Dynamic surface tensions, foam and the transition from micellar solution to lamellar phase dispersion

Garrett, Peter R.; Gratton, Pete

doi:10.1016/0927-7757(95)03218-3

Cited by 24 publications

(9 citation statements)

References 22 publications

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“…This behavior has been found for other oligo(ethylene oxide) surfactants (34) as well as for C 8 to C 18 alkyl chain lengths with the number of EO units ranging from about 3 to 15. However, at a sufficiently high EO content the foamability starts to decrease (34,37). The foamability and foam stability were lower for C 12 E 7 than for C 12 E 5 .…”

Section: Resultsmentioning

confidence: 79%

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Synthesis and surface measurements of surfactants derived from dehydroabietic acid

Piispanen¹,

Kjellin

Hedman³

et al. 2003

J Surfact Deterg

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Dehydroabietates with poly(ethylene oxide) chains of average m = 12, 17, and 45 units [DeHab(E) m ] were synthesized. The adsorption at the liquid-vapor interface was measured, and the adsorbed amount and critical micelle concentrations (CMC) were determined. The foamability, the foam stability, wetting properties, and cloud points, with and without salt content, were studied. The results were compared with common linear alkyl ethoxylates, nonylphenol ethoxylates, and cholesterol ethoxylates. The dehydroabietic acid as hydrophobe was found to result in the same CMC as a linear dodecyl chain. DeHab(E) 45 was found to be insoluble above 400 mg/L, but the surface tensions at lower concentrations were similar to those of the C 11-13 E 38-40 surfactants, which exhibit CMC in aqueous media. The foaming behavior of the DeHab(E) 12 and DeHab(E) 17 surfactants was about the same as for common linear C n E m surfactants. The foamability as well as the foam stability increased with ethylene oxide (EO) chain length. The cloud point was depressed by increased salt concentration and increased with the number of EO units in the head group. The cloud point was significantly lower than for the corresponding surfactant with a dodecyl chain with similar EO chain length. The wetting results, obtained by measuring the contact angle at similar surface tensions, indicate that surfactants of the DeHab(E) m type are more efficient wetting agents than both disaccharide sugar surfactants and C n E m type surfactants.Paper no. S1290 in JSD 6, 125-130 (April 2003).Surfactants derived from natural products, including sugars (1-10) and linear alkyl polyoxyethylene-based surfactants, have been well investigated. On the other hand, there have been relatively few investigations dealing with surfactants based on large natural and rigid skeleton hydrophobes. Recently, sterols (11) and fatty acids (12) have been investigated. Polyoxyethylene-based surfactants using cholesterol (13) and phytosterol (14) have also been investigated. Biological studies of the natural surfactant class of sterolins (15) have been done, but no physicochemical properties have been reported. Surface measurements of a natural saponin, gypsoside (16), and a polyoxyethylene-based rosin acid, dehydroabietic acid (17), also have been carried out.Very little is known about the properties of carbohydrate derivatives of sterols. Such derivatives were, however, recently shown to possess useful synergistic effects in reducing the critical micellar concentration (CMC) of sodium dodecyl sulfate. Furthermore, the derivatives, much like cholesterol, were able to stabilize lipid membranes in liposomes (18).There have been reports of several beneficial biological properties of polyoxyethylene-based sterols. For example, oligo(ethylene oxide)-based phytosterol surfactants have been shown to be both antiprurignous and antiphlogistic, similar to cortisones (19), whereas oligo(ethylene oxide)-based cholesterol and sitosterol surfactants have been shown to lower the uptake of cholesterol when a...

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Section: Resultsmentioning

confidence: 79%

“…The foamability and foam stability were lower for C 12 E 7 than for C 12 E 5 . For a dodecyl hydrophobe, the maximum foaming already is passed when the oxide chain reaches 7 units (37). This demonstrates that the foaming behavior is dependent on the size of the EO group in relation to the size of the hydrophobic group.…”

Section: Resultsmentioning

confidence: 88%

Synthesis and surface measurements of surfactants derived from dehydroabietic acid

Piispanen¹,

Kjellin

Hedman³

et al. 2003

J Surfact Deterg

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“…These aqueous foams are stabilized by sodium dodecyl sulfate (SDS) crystalline particles present at the air–water interface and in the liquid films between bubbles. − The crystals are obtained by adding a large amount of salt. It is important to note here that some papers described aqueous foam stabilization by a fluid lamellar L α phase or by liquid crystals. , The extreme stability of foams made with lamellar phases seems to be primarily due to the high viscosity of the foaming solution which slows down gravity drainage. Surfactant particles have also been described in the literature for their antifoaming effect when they are added to a foam obtained by a different surfactant .…”

Section: Introductionmentioning

confidence: 97%

“…It is important to note here that some papers described aqueous foam stabilization by a fluid lamellar L α phase or by liquid crystals. 13,14 The extreme stability of foams made with lamellar phases seems to be primarily due to the high viscosity of the foaming solution which slows down gravity drainage. Surfactant particles have also been described in the literature for their antifoaming effect when they are added to a foam obtained by a different surfactant.…”

Section: Introductionmentioning

confidence: 99%

Aqueous and Oil Foams Stabilized by Surfactant Crystals: New Concepts and Perspectives

Fameau

Binks

2021

Langmuir

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Surfactant crystals can stabilize liquid foams. The crystals are adsorbed at bubble surfaces, slowing down coarsening and coalescence. Excess crystals in the liquid channels between bubbles arrest drainage, leading to ultrastable foams. The melting of crystals upon raising the temperature allows thermoresponsive foams to be designed. In the case of oil foams, the stabilization by crystals received substantial renewed interest in the last 5 years due to their potential applications, particularly in the food industry. For aqueous foams, several reports exist on foams stabilized by crystals. However, these two kinds of liquid foams possess similarities in terms of stabilization mechanisms and the design of surfactant crystal systems. This field will certainly grow in the coming years, and it will contribute to the engineering of new soft materials not only for food but also for cosmetics, pharmaceuticals, and biomedical applications.

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“…The time associated with the reduction of surface tension by surfactants and their mixtures is of great practical importance in various applications, including the development of therapeutic lung surfactants to treat the respiratory distress syndrome [1,2], 1 ink-jet printing [4], air-assist atomization [5], pesticide sprays [6], film coatings [7,8], and the generation of foams [9][10][11] and emulsions [12]. The dynamic aspects of surface tension are also important in phenomena like interfacial turbulence [13], the Marangoni effect [14], thin-film stability [13], surface rheology [13,15], drop impact [16][17][18][19][20], and the spreading of drops on surfaces [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Short-time behavior of mixed diffusion-barrier controlled adsorption

Moorkanikkara

Blankschtein

2006

Journal of Colloid and Interface Science

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Dynamic surface tensions, foam and the transition from micellar solution to lamellar phase dispersion

Cited by 24 publications

References 22 publications

Synthesis and surface measurements of surfactants derived from dehydroabietic acid

Synthesis and surface measurements of surfactants derived from dehydroabietic acid

Aqueous and Oil Foams Stabilized by Surfactant Crystals: New Concepts and Perspectives

Short-time behavior of mixed diffusion-barrier controlled adsorption

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