Vesicular Phase Behaviour in Ionic Surfactant Systems with Organic Counter-ions

2006 ◽  
Vol 43 (1) ◽  
pp. 28-33 ◽  
Author(s):  
R. Friman ◽  
S. Backlund ◽  
C. V. Teixeira ◽  
M. Linden
Keyword(s):  
Phase Behaviour ◽  
Ionic Surfactant ◽  
Counter Ions ◽  
Surfactant Systems

Study of phase behaviour and ionic effect of green surfactants in MEOR

2018 ◽  
Vol 58 (1) ◽  
pp. 84 ◽  
Author(s):  
Bashirul Haq ◽  
Jishan Liu ◽  
Keyu Liu ◽  
Dhafer Al Shehri
Keyword(s):  
Oil Recovery ◽  
Alkyl Group ◽  
Laboratory Experiments ◽  
Carbon Number ◽  
Vital Role ◽  
Phase Behaviour ◽  
Ionic Surfactant ◽  
Core Flooding ◽  
Surfactant Systems ◽  
Group Carbon

The phase behaviour of surfactant systems is an important characteristic for microbial enhanced oil recovery (MEOR) and is a key method for understanding and predicting the performance of surfactant systems. In addition, ions play a vital role in surfactant chemistry and the ionic effects of green surfactants are not yet well characterised. Green surfactants are biodegradable and environmental friendly and perceived to have great potential for MEOR. This study characterises some green anionic and non-ionic surfactants through phase behaviour study, interfacial tension (IFT) and core flooding experiments. At the same time, the combined effect of the surfactants with alcohols on IFT through laboratory experiments are looked into. Our laboratory experiments have confirmed that the non-ionic surfactant is more active in the reduction of IFT than anionic surfactant. Bio-surfactant is unable to form stable middle phase. Temperature and pressure appear to have little effect on the IFT of non-ionic surfactant. There is no significant reduction in IFT values when the non-ionic surfactant is combined with pentanol in varying concentrations. The role of alkyl group carbon number in non-ionic surfactant was also investigated in this study. It was found that the IFT value decreased by increasing the lower limit alkyl group carbon number.

Phase equilibria of some ionic surfactant systems with divalent counter-ions

1984 ◽  
Vol 11 (3-4) ◽  
pp. 401-408 ◽  
Author(s):  
Ali Khan ◽  
Krister Fontell ◽  
Björn Lindman
Keyword(s):  
Phase Equilibria ◽  
Ionic Surfactant ◽  
Counter Ions ◽  
Surfactant Systems

Disconnected lamellar phases in pseudobinary water–non-ionic surfactant systems: A general phenomenon

2006 ◽  
Vol 300 (1) ◽  
pp. 338-347 ◽  
Author(s):  
Dharmesh Varade ◽  
Hironobu Kunieda ◽  
Reinhard Strey ◽  
Cosima Stubenrauch
Keyword(s):  
Ionic Surfactant ◽  
General Phenomenon ◽  
Lamellar Phases ◽  
Surfactant Systems

scholarly journals A Continuum Model with Differential Evolution on Binary Phase Diagram of Ionic Surfactant Aqueous Solution

2020 ◽  
Author(s):  
YU SHI ◽  
Thomas L. Beck
Keyword(s):  
Phase Diagram ◽  
Free Energy ◽  
Differential Evolution ◽  
Continuum Model ◽  
Binary Phase Diagram ◽  
Cell Model ◽  
Differential Evolution Algorithm ◽  
Ionic Surfactant ◽  
Binary Phase ◽  
Counter Ions

We develop a continuum thermodynamic model basing on the cell model at three perspectives.<br><div><p>First, incorporate the Helfrich free energy as amphiphilic molecules aggregate surface free energy;</p> <p>Second, modify the Poisson-Boltzmann equation by introducing the ion-specic dispersion interaction energy of the counter-ion in aqueous region with the aggregate surface to obtain the concentration distributions of both the surfactant monomer and the counter-ions; <br></p><p>Third, include the temperature dependence of chemical potential for the standard state transition, allowing for calculations on the binary phase diagram of a series of potassium carboxylate as well as of sodium carboxylate soaps. </p><p><br></p><p>The differential evolution algorithm is applied to obtain the global minimum of the required criteria, including the boundary conditions of the electrostatic potential, the optimization of aggregate size with respect to the total free energy and the equilibrium of monomers transferring between the aggregate and aqueous region. The specific-ion effect are presented in the aggregate surface tensions and in the counter-ions distribution within</p> <p>the aqueous regions. The continuum model gives good agreement with the dimension sizes and phase boundaries (lamellar-cylindrical and cylindrical-micellar) which are determined with thermodynamic measurements.</p></div>

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. 

Measurement and modeling of the phase behavior of supercritical carbon dioxide+polydisperse non-ionic surfactant systems

2009 ◽  
Vol 287 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Masashi Haruki ◽  
Yuichi Kaida ◽  
Kazuhiko Matsuura ◽  
Shin-ichi Kihara ◽  
Shigeki Takishima
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Phase Behavior ◽  
Ionic Surfactant ◽  
Surfactant Systems ◽  
Supercritical Carbon
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