Effects of the molecular structure of the interface and continuous phase on solubilization of water in water/oil microemulsions

Hou, M.J; Shah, Dinesh O.

doi:10.1021/la00078a036

Cited by 217 publications

(211 citation statements)

References 7 publications

(11 reference statements)

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“…Theoretical calculations suggest (18) that the greater contributions to droplet-droplet attractive interactions occur in the overlapping region, a phenomenological parameter ξ being frequently used to characterize the depth of interpenetration between droplets. The value of ξ should decrease as the interface becomes stiffer and increase along with increasing salinity (19).…”

Section: Discussionmentioning

confidence: 99%

Effects of Alkylamines on the Percolation Phenomena in Water/AOT/Isooctane Microemulsions

García‐Río

Hervés

Mejuto

et al. 2000

Journal of Colloid and Interface Science

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Section: Discussionmentioning

confidence: 99%

Effects of Alkylamines on the Percolation Phenomena in Water/AOT/Isooctane Microemulsions

García‐Río

Hervés

Mejuto

et al. 2000

Journal of Colloid and Interface Science

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“…As a development of our previous studies, in this paper we report an IR investigation on the structure of water in w a t e r / A O T / n -h e p t a n e reverse micelles. The water binding capacity of AOT in n-heptane is higher than in CC14 [11], so differences in the filling mechanism of AOT reverse micelles could be expected in the two solvents.…”

mentioning

confidence: 99%

Structure of water-in-oil microemulsions of AOT by infrared spectroscopy

1994

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(ricevuto il 28 Ottobre 1994)Summary. --The structure of water in water/AOT/n-heptane reverse micelles has been studied as a function of the [H20]/[AOT] ratio (W) by using the absorption IR due to O--H stretching modes in the 3800-3000 cm-1 range. The results show that the IR spectra can be expressed as a sum of contributions from bound-and bulk-like water. The fraction of water in the two ~,regions-within the water pool was evaluated as a function of W. The ,(bound), water region seems to hold 3.5 water molecules (corresponding to 7 0 --H oscillators) per AOT molecule and its formation is nearly complete at W > 6. PACS 31.25 -Electron correlation calculations for atoms and molecules. PACS 01.30.Cc -Conference proceedings. -I n t r o d u c t i o n .The surfactant sodium bis(2-ethyl-hexyl)sulfosuccinate (AOT) is known to form spherical, nanometer sized, molecular aggregates in a variety of non-polar organic solvents. These are often referred to as reverse micelles. The hydrocarbon tails of the AOT molecules are oriented toward the exterior of the aggregate and the sulphonate head groups, with the sodium counterions being localized in the interior of the aggregate. Of particular interest is the ability of AOT reverse micelles to solubilize relatively large amounts of water in this polar core forming a so-called ,,water-pooN. This offers a unique opportunity to study the properties of water aggregates close to the ionic centres (head polar groups and the corresponding counterions of the surfactant) without the interference due to large quantities of bulk water.Although most of the properties of water in reverse AOT micelles have been closely investigated [1][2][3], little attention has been paid to their spectra of vibrational bands [4][5][6][7][8][9][10]. In previous papers the use of infrared spectroscopy as a sensitive tool for the study of water into AOT reverse micelles has been described [6][7][8]. Infrared

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“…Also, the presence of additives such as alcohols (cosurfactants) at the interfacial surfactant film can reduce tail-tail, and thus micelle-micelle, interactions (McFann, et al, 1994). A similar effect is expected with bulkier, more branched surfactant tails (Hou, et al, 1987, Huang, et al, 1984, McFann, et al, 1994, as illustrated in Figure 2. The addition of salt can also reduce intramicellar head-group repulsion (Aveyard, et al, 1986) in a way that tail penetration between interacting droplets is reduced due to greater steric hindrance in the interfacial region.…”

Section: Microemulsion Stabilitymentioning

confidence: 62%

“…Instability in water-in-oil (W/O) microemulsions, as indicated by phase separation, can be induced by (1) curvature or (2) attractive droplet interactions (Hou, et al, 1987). Curvature effects arise due to the difference in surfactant head group -head group, and tail-tail interactions, which are mediated by the environment in which they are solvated (Israelachvili, 1994, Israelachvili, 1997.…”

Section: Microemulsion Stabilitymentioning

confidence: 99%

Interfacial phenomena at the compressed co2-water interface

Bharatwaj

Rocha

2006

Braz. J. Chem. Eng.

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-Compressed CO 2 is considered to be a viable alternative to toxic volatile organic solvents with potential applications in areas including separation reactions, and materials formation processes. Thus an interest in CO 2 stems from the fact that it is very inexpensive, has low toxicity, and is not a regulated. However, compressed CO 2 has a zero dipole moment and weak van der Waals forces and thus is a poor solvent for both polar and most high molecular weight solutes, characteristics that severely restrict its applicability. In order to overcome this inherent inability, surfactant-stabilized organic and aqueous dispersions in CO 2 have been proposed. This work will discuss fundamentals and recent advances in the design of amphiphiles for the novel CO 2 -water interface.

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Effects of the molecular structure of the interface and continuous phase on solubilization of water in water/oil microemulsions

Cited by 217 publications

References 7 publications

Effects of Alkylamines on the Percolation Phenomena in Water/AOT/Isooctane Microemulsions

Effects of Alkylamines on the Percolation Phenomena in Water/AOT/Isooctane Microemulsions

Structure of water-in-oil microemulsions of AOT by infrared spectroscopy

Interfacial phenomena at the compressed co2-water interface

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