Micellization and Phase Behavior of Binary Mixtures of Anionic and Nonionic Surfactants in Aqueous Media

2012 ◽  
Vol 51 (8) ◽  
pp. 3338-3349 ◽  
Author(s):  
Rakesh Kumar Mahajan ◽  
Durgesh Nandni
Keyword(s):  
Phase Behavior ◽  
Binary Mixtures ◽  
Nonionic Surfactants ◽  
Aqueous Media

Phase behavior of binary mixtures of sterically stabilized colloids with large size asymmetry

2004 ◽  
Vol 120 (2) ◽  
pp. 1097-1104 ◽  
Author(s):  
Yves Hennequin ◽  
Michael Pollard ◽  
Jeroen S. van Duijneveldt
Keyword(s):  
Phase Behavior ◽  
Binary Mixtures ◽  
Large Size ◽  
Size Asymmetry

Adsolubilization of 2-Naphthol by Binary Mixtures of Cationic and Nonionic Surfactants on Silica

Langmuir ◽  
2001 ◽  
Vol 17 (23) ◽  
pp. 7350-7354 ◽  
Author(s):  
Kunio Esumi ◽  
Noriko Maedomari ◽  
Kanjiro Torigoe
Keyword(s):  
Binary Mixtures ◽  
Nonionic Surfactants

The Effect of Several Polymers on the Phase Behavior of Micellar Fluids

1982 ◽  
Vol 22 (06) ◽  
pp. 816-830 ◽  
Author(s):  
Gary A. Pope ◽  
Kerming Tsaur ◽  
Robert S. Schechter ◽  
Ben Wang
Keyword(s):  
Phase Behavior ◽  
Nonionic Surfactants ◽  
Polymer Concentration ◽  
Salinity Range ◽  
Lower Phase ◽  
Optimal Salinity ◽  
Rich Phase ◽  
Three Phase ◽  
Phase Systems ◽  
Increasing Temperature

Abstract We made static measurements of the phase volumes of mixtures of surfactant, polymer, alcohol, water, oil, sodium chloride, and in some cases polymer additives. We also made a limited number of viscosity, phase concentration, and interfacial tension (IFT) measurements. The purpose was to determine systematically the effect of various polymers on the phase behavior of various surfactant formulations. We made measurements with and without oil (n-octane and n-octane/benzene mixtures) across a range of salinity appropriate to the particular surfactant at temperatures between 24 and 75 degrees C. Introduction The oil-free (i.e., no added oil) solutions showed a characteristic phase separation into an aqueous surfactant-rich phase and an aqueous polymer-rich phase at some sufficiently high salinity (NaCl concentration), which we call the critical electrolyte concentration (CEC). The CEC was found to be a characteristic of a given surfactant/alcohol combination that shifts with the solubility of the surfactant qualitatively the same way as does the optimal salinity: but the CEC was found independent of the polymer type, polymer concentration (between the 100- and 1,000-ppm limits investigated), and surfactant concentration. The CEC increases with increasing temperature for the anionic surfactants and decreases with increasing temperature for the nonionic surfactants. When oil was added to the mixtures, an entirely different pattern of phase behavior was observed. As salinity increases, the particular formulations form the typical sequence of lower-phase microemulsion and excess oil, middle-phase microemulsion. excess oil, and excess brine: and upper-phase microemulsion and excess brine. The sequence with polymer was precisely the same over most of the salinity range but deviated over a limited range of salinity; the three-phase region simply shifted a small distance to the left on the salinity scale. Also, and probably more significantly, some of the aqueous phases in the critical region of the shift (which is also just above oil-free CEC salinity) were found to be gel-like in nature. These apparently occur under conditions such that the polymer concentration in the excess brine of the three-phase systems becomes very high because almost all the polymer is always in the brine phase, even when the brine phase is very small. Thus an overall 1,000 ppm of polymer easily can be concentrated to 10,000 ppm or more. One of the most remarkable aspects of the phase behavior of the surfactant/polymer systems is that the same patterns are observed for all combinations of anionic and nonionic surfactants and polymers. Also, little difference was observed in the IFT values with and without polymer. The three-phase systems still exhibited ultralow IFT values. Obviously, significant differences did occur in the brine viscosities when polymer was added. The polymer-free mixtures were themselves quite viscous, however, and the viscosity of the oil-free surfactant-rich phases (above the CEC) was significantly higher when the phases were in equilibrium with a polymer-rich aqueous phase, even though they apparently contained almost no polymer. We found that the polymer-rich phases had normal viscosities, as judged by the same polymer in the same brine at the expected concentration, assuming all the polymer was in the polymer-rich phase. The effect of polymer on the systems with oil was to increase the viscosity of the water-rich phase only, with little effect on the microemulsion phase unless it was the water-rich phase. SPEJ P. 816^

scholarly journals Phase Behavior of Engkabang Fat with Nonionic Surfactants

2009 ◽  
Vol 46 (4) ◽  
pp. 195-198 ◽  
Author(s):  
S. S. A. Gani ◽  
M. Basri ◽  
M. B. A. Rahman ◽  
A. Kassim ◽  
A. B. Salleh ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Nonionic Surfactants

Order−Disorder Transition, Microdomain Structure, and Phase Behavior in Binary Mixtures of Low Molecular Weight Polystyrene-block-polyisoprene Copolymers

1997 ◽  
Vol 30 (19) ◽  
pp. 5832-5842 ◽  
Author(s):  
Daisuke Yamaguchi ◽  
Takeji Hashimoto ◽  
Chang Dae Han ◽  
Deog Man Baek ◽  
Jin Kon Kim ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Phase Behavior ◽  
Binary Mixtures ◽  
Low Molecular Weight ◽  
Disorder Transition ◽  
Microdomain Structure

Thermodynamic and Kinetic Study on Phase Behavior of Binary Mixtures of POP and PPO Forming Molecular Compound Systems

1997 ◽  
Vol 101 (18) ◽  
pp. 3498-3505 ◽  
Author(s):  
A. Minato ◽  
S. Ueno ◽  
K. Smith ◽  
Y. Amemiya ◽  
K. Sato
Keyword(s):  
Kinetic Study ◽  
Phase Behavior ◽  
Binary Mixtures ◽  
Molecular Compound

Effect of water content on structural and phase behavior of water-in-oil (n-decane) microemulsion system stabilized by mixed nonionic surfactants SPAN 80/TWEEN 80

2017 ◽  
Vol 518 ◽  
pp. 273-282 ◽  
Author(s):  
A.S. Koneva ◽  
E.A. Safonova ◽  
P.S. Kondrakhina ◽  
M.A. Vovk ◽  
A.A. Lezov ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Water Content ◽  
Nonionic Surfactants ◽  
Tween 80 ◽  
Microemulsion System ◽  
Effect Of Water ◽  
Span 80
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