Nano‐droplet formation in fragrance tinctures

Marcus, Julien; Klossek, Michael L.; Touraud, Didier; Kunz, Werner

doi:10.1002/ffj.3172

Cited by 46 publications

(40 citation statements)

References 10 publications

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“…However, due to the lack of the surfactant, conductivity enhances only within one order of magnitude. The molecule forming the interface between water droplets and the citronellol-rich surrounding medium has been found in previous studies 2,9 unequivocally as being ethanol, and according to that in the systems studied here, the ethanol is the main component of the interfacial film whenever microstructures are present. As shown in Figure 3a, the low conductivity below φ w p suggests that the reverse droplets are discrete (isolated droplets in a non-conducting citronellol medium, forming w/o microemulsion) and show rare interaction.…”

Section: Electrical Conductivity Measurements and Microregions Of supporting

confidence: 82%

“…Similar results on existence of microemulsion aggregates in that area are known from literature for DLS and SLS experiments. 9 The data above the percolation threshold (Figure 4) cannot be described neither by static nor dynamic percolation theories because the values of p, obtained by fitting these data, are not in line with the theoretical value. These phenomena are possibly caused by the fact that the situation of Surfactant-Free-Microemulsions cannot satisfy the assumption of this percolation theory, namely when above φ w p , due to the hydrogen bonding interaction, more and more water molecules permeate into the barrier layer formed by the short chain alcohol (ethanol) with the increase of water weight fraction.…”

Section: Electrical Conductivity Measurements and Microregions Of mentioning

confidence: 92%

“…9 Conductivity measurements were performed at (25 ± 0.01) °C using a dipping type conductivity cell Orion (model 018001) with two electrodes of bright platinum. The cell constant (0.10402 ± 0.00002 cm -1 ) was determined by calibration with aqueous potassium chloride solutions in the concentration range from 0.001 to 0.05 mol dm -3 .…”

Section: Procedures and Apparatusmentioning

confidence: 99%

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The Nanostructure Studies of Surfactant-Free-Microemulsions in Fragrance Tinctures

Bošković

Sokol

Touraud

et al. 2016

ACSi

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As it was shown recently that nanostructures can exist in water-ethanol-citronellol tinctures, a deeper investigation of these media was performed using conductivity, UV-Vis and FT-IR spectroscopy techniques. Different regimes of conductivity, depending on the water content, an increase of the polarity of the polar pseudo-phase with increasing water content, and even the presence of free water molecules at higher water content are observed, just as in classical surfactant-based microemulsions. The percolation model, generally used to fit conductivity data in surfactant based microemulsion having a weak interfacial film, can be used to fit our conductivity data below a critical water content (φ w p ) with a critical exponent typical of dynamic percolation. In presence of higher water contents, superior to φ w p , obtained conductivity data cannot be fitted neither with a static nor a dynamic percolation model. As in surfactant-based microemulsions, an increase of polarity of the microenvironment with increasing water content can be postulated using respectively the UV-Vis wavelength absorption band (λ max ) of methyl orange and performing FT-IR spectra.

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Section: Electrical Conductivity Measurements and Microregions Of supporting

confidence: 82%

Section: Electrical Conductivity Measurements and Microregions Of mentioning

confidence: 92%

Section: Procedures and Apparatusmentioning

confidence: 99%

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The Nanostructure Studies of Surfactant-Free-Microemulsions in Fragrance Tinctures

Bošković

Sokol

Touraud

et al. 2016

ACSi

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“…Ouzo, Limoncello, and Pommeau liquors are popular in several European countries and produced by maceration of plants with a specific amount of ethanolic solutions containing some waterinsoluble compounds (3). Adding water to those solutions leads to spontaneous formation of fine emulsions with a remarkable stability, a phenomenon that is called the "Ouzo effect" (4).…”

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confidence: 99%

How to explain microemulsions formed by solvent mixtures without conventional surfactants

Zemb

Klossek

Lopian

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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Ternary solutions containing one hydrotrope (such as ethanol) and two immiscible fluids, both being soluble in the hydrotrope at any proportion, show unexpected solubilization power and allow strange but yet unexplained membrane enzyme activity. We study the system ethanol-water-octanol as a simple model of such kinds of ternary solutions. The stability of "detergentless" micelles or microemulsions in such mixtures was proposed in the pioneering works of Barden and coworkers [Smith GD, Donelan CE, Barden RE (1977) J Colloid Interface Sci 60(3):488-496 and Keiser BA, Varie D, Barden RE, Holt SL (1979) J Phys Chem 83(10):1276-1281] in the 1970s and then, neglected, because no general explanation for the observations was available. Recent direct microstructural evidence by light, X-ray, and neutron scattering using contrast variation reopened the debate. We propose here a general principle for solubilization without conventional surfactants: the balance between hydration force and entropy. This balance explains the stability of microemulsions in homogeneous ternary mixtures based on cosolvents.A dding slightly hydrophobic compounds to water can lead to structureless solutions, aggregate formation, or even, formation of defined structures, such as micelles, in the case where the added compound is a surfactant. In ternary or quaternary mixtures containing at least one type of surfactant, the formation of microemulsions usually occurs in specific parts of the phase diagram. These macroscopically homogeneous, transparent liquids are composed of well-defined microstructures with specific signatures in scattering experiments (1). It was only recently that similar structures, designated as "pre-Ouzo," were found and characterized in ternary mixtures of two partly miscible solvents and one hydrotropic cosolvent (2). In this paper, we present a theory that explains and even predicts the existence of such structures in "detergentless" formulations.Ouzo, Limoncello, and Pommeau liquors are popular in several European countries and produced by maceration of plants with a specific amount of ethanolic solutions containing some waterinsoluble compounds (3). Adding water to those solutions leads to spontaneous formation of fine emulsions with a remarkable stability, a phenomenon that is called the "Ouzo effect" (4). Even common mouthwash products show a similar phenomenon. In common, they entirely clear up on addition of ethanol and get milky with the addition of water (5).Ternary surfactant-free model systems, such as decane-waterisobutoxyethanol [as studied by Shinoda and Kunieda (6)], however, show this Ouzo effect only for specific points in the composition diagram. The precondition for such behavior seems to be the mixture of two miscible (either completely or at least to a large degree) solvents 1 and 2 with a solute that can also be a liquid (7) (e.g., anethole in the case of Ouzo; component 3). This component 3 must be highly soluble in one solvent (e.g., ethanol) but poorly soluble in the other one (e.g., water) (8).Where...

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“…In previous works [19][20][21][22], we have investigated the presence of nanostructures in different water/ethanol/hydrophobic molecule systems. In the present study, the formation of liquid nanostructures is investigated in media with ethanol and rapeseed oil using dynamic and static light scattering, small-angle neutron scattering and conductivity measurements.…”

Section: Introductionmentioning

confidence: 99%

Nanostructures in clear and homogeneous mixtures of rapeseed oil and ethanol in the presence of green additives

et al. 2015

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Nano‐droplet formation in fragrance tinctures

Cited by 46 publications

References 10 publications

The Nanostructure Studies of Surfactant-Free-Microemulsions in Fragrance Tinctures

The Nanostructure Studies of Surfactant-Free-Microemulsions in Fragrance Tinctures

How to explain microemulsions formed by solvent mixtures without conventional surfactants

Nanostructures in clear and homogeneous mixtures of rapeseed oil and ethanol in the presence of green additives

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