Current applications of foams formed from mixed surfactant–polymer solutions

Bureiko, A.; Trybała, Anna; Kovalchuk, N. M.; Starov, Victor

doi:10.1016/j.cis.2014.10.001

Cited by 175 publications

(80 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Structurally, as foams consist of thin films separated by gas pockets, the stability, lifetime, rheology and applications of liquid foams are intimately linked to the drainage and rupture kinetics of thin liquid films. Slower drainage rates and more stable foams are desirable in firefighting, 12,13 mining industry, 14 certain foods and beverages, 15 and cosmetics 16,17 among others. [6][7][8][9][10][11] In an absolute sense, foams (and in fact all colloidal dispersions) are thermodynamically unstable, 11 though practically speaking, systems can be categorized as relatively short-lived or reasonably long-lived (timescale of minutes to hours to years).…”

Section: Introductionmentioning

confidence: 99%

Domain expansion dynamics in stratifying foam films: experiments

2015

View full text Add to dashboard Cite

The stability, rheology and applications of foams, emulsions and colloidal sols depend on the hydrodynamics and thermodynamics of thin liquid films that separate bubbles, drops and particles respectively. Thin liquid films containing micelles, colloidal particles, liquid crystals or polyelectrolyte-surfactant mixtures exhibit step-wise thinning or stratification, often attributed to the layer-by-layer removal of the aforementioned supramolecular structures. Stratification proceeds through emergence and growth of thinner circular domains within a thicker film, and the domain expansion dynamics are the focus of this study. Domain and associated thickness variation in foam films made from sodium dodecyl sulfate (SDS) micellar solutions are examined using a Scheludko-type cell with a novel technique we call Interferometry Digital Imaging Optical Microscopy (IDIOM). Below 100 nm, stratification and drainage cause a thickness-dependent variation in reflected light intensity, visualized as progressively darker shades of gray. We show that the domain expansion dynamics exhibit two distinct growth regimes with characteristic scaling laws. Initially, the radius of the isolated domains grows with square root time, and the expansion rate can be characterized by an apparent diffusion constant. In contrast, after a section of the expanding domain coalesces with the Plateau border, the contact line between domain and the surrounding thicker region moves a constant velocity. We show that a similar transition from a constant diffusivity to a constant velocity regime is also realized when a topological instability occurs at the contact line between the growing thinner isolated domain and the surrounding thicker film. Though several studies have focused on the expansion dynamics of isolated domains that exhibit a diffusion-like scaling, the change in expansion kinetics observed after domains contact with the Plateau border has not been reported and analyzed before.

show abstract

Section: Introductionmentioning

confidence: 99%

Domain expansion dynamics in stratifying foam films: experiments

2015

View full text Add to dashboard Cite

show abstract

“…Surfactants are the main component of foaming agents. To improve the foaming ability of foaming agents, some scholars have tried to add water-soluble polymers to surfactant solutions [32]. Xu et al [33] reported that the water-soluble polymer welan gum increased the foaming ability and foam stability of the anionic surfactant sodium fatty alcohol polyoxyethylene ether sulfate (AES) solution.…”

Section: Introductionmentioning

confidence: 99%

Improvement of Foaming Ability of Surfactant Solutions by Water-Soluble Polymers: Experiment and Molecular Dynamics Simulation

Wang

et al. 2020

Polymers

View full text Add to dashboard Cite

Aqueous foam is widely used in fire extinguishing and dust suppression technologies. Improving the foaming ability is the key to reducing the added concentration of foaming agents as well as the economic cost. In this work, the effect of a water-soluble polymer (polyvinyl alcohol, PVA) on the foaming ability of anionic surfactant (sodium dodecyl ether sulfate, SDES) was studied by an experiment and molecular dynamics simulation. The experimental results showed that PVA greatly improves the foaming ability of SDES solutions when the surfactant concentration is less than 0.1%, which is attributed to the fact that the polymer can enhance the stability of bubble films and reduce the bubble rupture rate during the foam generation process. The simulation results indicate that PVA can enhance the hydration of surfactant head groups and contribute to the formation of a three-dimensional hydrogen bond network between surfactants, polymers, and water molecules, thus greatly improving the stability of bubble liquid films. The above results suggest that water-soluble polymers can be used to improve the foaming ability of surfactant solutions by enhancing the bubble film stability, which is beneficial as it reduces the added concentration of foaming agents in aqueous foam applications.

show abstract

“…They are present also in the wetting films intervening between the oil drop and the substrate. For this reason, the surfactant-polymer interactions in the bulk and in the thin liquid films [15,[17][18][19][20][21], are of primary importance for the oil-drop deposition. Electrostatic, hydrophobic, and polymer-bridging surface forces are expected to govern the oil-drop deposition [14,22,23].…”

Section: Introductionmentioning

confidence: 99%

Oil drop deposition on solid surfaces in mixed polymer-surfactant solutions in relation to hair- and skin-care applications

Stanimirova

Kralchevsky

Danov

et al. 2019

Colloids and Surfaces A: Physicochemical and Engineering Aspect

View full text Add to dashboard Cite

The deposition of oil drops on solid substrates from mixed solutions of surfactants and cationic polymer is investigated. The used anionic surfactants are sodium laurylethersulfate (SLES) and sulfonated methyl esters (SME); the zwitterionic surfactant is cocamidopropyl betaine (CAPB). A new method, called the pressed drop method (PDM), was proposed to study the drop adhesion to substrates of different hydrophobicity. The PDM allows one to detect the presence or absence of drop adhesion at different degrees of dilution of the initial solution and, thus, to determine the threshold concentration of drop adhesion. The results show that the increase of the fraction of CAPB in the mixture with the anionic surfactant suppresses the oil-drop deposition; SME provides easier drop adhesion than SLES; the addition of NaCl enhances, whereas coco-fatty-acid-monoethanolamide (CMEA) suppresses the drop deposition; no drop adhesion is observed in the absence of polymer. The drop-tosubstrate adhesion is interpreted in terms of the acting surface forces: polymer bridging attraction; hydrophobic attraction between segments of adsorbed polymer brushes and electrostatic forces. From viewpoint of applications, the PDM experiments enable one to compare the performance of various components in personal care formulations and to optimize their composition with respect to the oil-drop deposition.

show abstract

Current applications of foams formed from mixed surfactant–polymer solutions

Cited by 175 publications

References 65 publications

Domain expansion dynamics in stratifying foam films: experiments

Domain expansion dynamics in stratifying foam films: experiments

Improvement of Foaming Ability of Surfactant Solutions by Water-Soluble Polymers: Experiment and Molecular Dynamics Simulation

Oil drop deposition on solid surfaces in mixed polymer-surfactant solutions in relation to hair- and skin-care applications

Contact Info

Product

Resources

About