Lyotropic liquid crystalline phases and dispersions in dilute anionic surfactant-alcohol-brine systems. 1. Patterns of phase behavior

Benton, W. J.; Miller, Clarence A.

doi:10.1021/j150642a042

Cited by 91 publications

(38 citation statements)

References 8 publications

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“…Then, using co = 2 we obtain in the high Q limit : da 2 We note that I (Q ) is independent of the interaction parameter È and is proportional to the number of lamellae in the sample (i.e. to d-1), which is indeed expected in the high Q limit, where we expect a free-lamella behaviour.…”

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confidence: 60%

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Dynamics of the undulation mode in swollen lamellar phases

Messager¹,

Bassereau²,

Porte³

1990

J. Phys. France

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Abstract. 2014 We investigate the dynamics of the undulation mode (displacement of wave vector q parallel to the layers) in swollen lamellar phases. We calculate the dispersion equation of this mode for all wave vectors, from small q to high q (compared with the inverse of the layer spacing). We then calculate the static structure factor for scattering wave vectors Q parallel to the layers over the whole Q-range and also the dynamic structure factor at high Q.

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confidence: 60%

“…They can often be swollen by addition of solvent [2], and the smectic period (d) then becomes much larger than the thickness (e) of the bilayers (d » e).…”

mentioning

confidence: 99%

Dynamics of the undulation mode in swollen lamellar phases

Messager¹,

Bassereau²,

Porte³

1990

J. Phys. France

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“…However, the surfactant/brine mixture is still unsuitable for injection if separation into two or more liquid phases occurs near optimal salinity (Benton and Miller, 1983). Even if bulk phase separation does not occur, turbid solutions are sometimes observed.…”

Section: Alcohol-free Surfactant Slugs For Injectionmentioning

confidence: 99%

Recent Advances in Surfactant EOR

Hirasaki

Miller

Puerto

2008

SPE Annual Technical Conference and Exhibition

208

172

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Recent advances in surfactant EOR are reviewed. The addition of alkali to surfactant flooding in the 1980s reduced the amount of surfactant required and the process became known as alkaline surfactant polymer flooding (ASP). It was recently found that the adsorption of anionic surfactants on calcite and dolomite can also be significantly reduced with sodium carbonate as the alkali, thus making the process applicable for carbonate formations. The same chemicals are also capable of altering the wettability of carbonate formations from strongly oil-wet to preferentially water-wet. This wettability alteration in combination with ultralow interfacial tension (IFT) makes it possible to displace oil from preferentially oil-wet carbonate matrix to fractures by oil-water gravity drainage.The alkaline surfactant process co-injects alkali and synthetic surfactant. The alkali generates soap in situ by reaction between the alkali and naphthenic acids in the crude oil. It was recently recognized that the local ratio of soap/surfactant determines the local optimal salinity for minimum IFT. Recognition of this dependence makes it possible to design a strategy to maximize oil recovery with the least amount of surfactant and inject polymer with the surfactant without phase separation. An additional benefit of the presence of the soap component is that it generates an oil-rich colloidal dispersion which produces ultra-low IFT over a much wider range of salinity than in its absence.It was once thought that a co-solvent such as alcohol was necessary to make a microemulsion without gel-like phases or a polymer-rich phase separating from the surfactant solution. An example of an alternative to the use of alcohol is to blend two dissimilar surfactants, a branched alkoxylated sulfate and a double-tailed, internal olefin sulfonate. The single phase region with NaCl or CaCl 2 is greater for the blend than for either surfactant alone. It is also possible to incorporate polymer into such aqueous surfactant solutions without phase separation under some conditions. The injected surfactant solution has under-optimum phase behavior with the crude oil. It becomes optimum only as it mixes with the in situ generated soap, which is generally more hydrophobic than the injected surfactant. However, some crude oils do not have a sufficiently high acid number for this approach to work.Foam can be used for mobility control by alternating slugs of gas with slugs of surfactant solution. Besides effective oil displacement in a homogeneous sandpack, it demonstrated greatly improved sweep in a layered sandpack. 2 [SPE 115386]

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“…The average periodicity of these LLC phases is found to vary over a wide range with composition. A number of examples are found where an LLC with initially symmetrical hydrophilic and hydrophobic parts can be swollen by water (or brine) [1][2][3][4][5] or by oil [6][7][8][9]. In the resulting phase thin hydrophobic/hydrophilic layers are separated by thick water/oil layers.…”

Section: Introductionmentioning

confidence: 99%

Extreme swelling of a lyotropic lamellar liquid crystal

Appell

Bassereau

Marignan

et al. 1989

Colloid & Polymer Sci

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The evolution of the OBS/water/decane/pentanol lyotropic lamellar crystal is followed from 0 % to more than 90 % decane content. The lamellar spacing (d) varies then from 35 A to 11000 A. The swelling is followed with small angle x-ray scattering and the Bragg divergence in the intensi~ is found to disappear in moderately swollen lamellar crystal (d from 200 A up to 800 A) while the central scattering increases. More striking is the reappearance of the Bragg divergences observed by SAXS (d from 800 A to 1100 ~) and for extremely swollen lamellar crystals in the angular distribution of scattered light (d from 2 000 A to 10 000 A). We discuss these observations along the lines of the recent models of swollen lamellar liquid crystals and in particular the apparent evolution of the dilute lamellae.

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Lyotropic liquid crystalline phases and dispersions in dilute anionic surfactant-alcohol-brine systems. 1. Patterns of phase behavior

Cited by 91 publications

References 8 publications

Dynamics of the undulation mode in swollen lamellar phases

Dynamics of the undulation mode in swollen lamellar phases

Recent Advances in Surfactant EOR

Extreme swelling of a lyotropic lamellar liquid crystal

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