Phase behavior of cationic and anionic surfactants at low concentrations

1992 ◽  
Vol 50 (1) ◽  
pp. 694-695
Author(s):  
E. Naranjo
Keyword(s):  
Phase Behavior ◽  
Structural Characterization ◽  
Dynamic Systems ◽  
Anionic Surfactants ◽  
Intermolecular Forces ◽  
Stable Form ◽  
Surfactant Mixtures ◽  
Low Concentrations ◽  
Cationic And Anionic Surfactants ◽  
General Method

Equilibrium vesicles, those which are the stable form of aggregation and form spontaneously on mixing surfactant with water, have never been demonstrated in single component bilayers and only rarely in lipid or surfactant mixtures. Designing a simple and general method for producing spontaneous and stable vesicles depends on a better understanding of the thermodynamics of aggregation, the interplay of intermolecular forces in surfactants, and an efficient way of doing structural characterization in dynamic systems.

Phase behavior in mixtures of cationic and anionic surfactants in aqueous solutions

1995 ◽  
Vol 273 (2) ◽  
pp. 182-188 ◽  
Author(s):  
N. Filipović-Vinceković ◽  
M. Bujan ◽  
Đ. Dragčević ◽  
N. Nekić
Keyword(s):  
Aqueous Solutions ◽  
Phase Behavior ◽  
Anionic Surfactants ◽  
Cationic And Anionic Surfactants

Phase Behavior and Microstructure in Aqueous Mixtures of Cationic and Anionic Surfactants

ChemInform ◽  
2006 ◽  
Vol 37 (13) ◽  
Author(s):  
Eric W. Kaler ◽  
Kathi L. Herrington ◽  
Daniel J. Iampietro ◽  
Bret A. Coldren ◽  
Hee-Tae Jung ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Anionic Surfactants ◽  
Aqueous Mixtures ◽  
Cationic And Anionic Surfactants

Adsorption of cationic and anionic surfactants on natural and synthetic carbonate materials

2013 ◽  
Vol 408 ◽  
pp. 164-172 ◽  
Author(s):  
Kun Ma ◽  
Leyu Cui ◽  
Yezi Dong ◽  
Tianlong Wang ◽  
Chang Da ◽  
...  
Keyword(s):  
Anionic Surfactants ◽  
Cationic And Anionic Surfactants ◽  
Carbonate Materials ◽  
Natural And Synthetic

Reduction of Surfactant Retention in Limestones Using Sodium Hydroxide

SPE Journal ◽  
2018 ◽  
Vol 24 (01) ◽  
pp. 92-115 ◽  
Author(s):  
D.. Wang ◽  
M.. Maubert ◽  
G. A. Pope ◽  
P. J. Liyanage ◽  
S. H. Jang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Sodium Hydroxide ◽  
Anionic Surfactants ◽  
Geochemical Modeling ◽  
Low Molecular Weight ◽  
Low Concentrations ◽  
Reservoir Conditions ◽  
Negative Surface ◽  
Negative Surface Charge ◽  
Indiana Limestone

Summary Geochemical modeling was used to design and conduct a series of alkaline/surfactant/polymer (ASP) coreflood experiments to measure the surfactant retention in limestone cores using sodium hydroxide (NaOH) as the alkali. Surfactant/polymer (SP) coreflood experiments were conducted under the same conditions for comparison. NaOH has been used for ASP floods of sandstones, but these are the first experiments to test it for ASP floods of limestones. Two studies performed under different reservoir conditions showed that NaOH significantly reduced the surfactant retention in Indiana Limestone. An ASP solution with 0.3 wt% NaOH has a pH of approximately 12.6 at 25°C. The high pH increases the negative surface charge of the carbonate, which favors lower adsorption of anionic surfactants. Another advantage of NaOH is that low concentrations of only approximately 0.3 wt% can be used because of its low molecular weight and its low consumption in limestones. Most reservoir carbonates contain gypsum or anhydrite, and therefore sodium carbonate (Na2CO3) will be consumed by the precipitation of calcium carbonate (CaCO3). As shown in the two studies, NaOH can be used in limestone reservoirs containing gypsum or anhydrite.

Temperature-Dependent Vesicle Formation of Aqueous Solutions of Mixed Cationic and Anionic Surfactants

Langmuir ◽  
2004 ◽  
Vol 20 (6) ◽  
pp. 2117-2122 ◽  
Author(s):  
Koji Tsuchiya ◽  
Hisanori Nakanishi ◽  
Hideki Sakai ◽  
Masahiko Abe
Keyword(s):  
Aqueous Solutions ◽  
Anionic Surfactants ◽  
Vesicle Formation ◽  
Temperature Dependent ◽  
Cationic And Anionic Surfactants
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