NMR Investigation onMelaleuca alternifoliaEssential Oil Dispersed in the Monoolein Aqueous System:  Phase Behavior and Dynamics

Langmuir ◽  
2002 ◽  
Vol 18 (21) ◽  
pp. 7916-7922 ◽  
Author(s):  
Francesca Caboi ◽  
Sergio Murgia ◽  
Maura Monduzzi ◽  
Paolo Lazzari
Keyword(s):  
Phase Behavior ◽  
Aqueous System ◽  
System Phase

Dependence of Bicellar System Phase Behavior and Dynamics on Anionic Lipid Concentration

Langmuir ◽  
2013 ◽  
Vol 29 (11) ◽  
pp. 3688-3699 ◽  
Author(s):  
Lauren MacEachern ◽  
Alexander Sylvester ◽  
Alanna Flynn ◽  
Ashkan Rahmani ◽  
Michael R. Morrow
Keyword(s):  
Phase Behavior ◽  
Lipid Concentration ◽  
Anionic Lipid ◽  
System Phase

The Aerosol OT +n-Butanol +n-Heptane + Water System:  Phase Behavior, Structure Characterization, and Application to Pt70Fe30Nanoparticle Synthesis

Langmuir ◽  
2007 ◽  
Vol 23 (22) ◽  
pp. 11015-11020 ◽  
Author(s):  
Arthur R. Malheiro ◽  
Laudemir C. Varanda ◽  
Joelma Perez ◽  
H. Mercedes Villullas
Keyword(s):  
Phase Behavior ◽  
Water System ◽  
Structure Characterization ◽  
Aerosol Ot ◽  
System Phase

Metal-ligand coordinated Ca(DS)2/C14DMAO/H2O system: Phase behavior and rheological property

2011 ◽  
Vol 54 (3) ◽  
pp. 490-496
Author(s):  
Xiang Li ◽  
HongShan Tian ◽  
Qi Ding ◽  
AiXin Song
Keyword(s):  
Rheological Property ◽  
Phase Behavior ◽  
Metal Ligand ◽  
System Phase

The ascorbyl palmitate–polyethyleneglycol 400–water system phase behavior

2012 ◽  
Vol 89 ◽  
pp. 265-270 ◽  
Author(s):  
Luciano Benedini ◽  
Paula V. Messina ◽  
Santiago D. Palma ◽  
Daniel A. Allemandi ◽  
Pablo C. Schulz
Keyword(s):  
Phase Behavior ◽  
Water System ◽  
Ascorbyl Palmitate ◽  
System Phase

Rate Effects in Tertiary Micellar Flooding of Bradford Crude Oil

1981 ◽  
Vol 21 (04) ◽  
pp. 469-479 ◽  
Author(s):  
M.H.M. Sayyouh ◽  
S.M. Farouq Ali ◽  
C.D. Stahl
Keyword(s):  
Phase Behavior ◽  
Oil Recovery ◽  
Rate Effect ◽  
Mobility Control ◽  
Oil Reservoirs ◽  
Micellar Solutions ◽  
Experimental Conditions ◽  
Flow Rates ◽  
Advance Rate ◽  
System Phase

Abstract Micellar flooding of the tight Pennsylvania oil reservoirs invariably is accompanied by low flood advance rates -on the order of a fraction of 1 ft/D. This investigation, therefore, was devoted to the effect of rate on tertiary oil recovery. The experiments were conducted in 2- and 4-ft-long Berea sandstone cores at rates as low as 0.10 ft/D. All runs were tertiary in nature. The micellar solutions being used in the field tests in Pennsylvania also were used for this research. The majority of the runs were carried out in horizontally positioned cores (although a few runs used vertical cores) to determine if gravity was a factor in the observed effect. It was found that oil recovery decreased with a decrease in the flood advance rate up to a point. Thereafter, it showed a small increase with further decrease in rate. This effect has not been reported by other investigators. The rate effect is discussed and analyzed in terms of the system phase behavior, sulfonate adsorption, dispersion, diffusion, and mobility control. The role of the rate effect on the formation of the stabilized bank also was developed for the experimental conditions involved. The implications of very low rates are discussed in the light of field results. Introduction During recent years, much effort has been devoted to investigations of oil displacement by micellar solutions. This process was proposed and described in detail by Gogarty and Tosch1 and Davis and Jones.2 An analysis of the mechanism of the process is given by Bleakley.3 The micellar solutions are composed primarily of a hydrocarbon, water, a surfactant, and a cosurfactant. Micellar flooding involves sequential injection of a micellar slug, a mobility buffer, and drive water. Since one of the significant characteristics of Pennsylvania oil reservoirs is the low formation permeability, water flood rates in many of these reservoirs are much less than 1 ft/D. Currently, tertiary micellar floods are being conducted in these reservoirs. Thus, it is important to investigate the recovery behavior of micellar displacement at comparable flow rates. Taber et al.4 observed that at both higher and lower rates the displacement of oil and water by an alcohol was efficient. This was confirmed later by Taber and Meyer.5 An increase in micro emulsion displacement efficiency at high rates was observed by Healy et al.6 In our previous work,7 the effect of flood advance rate in micellar/polymer displacement process under a wide variety of conditions was investigated to determine (1) what effect do flow rates have on oil recovery and (2) whether flow rate itself or some other factor, such as gravity segregation, contributes to the observed behavior. Oil recovery was found to be rate dependent under these conditions. One objective of this work is to analyze the effect of flood advance rates in terms of system phase behavior, sulfonate adsorption, mixing mechanism, and mobility control. Another purpose is to understand the effect of rate on the formation of the stabilized oil/water bank and discuss the implications of very low rates.

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.

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