Role of Surface Forces in the Stability of Evaporating Thin Liquid Films That Contain Surfactant Micelles

1998 ◽  
Vol 198 (2) ◽  
pp. 224-240 ◽  
Author(s):  
Theodor Gurkov ◽  
Krassimir Danov ◽  
Norbert Alleborn ◽  
Hans Raszillier ◽  
Franz Durst
Keyword(s):  
Liquid Films ◽  
Surface Forces ◽  
Thin Liquid Films ◽  
Surfactant Micelles ◽  
The Stability

Film Elasticity and Film Stabilization in Firefighting Foam Stabilized by Solid Particles

2017 ◽  
Vol 744 ◽  
pp. 346-349
Author(s):  
Xiu Juan Li ◽  
Rui Song Guo ◽  
Min Zhao
Keyword(s):  
Life Time ◽  
Liquid Films ◽  
Thin Liquid Films ◽  
Solid Particles ◽  
High Concentration ◽  
Hydration Effect ◽  
Fixed Area ◽  
The Stability ◽  
Hydration Layers ◽  
Hydration Forces

The structure of the thin liquid films determines the stability of foams and emulsions. In this work the bubbles stretched length with different hollow SiO2 particles concentration is measured when the foam has been stilled for different time. The results show that the bubbles stretched length is longer than that of bubbles when the foam is free of hollow SiO2 particles even when the foam has been stilled for 500mins. The bubbles stretched length increases with increasing the concentration of hollow SiO2 particles. A strong hydration effect leaves a large volume of hydration layers on the solid particles surfaces in aqueous solutions. The water in hydration layers can help the film keep a certain thickness. The existence of hydration forces leads that two particles cannot be too close each other. The high concentration surfactant limited in the fixed area helps the film keep good elasticity. Therefore the film has a long life time with compatible thickness and elasticity and the three-phrase foam is upper stable.

Statistics of rupture in relation to the stability of thin liquid films with different size

2011 ◽  
Vol 382 (1-3) ◽  
pp. 174-180 ◽  
Author(s):  
Theodor D. Gurkov ◽  
Jana K. Angarska ◽  
Krassimir D. Tachev ◽  
Wolfgang Gaschler
Keyword(s):  
Liquid Films ◽  
Thin Liquid Films ◽  
The Stability

RUBBER CONTACT PHENOMENA

2014 ◽  
Vol 87 (3) ◽  
pp. 383-416 ◽  
Author(s):  
Alan D. Roberts
Keyword(s):  
Salt Concentration ◽  
Friction Mechanisms ◽  
Sliding Friction ◽  
Liquid Films ◽  
Surface Forces ◽  
Thin Liquid Films ◽  
Water Films ◽  
Insight Into ◽  
Design Guidance ◽  
Strength Of Adhesion

ABSTRACT Research on rubber wiper blades led to the establishment of the now widely used Johnson, Kendall, Roberts (JKR) equilibrium equation that determines the strength of adhesion between surfaces. The equation was adapted to allow for the viscoelasticity of rubber, leading to explanations of how adhesion can impact on tack; rebound resilience; and rolling, static, and sliding friction. The adhesion of rubber to ice was found to depend on salt concentration in the ice, thus providing insight into winter tire performance. The development of optical techniques has greatly aided studies, particularly for measuring the thickness of thin liquid films sandwiched between rubber surfaces. Measurements on water films squeezed between rubber and glass revealed the action of repulsive surface forces that can reduce adhesion and friction. The efficacy of water lubrication depends upon whether surfactants are present and upon the acidity or alkalinity of the water. Improved understanding of adhesion and friction mechanisms offers design guidance for a range of rubber articles.

A Study of Thin Liquid Films as Related to the Stability of Crude Oil Emulsions

2001 ◽  
Vol 238 (1) ◽  
pp. 177-182 ◽  
Author(s):  
Hongbo Fang ◽  
Lu Zhang ◽  
Lan Luo ◽  
Sui Zhao ◽  
Jingyi An ◽  
...  
Keyword(s):  
Crude Oil ◽  
Liquid Films ◽  
Thin Liquid Films ◽  
Oil Emulsions ◽  
The Stability

Transport Properties of Polyelectrolyte Solutions. Effect of Confinement in Thin Liquid Films

2015 ◽  
Vol 229 (7-8) ◽  
Author(s):  
Jérôme Delacotte ◽  
Dominique Langevin
Keyword(s):  
Thin Films ◽  
Electrical Conductivity ◽  
Transport Properties ◽  
Liquid Films ◽  
Thin Liquid Films ◽  
Conductivity Measurements ◽  
Polyelectrolyte Solutions

AbstractThe role of condensed counterions in transport properties, such as electrical conductivity and viscosity, has been investigated with solutions of a flexible polyelectrolyte. Comparisons with existing theories are proposed. Viscosity is strongly affected by confinement in thin films, depending whether polyelectrolyte chains are adsorbed or not at the film surfaces. The role of counterion mobility is however difficult to assess because the measurements are not accurate enough. It is proposed that this role could be tested by electrical conductivity measurements.

scholarly journals Ion-Specific Effects on Equilibrium Adsorption Layers of Ionic Surfactants

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
Stoyan I. Karakashev
Keyword(s):  
Experimental Validation ◽  
Adsorption Layer ◽  
Liquid Films ◽  
Thin Liquid Films ◽  
Ionic Surfactant ◽  
Surfactant Adsorption ◽  
Specific Effects ◽  
Counter Ions ◽  
The Stability ◽  
Adsorption Layers

This review article reports on the effect of the counter-ions on the ionic surfactant adsorption layer and its relation to the stability of foams and emulsions. The adsorption theory of Davies about the ionic surfactant monolayer was revisited and it is shown how to account for the type of the counter-ions. The experimental validation of this theory on thin liquid films was shown as well, thus explaining the effect of Hofmeister. However their effect on foams and emulsions is more complex. Furthermore, it is shown how the counter-ions affect in complex way the stability of foams and emulsions via the surfactant adsorption layer in the light of the newest theory. To elucidate the nature of this effect further investigation is called for. 

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