Comments on some dynamic surface tension measurements by the dynamic bubble pressure method

Joos, P.; Fang, Jiping; Serrien, G

doi:10.1016/0021-9797(92)90245-h

Cited by 62 publications

(24 citation statements)

References 9 publications

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“…Figure 8 shows that in both systems, the is using a long-time adsorption equation. Joos et al (12) values of this ratio show little increase with relatively large showed that for long-time diffusion-controlled adsorption increase in the surfactant bulk concentration. the following equation can be used:…”

Section: Fig 6 Dynamic Surface Tension (G T ) Vs Tmentioning

confidence: 93%

Dynamic Surface Tension of Aqueous Surfactant Solutions 8. Effect of Spacer on Dynamic Properties of Gemini Surfactant Solutions

Rosen¹,

Song²

1996

Journal of Colloid and Interface Science

153

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Section: Fig 6 Dynamic Surface Tension (G T ) Vs Tmentioning

confidence: 93%

Dynamic Surface Tension of Aqueous Surfactant Solutions 8. Effect of Spacer on Dynamic Properties of Gemini Surfactant Solutions

Rosen¹,

Song²

1996

Journal of Colloid and Interface Science

153

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“…(2.14) of Sec. 2, expand it close to equilibrium and find the time scale, 25) where τ (0) k denotes the kinetic time scale found in the absence of electrostatics [Eq. (2.17)].…”

Section: Limiting Cases For the Adsorptionmentioning

confidence: 99%

Kinetics of Surfactant Adsorption at Fluid−Fluid Interfaces

1996

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We present a theory for the kinetics of surfactant adsorption at the interface between an aqueous solution and another fluid (air, oil) phase. The model relies on a free-energy formulation. It describes both the diffusive transport of surfactant molecules from the bulk solution to the interface, and the kinetics taking place at the interface itself. When applied to non-ionic surfactant systems, the theory recovers results of previous models, justify their assumptions and predicts a diffusion-limited adsorption, in accord with experiments. For salt-free ionic surfactant solutions, electrostatic interactions are shown to drastically affect the kinetics. The adsorption in this case is predicted to be kinetically limited, and the theory accounts for unusual experimental results obtained recently for the dynamic surface tension of such systems. Addition of salt to an ionic surfactant solution leads to screening of the electrostatic interactions and to a diffusion-limited adsorption. In addition, the free-energy formulation offers a general method for relating the dynamic surface tension to surface coverage. Unlike previous models, it does not rely on equilibrium relations which are shown in some cases to be invalid out of equilibrium.

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“…OJPC from the Lagmuir-Frumkin equatio (7) Equation (7) does not include a pr (8) That can be expressed as series expansi n;…”

Section: Resultsmentioning

confidence: 99%

“…Surface tension methods A dynamic method for surface tension was chosen, the maximum bubble pressure method displayes surface tension based on instantaneous bubble formation [6][7][8]. This is a dynamic method selected for surface tension measurements due to polyurethane foam formulation taking seconds during its production.…”

Section: Introductionmentioning

confidence: 99%

Surface Tension and Foam Stability Prediction of Polydimethylsiloxane-Polyol Systems

Saavedra¹,

Gracia-Fadrique²

2012

OJPC

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The Gibbs elasticity modulus represents an important tool to predict the foamability for transient and permanent foams like polyurethane flexible systems. Elasticity is related to foamability and so is used as a synonymous for the purpose of this paper. In this article we propose a method and a thermodynamic model to analyze the espumability of silicone surfactants in polyol binary mixtures using surface tension data. The present work describes foamability through the Gibbs elasticity modulus expressed in terms of first and second derivatives of surface pressure vs bulk composition. Furthermore, the Gibbs adsorption equation and the corresponding novel surface equation of state based on a modification of the Langmuir isotherm resulted in an elasticity equation with analytical solution. It is shown that according to foam model systems of surfactant solution in polyol used at commercial processes, optimum concentration level of surfactant obtained at this article by Gibbs adsorption equation and maximus on elasticity modulus finally match.

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Comments on some dynamic surface tension measurements by the dynamic bubble pressure method

Cited by 62 publications

References 9 publications

Dynamic Surface Tension of Aqueous Surfactant Solutions 8. Effect of Spacer on Dynamic Properties of Gemini Surfactant Solutions

Dynamic Surface Tension of Aqueous Surfactant Solutions 8. Effect of Spacer on Dynamic Properties of Gemini Surfactant Solutions

Kinetics of Surfactant Adsorption at Fluid−Fluid Interfaces

Surface Tension and Foam Stability Prediction of Polydimethylsiloxane-Polyol Systems

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