Phase behavior of the orange essential oil/sodium bis(2-ethylhexyl)sulfosuccinate/water system

Feitosa, Eloi; Cavalcante, Vanessa R.O.; Amáral, L. Q.

doi:10.1016/j.colsurfa.2009.06.039

Cited by 6 publications

(4 citation statements)

References 17 publications

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“…Besides, this different phase behavior could also be ascribed to the interaction between the oil molecule and the hydrophobic groups of the surfactant, which might change the shape and size of ‘aqueous core’, and subsequently the water capacity of the RM system . It was also reported that the phase diagram relates to the phenomenon that the interfacial force could decrease caused by shortening the surfactant hydrocarbon chain length due to the interaction between the ‘aqueous core shell’ and the oil phase .…”

Section: Resultsmentioning

confidence: 99%

Laccase behavior in the microenvironment of water core within a biosurfactant-based reversed micelles system rhamnolipid/n-hexanol/isooctane/water

Cui

Sun

Huang

et al. 2015

Surf. Interface Anal.

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Compared with synthetic surfactants (cetyltrimethyl ammonium bromide, sodium bis(2‐ethylhexyl) sulfosuccinate and Tween‐80), the properties of the aqueous core as well as the microenvironment behavior were investigated in water‐in‐oil microemulsions, which are formed by water and biosurfactant rhamnolipid (RL) in the solvent of isooctane/n‐hexanol (1:1, v/v). Besides, as a typical substrate of lignocellulose, guaiacol was used to detect the laccase activity in reversed micelles (RMs). The results were eventually confirmed that RL‐based RM system has higher solubilization ability, more friendly environmental compatibility and milder reaction microenvironment than the others. In this study, triangle phase diagram of surfactant/n‐hexanol/isooctane/water was constructed to analyze the variation of phase behavior between each RM system. For the RL‐based RM system, the effect of the molar ratio of water to surfactant (ω0) on enzyme hydrolytic activity was also determined to be shown as a bell‐shaped curve and presented a maximum at ω0 = 19; the O―H stretching vibrations of water in aqueous core was also studied by analyzing the IR spectrum over the region of 3050–3750 cm−1. Moreover, kinetic studies showed that the catalytic efficiency of the laccase in RL‐based RM system was lower than in aqueous solution. Nevertheless, the RM system obtained the highest hydrolysis rate at RL concentration of 1.0CMC, which is 0.055 mM. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Resultsmentioning

confidence: 99%

Laccase behavior in the microenvironment of water core within a biosurfactant-based reversed micelles system rhamnolipid/n-hexanol/isooctane/water

Cui

Sun

Huang

et al. 2015

Surf. Interface Anal.

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“…Reverse micelles (reverse microemulsions) are thermodynamically stable and isotropic systems that are constituted by water, oil, and one or more surfactants. The structure and properties of reverse micelles have been extensively investigated by employing a variety of physicochemical techniques, such as FT-IR, , NMR, fluorescence spectroscopy, , conductivity, , calorimetry, , dynamic light scattering (DLS), − and small-angle X-ray scattering (SAXS), − etc. Of these, the conductivity method provides a particularly convenient, useful, and accessible tool for probing the structure and phase behaviors of reverse microemulsions. , Percolation of conductance is one of the important physicochemical properties of w/o microemulsions, and it is generally believed that during the percolation process dispersed water droplets cluster/associate and ions either “hop” from droplet to droplet or are transferred by way of “transient fusion and mass exchange” .…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Structure of Water/AOT/IPM/Alcohols Reverse Micelles by Conductivity, Dynamic Light Scattering, and Small Angle X-ray Scattering

et al. 2012

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We have systematically investigated the effect of alcohols (ethanol, propanol, butanol, and pentanol) on the structure of the water/AOT/IPM system using conductivity, dynamic light scattering (DLS), and small-angle X-ray scattering (SAXS) techniques. The results show that no percolation phenomenon is observed in the water/AOT/IPM system, whereas the addition of ethanol (propanol and butanol) induces apparently percolation. The threshold water content (W(p)) depends closely on the alcohol type and concentration. The effect of alcohols on the conductance behavior is discussed from the physical properties of alcohols, the interfacial flexibility, and the attractive interactions between droplets. The hydrodynamic diameter of droplets (d(H)) obtained from DLS increases markedly with the increase in water content (W(0)); however, it decreases gradually with increasing alcohol chain length and concentration. SAXS measurements display distinctly the shoulder, the low hump peaks, and the heavy tail phenomenon in the pair distance distribution function p(r) profile, which rely strongly on the alcohol species and its concentration. The gyration radius (R(g)) increases with increasing W(0), and decreases with the increase of alcohol chain length and concentration. Schematic diagram of the conductance mechanism of water/AOT/IPM/alcohol systems is primarily depicted. Three different phases of the discrete droplets, the oligomers, and the isolated ellipsoidal droplets existed in the different W(0) ranges correspond to three different stages in the conductivity-W(0) curve. Coupling the structure characteristics of reverse micelles obtained from DLS and SAXS techniques with conductivity could be greatly helpful to deeply understand the percolation mechanism of water/AOT/IPM/alcohols systems.

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“…For our experiments, we have chosen two surfactant volume fractions in the range studied by Nallet et al: 0.2 and 0.6. Note that systems similar to ours have been studied elsewhere (see for instance Feitosa et al, 2009;Nees & Wolff, 1996).…”

Section: Introductionmentioning

confidence: 94%

Concentrated phases of an ionic surfactant (Aerosol OT) in polar solvents

Berrellez

Tánori

Acedo-Mendoza

et al. 2021

J Surfact & Detergents

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We have studied concentrated phases of Aerosol OT (AOT) in polar (water, ethylene glycol, formamide, N,N-dimethylformamide) and apolar (isooctane) solvents. We investigated two surfactant volume fractions (φ = 0.2 and φ = 0.6) with small angle x-ray scattering (SAXS), rheology and electrical conductivity experiments. AOT self-assembles differently depending on solvent type and concentration. SAXS experiments show that the AOT/water system displays a lamellar phase. In the other cases, only formamide displays a lamellar phase for φ = 0.6. The other solvents (and formamide at φ = 0.2) promote the self-assembly of AOT in other microstructures. The SAXS spectra display correlation peaks consistent with a disordered array of cylindrical aggregates. The microstructure of the AOT/isooctane system at φ = 0.2 is that of an arrangement of spherical aggregates. The results are explained in terms of surfactant packing models and solvent properties. For instance, the ability of ethylene glycol to form hydrogen bonds with AOT promotes the formation of cylindrical aggregates by increasing the area per surfactant polar head. As N,N-dimethylformamide is slightly miscible in hydrocarbons it increases the volume of the surfactant tail promoting reverse structures.

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Phase behavior of the orange essential oil/sodium bis(2-ethylhexyl)sulfosuccinate/water system

Cited by 6 publications

References 17 publications

Laccase behavior in the microenvironment of water core within a biosurfactant-based reversed micelles system rhamnolipid/n-hexanol/isooctane/water

Laccase behavior in the microenvironment of water core within a biosurfactant-based reversed micelles system rhamnolipid/n-hexanol/isooctane/water

Investigation on the Structure of Water/AOT/IPM/Alcohols Reverse Micelles by Conductivity, Dynamic Light Scattering, and Small Angle X-ray Scattering

Concentrated phases of an ionic surfactant (Aerosol OT) in polar solvents

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