Adsorption layer characteristics of Triton surfactants

Fainerman, V. B.; Lylyk, S. V.; Aksenenko, E. V.; Makievski, A. V.; Petkov, Jordan T.; Yorke, Janelle; Miller, R.

doi:10.1016/j.colsurfa.2008.09.015

Cited by 94 publications

(91 citation statements)

References 31 publications

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“…Neglecting the contribution of nonideality of entropy, the Frumkin equations are given by Equations (1)- (3): [34,35] in which p = g o Àg is the surface pressure; g o and g are the surface tensions of pure water and of the solution, or dispersion, investigated, respectively; q 1 and q 2 are the surface coverages of molecules 1 and 2, respectively (q 1 = w 1 G 1 and q 2 = w 2 G 2 , in which w 1 and w 2 are the molar areas, and G 1 and G 2 are the adsorption parameters); a i , b i , are c i (i = 1, 2) are the interaction constant be- www.chemphyschem.org tween molecules 1 and 1 or 2 and 2, the adsorption equilibrium constant of molecule 1 or 2, and the concentration of molecule 1 or 2 in the bulk volume, respectively. a 12 is the interaction constant between molecules 1 and 2. n 1 = w 1 /w and n 2 = w 2 /w; w is the mean molar area defined by w = (w 1 G 1 + w 2 G 2 )/(G 1 +G 2 ).…”

Section: Modified Frumkin Adsorption Modelmentioning

confidence: 99%

“…The theoretical variation of the surface tension as a function of PL concentration has been calculated by using the Frumkin equations. [34,35] The Frumkin model is better adapted than the Gibbs model for the description of the adsorption of DiC 8 -PC because it takes into account interactions between molecules. As shown in Figure 4, an excellent fit is found between the theoretical curves and the experimental data.…”

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confidence: 99%

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A Nonpolar, Nonamphiphilic Molecule Can Accelerate Adsorption of Phospholipids and Lower Their Surface Tension at the Air/Water Interface

et al. 2011

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The adsorption dynamics of a series of phospholipids (PLs) at the interface between an aqueous solution or dispersion of the PL and a gas phase containing the nonpolar, nonamphiphilic linear perfluorocarbon perfluorohexane (PFH) was studied by bubble profile analysis tensiometry. The PLs investigated were dioctanoylphosphatidylcholine (DiC(8)-PC), dilaurylphosphatidylcholine, dimyristoylphosphatidylcholine, and dipalmitoylphosphatidylcholine. The gas phase consisted of air or air saturated with PFH. The perfluorocarbon gas was found to have an unexpected, strong effect on both the adsorption rate and the equilibrium interfacial tension (γ(eq)) of the PLs. First, for all of the PLs, and at all concentrations investigated, the γ(eq) values were significantly lower (by up to 10 mN m(-1)) when PFH was present in the gas phase. The efficacy of PFH in decreasing γ(eq) depends on the ability of PLs to form micelles or vesicles in water. For vesicles, it also depends on the gel or fluid state of the membranes. Second, the adsorption rates of all the PLs at the interface (as assessed by the time required for the initial interfacial tension to be reduced by 30%) are significantly accelerated (by up to fivefold) by the presence of PFH for the lower PL concentrations. Both the surface-tension reducing effect and the adsorption rate increasing effect establish that PFH has a strong interaction with the PL monolayer and acts as a cosurfactant at the interface, despite the absence of any amphiphilic character. Fitting the adsorption profiles of DiC(8)-PC at the PFH-saturated air/aqueous solution interface with the modified Frumkin model indicated that the PFH molecule lay horizontally at the interface.

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Section: Modified Frumkin Adsorption Modelmentioning

confidence: 99%

mentioning

confidence: 99%

A Nonpolar, Nonamphiphilic Molecule Can Accelerate Adsorption of Phospholipids and Lower Their Surface Tension at the Air/Water Interface

et al. 2011

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“…Reorientation model (or two-state model) describes well adsorption behaviour of different oxyethylene surfactants on liquid-air interfaces [2][3][4][5][6]. At low surface concentrations both carbohydrate and oxyethylene groups of those surfactants adsorb simultaneously.…”

Section: Reorientation Modelmentioning

confidence: 99%

“…The theoretical two states models were used to describe the equilibrium surface tension and adsorption of surfactants and were described in earlier elsewhere [6,[7][8][9][10]. Therefore, only the main equations for each applied model are given below.…”

Section: Reorientation Modelmentioning

confidence: 99%

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Equilibrium and dynamic surface properties of trisiloxane aqueous solutions. Part 2. Theory and comparison with experiment

Ritacco

Fainerman

Ortega

et al. 2010

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Accurate and sensitive probing of onset of micellization based on absolute aggregation‐caused quenching effect

Liu

Jiang

et al. 2022

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Probing the onset of micellization, or determining the critical micelle concentration (CMC), is of crucial importance while remains to be challenged by growing demand for extraordinary sensitivity and accuracy. Although fluorometry has attracted wide attention owing to its superiority in simplicity and sensitivity over other methods, the presence and fluctuation of background fluorescence of conventional fluorescent probes undermine the accuracy of CMC determination. Herein, a series of novel fluorescent probes without background fluorescence at a concentration below CMC owing to absolute aggregation‐caused quenching (aACQ) are utilized for sensitive and accurate measurement of CMC. The aACQ probes aggregate spontaneously and instantly in an aqueous environment owing to molecular π–π stacking with fluorescence quenching absolutely. Therefore, the absence of background fluorescence at a concentration below CMC clears relevant interference associated with conventional fluorophores. In this study, the new method is applied for versatile surfactants with CMCs ranging from nanomolar to millimolar concentrations, especially copolymers with ultralow CMC. The higher sensitivity and accuracy are highlighted by comparison with conventional probes.

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Adsorption layer characteristics of Triton surfactants

Cited by 94 publications

References 31 publications

A Nonpolar, Nonamphiphilic Molecule Can Accelerate Adsorption of Phospholipids and Lower Their Surface Tension at the Air/Water Interface

A Nonpolar, Nonamphiphilic Molecule Can Accelerate Adsorption of Phospholipids and Lower Their Surface Tension at the Air/Water Interface

Equilibrium and dynamic surface properties of trisiloxane aqueous solutions. Part 2. Theory and comparison with experiment

Accurate and sensitive probing of onset of micellization based on absolute aggregation‐caused quenching effect

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