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

2020 ◽  
Vol 4 (4) ◽  
pp. 53
Author(s):  
Dimi Arabadzhieva ◽  
Plamen Tchoukov ◽  
Elena Mileva
Keyword(s):  
Surface Tension ◽  
Adsorption Layer ◽  
Thin Liquid Film ◽  
Fine Tuning ◽  
Molar Ratio ◽  
Clear Correlation ◽  
Surfactant Mixtures ◽  
Foam Films ◽  
Foam Film ◽  
Surfactant Systems

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.

scholarly journals Effect of surfactant redistribution on the flow and stability of foam films

2020 ◽  
Vol 476 (2234) ◽  
pp. 20190637
Author(s):  
Denny Vitasari ◽  
Simon Cox ◽  
Paul Grassia ◽  
Ruben Rosario
Keyword(s):  
Surface Tension ◽  
Channel Wall ◽  
Foam Stability ◽  
Intermediate Regime ◽  
Foam Films ◽  
Foam Film ◽  
Tension Increase ◽  
Constricted Channel ◽  
Film Tension ◽  
Foam Rheology

The viscous froth model for two-dimensional (2D) dissipative foam rheology is combined with Marangoni-driven surfactant redistribution on a foam film. The model is used to study the flow of a 2D foam system consisting of one bubble partially filling a constricted channel and a single spanning film connecting it to the opposite channel wall. Gradients of surface tension arising from film deformation induce tangential flow that redistributes surfactant along the film. This redistribution, and the consequent changes in film tension, inhibit the structure from undergoing a foam-destroying topological change in which the spanning film leaves the bubble behind; foam stability is thereby increased. The system’s behaviour is categorized by a Gibbs–Marangoni parameter, representing the ratio between the rate of motion in tangential and normal directions. Larger values of the Gibbs–Marangoni parameter induce greater variation in surface tension, increase the rate of surfactant redistribution and reduce the likelihood of topological changes. An intermediate regime is, however, identified in which the Gibbs–Marangoni parameter is large enough to create a significant gradient of surface tension but is not great enough to smooth out the flow-induced redistribution of surfactant entirely, resulting in non-monotonic variation in the bubble height, and hence in foam stability.

scholarly journals Surface adsorption of sulfonated poly(phenylene sulfone)/C14TAB mixtures and its correlation with foam film stability

2016 ◽  
Vol 18 (27) ◽  
pp. 18414-18423 ◽  
Author(s):  
Martin Uhlig ◽  
Reinhard Miller ◽  
Regine von Klitzing
Keyword(s):  
Surface Tension ◽  
Surface Elasticity ◽  
Surface Adsorption ◽  
Surfactant Mixtures ◽  
Film Stability ◽  
Foam Film ◽  
Stability Measurements ◽  
Sulfonated Poly

Polyelectrolyte/surfactant mixtures of rigid monosulfonated poly(phenylene sulfone) (sPSO2-220) and tetradecyl trimethylammonium bromide (C14TAB) were investigated by surface tension, surface elasticity and foam film stability measurements.

Phase behavior of polymer-surfactant systems in relation to polymer-polymer and surfactant-surfactant mixtures

1993 ◽  
Vol 65 (5) ◽  
pp. 953-958 ◽  
Author(s):  
B. Lindman ◽  
Ali Khan ◽  
E. Marques ◽  
M. Graca da Miguel ◽  
L. Piculell ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Surfactant Mixtures ◽  
Surfactant Systems ◽  
Polymer Surfactant

Deformation characteristics of ultra-thin liquid film considering temperature and film thickness dependence of surface tension

2011 ◽  
Vol 17 (5-7) ◽  
pp. 983-990 ◽  
Author(s):  
Hiroshige Matsuoka ◽  
Koji Oka ◽  
Yusuke Yamashita ◽  
Fumihiro Saeki ◽  
Shigehisa Fukui
Keyword(s):  
Surface Tension ◽  
Film Thickness ◽  
Liquid Film ◽  
Thin Liquid Film ◽  
Thickness Dependence ◽  
Deformation Characteristics

Adsorption layer and foam film properties of mixed solutions containing β-casein and C12DMPO

2009 ◽  
Vol 23 (4) ◽  
pp. 1169-1176 ◽  
Author(s):  
Cs. Kotsmar ◽  
D. Arabadzhieva ◽  
Khr. Khristov ◽  
E. Mileva ◽  
D.O. Grigoriev ◽  
...  
Keyword(s):  
Adsorption Layer ◽  
Film Properties ◽  
Mixed Solutions ◽  
Foam Film

scholarly journals On the origin of the circular hydraulic jump in a thin liquid film

2018 ◽  
Vol 851 ◽  
Author(s):  
Rajesh K. Bhagat ◽  
N. K. Jha ◽  
P. F. Linden ◽  
D. Ian Wilson
Keyword(s):  
Thin Film ◽  
Surface Tension ◽  
Liquid Film ◽  
Thin Liquid Film ◽  
Capillary Waves ◽  
Hydraulic Jumps ◽  
Planar Surface ◽  
Normal Impact ◽  
Viscous Forces

This study explores the formation of circular thin-film hydraulic jumps caused by the normal impact of a jet on an infinite planar surface. For more than a century, it has been believed that all hydraulic jumps are created due to gravity. However, we show that these thin-film hydraulic jumps result from energy loss due to surface tension and viscous forces alone. We show that, at the jump, surface tension and viscous forces balance the momentum in the liquid film and gravity plays no significant role. Experiments show no dependence on the orientation of the surface and a scaling relation balancing viscous forces and surface tension collapses the experimental data. A theoretical analysis shows that the downstream transport of surface energy is the previously neglected critical ingredient in these flows, and that capillary waves play the role of gravity waves in a traditional jump in demarcating the transition from the supercritical to subcritical flow associated with these jumps.

Foam Films from Oppositely Charged Polyelectolyte/Surfactant Mixtures: Effect of Polyelectrolyte and Surfactant Hydrophobicity on Film Stability

Langmuir ◽  
2010 ◽  
Vol 26 (12) ◽  
pp. 9321-9327 ◽  
Author(s):  
Nora Kristen ◽  
Andrea Vüllings ◽  
André Laschewsky ◽  
Reinhard Miller ◽  
Regine von Klitzing
Keyword(s):  
Surfactant Mixtures ◽  
Film Stability ◽  
Foam Films ◽  
Oppositely Charged

Macroscopic Modeling of the Surface Tension of Polymer−Surfactant Systems

Langmuir ◽  
2007 ◽  
Vol 23 (11) ◽  
pp. 6042-6052 ◽  
Author(s):  
Christopher G. Bell ◽  
Christopher J. W. Breward ◽  
Peter D. Howell ◽  
Jeffery Penfold ◽  
Robert K. Thomas
Keyword(s):  
Surface Tension ◽  
Macroscopic Modeling ◽  
Surfactant Systems ◽  
Polymer Surfactant

scholarly journals Holes and cracks in rigid foam films

2015 ◽  
Vol 774 ◽  
Author(s):  
P. C. Petit ◽  
M. Le Merrer ◽  
A.-L. Biance
Keyword(s):  
Active Material ◽  
Surface Elasticity ◽  
Classical Problem ◽  
Film Rupture ◽  
Rigid Foam ◽  
Foam Films ◽  
Rupture Dynamics ◽  
Foam Film ◽  
Surface Active Material

The classical problem of foam film rupture dynamics has been investigated when the film interfaces exhibit very high rigidity due to the presence of specific surfactants. Two new features are reported. First, a strong deviation from the well-known Taylor–Culick law is observed. Second, crack-like patterns can be visualized in the film; these patterns are shown to appear at a well-defined film shrinkage. The key role of surface-active material on these features is quantitatively investigated, pointing to the importance of surface elasticity to describe these fast dynamical processes and thus providing an alternative tool to characterize surface elasticity in conditions extremely far from equilibrium. The origin of the cracks and their consequences on film rupturing dynamics are also discussed.

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