the integration of these adsorption isotherms provided the theoretical equation for the surface tension, and then, the surface potential at the air/water surface was estimated by applying the theoretical equation to the experimental data of surface tension.…”

Section: Introductionmentioning

confidence: 99%

“…correspond to the contribution of the diffuse electric double layer and the Langmuir model, respectively 15,16,21) . Furthermore, it is useful to rewrite Eq.…”

mentioning

confidence: 99%

Adsorption of Surfactant Ions and Binding of Their Counterions at an Air/Water Interface

et al. 2009

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An expression for the surface tension of an aqueous mixed solution of surfactants and electrolyte ions in the presence of the common ions was derived from the Helmholtz free energy of an air/water surface. By applying the equation to experimental data for the surface tension, the adsorption constant of surfactant ions onto the air/water interface, the binding constant of counterions on the surfactants, and the surface potential and surface charge density of the interface were estimated. The adsorption constant and binding constant were dependent on the species of surfactant ion and counterion, respectively. Taking account of the dependence of surface potential and surface charge density on the concentration of electrolyte, it was suggested that the addition of electrolyte to the aqueous surfactant solution brings about the decrease in the surface potential, the increase in the surface density of surfactant ions, and consequently, the decrease in the surface tension. Furthermore, it was found that the configurational entropy plays a predominant role for the surface tension, compared to the electrical work.

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Adsorption Characteristics of Ionic Surfactants at Water/Hexane Interface Obtained by PAT and ODBA

Mucic¹,

Pradines²,

Javadi³

et al. 2013

Emulsion Formation and Stability

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Comparison of the van der Waals and Frumkin Adsorption Isotherms for Sodium Dodecyl Sulfate at Various Salt Concentrations

Cited by 96 publications

References 27 publications

On the mechanism of stomatocyte–echinocyte transformations of red blood cells: experiment and theoretical model

On the mechanism of stomatocyte–echinocyte transformations of red blood cells: experiment and theoretical model

Adsorption of Surfactant Ions and Binding of Their Counterions at an Air/Water Interface

Adsorption Characteristics of Ionic Surfactants at Water/Hexane Interface Obtained by PAT and ODBA

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