Amphiphilic nanostructures in foam films

Mileva, Elena; Exerowa, D.

doi:10.1016/j.cocis.2007.11.002

Cited by 16 publications

(8 citation statements)

References 44 publications

(34 reference statements)

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“…The latter are essential structural components of foam systems, stabilized by LMM surfactants [5][6][7]. In our previous single-surfactant studies, it was clarified that equilibrium and dynamic surface tension isotherms might be correlated to the microscopic foam film's formation and stability [8][9][10][11]. We have found experimental evidence of the key role of the surface dilatational rheology, as well.…”

Section: Introductionmentioning

confidence: 80%

Impact of Adsorption Layer Properties on Drainage Behavior of Microscopic Foam Films: The Case of Cationic/Nonionic Surfactant Mixtures

Arabadzhieva

Tchoukov

Mileva

2020

Colloids and Interfaces

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Aqueous mixtures of cationic hexadecyltrimethylammonium chloride (CTAC) and nonionic pentaethyleneglycol monododecyl ether (C12E5) are investigated. Adsorption layer properties are systematically studied within a wide concentration range for a 1:1 molar ratio of the surfactants. Surface tension and dilatational rheology measurements are conducted by profile analysis tensiometry. The interfacial data are juxtaposed to drainage kinetics and stability results for microscopic foam films, investigated by microinterferometric thin liquid film instrumentation. The obtained results give experimental evidence of synergistic interactions in the studied solutions, as compared to the corresponding single surfactant systems. Specific runs of dynamic and equilibrium surface tension curves are registered against the total surfactant quantity; the surface dilatational elasticities for the mixtures are systematically higher. A clear correlation is established between adsorption layer performance and foam film characteristics. The maxima of the film lifetimes are well outlined, and the respective values are shifted towards lower overall concentrations. The reported results substantiate the key role of the adsorption layers, and the surface dilatational properties in particular, for foam film drainage kinetics and stability. The well-expressed synergy observed in adsorption layer and foam film properties suggests the substantial benefits of using mixed surfactant systems in the design and fine-tuning of foam systems for innovative applications.

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Section: Introductionmentioning

confidence: 80%

Impact of Adsorption Layer Properties on Drainage Behavior of Microscopic Foam Films: The Case of Cationic/Nonionic Surfactant Mixtures

Arabadzhieva

Tchoukov

Mileva

2020

Colloids and Interfaces

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“…These black pat- The "unstable" black formations (Fig. 7,a,b) belonging to the second type appear when there is some deficiency of the surfactant in the adsorption coverage on the interfaces for miscellaneous reasons [2,9,10,12]. These They live for 3÷10 s and do not grow in size.…”

Section: Foam Film Drainage Propertiesmentioning

confidence: 99%

“…They gave them the name 'premicelles'. In order to test this hypothesis, systematic experiments on the drainage kinetics of microscopic foam films obtained from solutions in the same concentration range as the surface tension measurements are performed [5][6][7][8][9][10][11][12]. The results show the onset of peculiarities in the drainage kinetics parameters as well.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, specific 'unstable' black patterns are observed in these films: black dots and black spots. In addition, several drainage characteristics change abruptly in concentration synchrony with the onset of the kink and plateau portions of surface tension isotherms [9,12]. The coupling of these results presents an experimental evidence of the presence of amphiphilic self-assemblies in the premicellar concentration domain.…”

Section: Introductionmentioning

confidence: 99%

“…In this case, the mechanism of foam film stabilization has much in common with the influence of nanoparticles and has been extensively studied in the last decade [14][15][16][17]. (ii) At intermediate concentrations (higher than the concentration where the Henry law is operative, but one-two orders of magnitude below the conventional CMC), the amphiphilic nanostructures are premicelles [2][3][4][5][6][7][8][9][10][11][12]. These are loose structures, which contain a lower number of amphiphilic molecules.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Amphiphilic Nanostructures on Formation and Rheology of Interfacial Layers and on Foam Film Drainage

et al. 2022

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The aim of the present studies is to clarify how the surfactant adsorption layer properties are related to the course of the drainage parameters of microscopic foam films in the special case of aqueous solutions containing premicellar amphiphilic nanostructures. The scope of the research covers the adsorption dynamics, construction of equilibrium adsorption isotherms, surface rheology of interfacial layers, and foam film drainage kinetics. It is established that, in the premicellar domain, there are concentration intervals, where the considerable irregularities of adsorption layerproperties are observed: several plateau regions in the surface tension isotherms, unusual changes of the surface rheological characteristics, etc. The systematic investigation of the drainage of foam films obtained from these solutions show that the dependences of basic kinetic parameters of the films on the amphiphile concentration run in synchrony with changes in the adsorption layer properties. Thus, the presence of smaller loose aggregates (premicelles) plays a significant role for the kinetic stability of films. The importance of this research is related toproviding a better insight into the initial stages of self-assembling phenomena and into the factors determining thedrainage and the stability of thin liquid films. The results have implications for the understanding and the correct prediction of properties of foam systems.

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On importance of external conditions and properties of the interacting phases in formation and stability of symmetrical and unsymmetrical liquid films

Zawała

Małysa

Kowalczuk

2020

Advances in Colloid and Interface Science

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Amphiphilic nanostructures in foam films

Cited by 16 publications

References 44 publications

Impact of Adsorption Layer Properties on Drainage Behavior of Microscopic Foam Films: The Case of Cationic/Nonionic Surfactant Mixtures

Impact of Adsorption Layer Properties on Drainage Behavior of Microscopic Foam Films: The Case of Cationic/Nonionic Surfactant Mixtures

Impact of Amphiphilic Nanostructures on Formation and Rheology of Interfacial Layers and on Foam Film Drainage

On importance of external conditions and properties of the interacting phases in formation and stability of symmetrical and unsymmetrical liquid films

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