Phase Behavior of Lecithin–Water Mixtures inn-Hexane and Near-Critical Propane

Bartscherer, K.A.; Minier, M.; Renon, H.

doi:10.1006/jcis.1996.0275

Cited by 7 publications

(2 citation statements)

References 9 publications

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“…The two must abundant solvents on earth, water and carbon dioxide, are nonflammable, essentially nontoxic, and environmentally benign. Mixtures of these solvents in the form of micelles, − microemulsions, − miniemulsions, , and macroemulsions − have received increased attention over the past decade. , These CO 2 -based systems are of interest for various applications, including dry cleaning, photoresist drying, cleaning of low dielectric insulators in semiconductor manufacturing, nanoparticle synthesis, and enzymatic catalysis . The formation of micro- and macroemulsions stabilized by low molecular weight and polymeric surfactants in CO 2 -based systems requires new concepts in surfactant design because of CO 2 's lack of a permanent dipole moment and weak van der Waals forces, as reflected in its low polarizability per unit volume.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of Carbon Dioxide-in-Water Emulsions with Silica Nanoparticles

2004

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Stable carbon dioxide-in-water emulsions were formed with silica nanoparticles adsorbed at the interface. The emulsion stability and droplet size were characterized with optical microscopy, turbidimetry, and measurements of creaming rates. The increase in the emulsion stability as the silica particle hydrophilicity was decreased from 100% SiOH to 76% SiOH is described in terms of the contact angles and the resulting energies of attachment for the silica particles at the water-CO(2) interface. The emulsion stability also increased with an increase in the particle concentration, CO(2) density, and shear rate. The dominant destabilization mechanism was creaming, whereas flocculation, coalescence, and Ostwald ripening played only a minor role over the CO(2) densities investigated. The ability to stabilize these emulsions with solid particles at CO(2) densities as low as 0.739 g/mL is particularly relevant in practical applications, given the difficulty in stabilizing these emulsions with surfactants, because of the unusually weak solvation of the surfactant tails by CO(2).

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Section: Introductionmentioning

confidence: 99%

Stabilization of Carbon Dioxide-in-Water Emulsions with Silica Nanoparticles

2004

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“…Introduction of cosurfactants, e.g., aliphatic alcohols, into the lecithin–oil–water system can promote the formation of microemulsions. The presence of caprylic acid or 1‐butanol causes an expansion of the one‐phase region in the lecithin–n‐hexane–water system toward higher concentrations of water: from W cr = 5 for the lecithin gel without cosurfactant to W cr = 30, which is typical for microemulsion (Bartscherer et al, ). The formation and structure of microemulsions were investigated in the lecithin–1‐propanol–water–hexadecane system (Shinoda et al, ).…”

Section: Introductionmentioning

confidence: 99%

Effects of Oleic Acid and Phospholipids on the Formation of Lecithin Organogel and Microemulsion

Мурашова

Prokopova

Трофимова

et al. 2018

J Surfact & Detergents

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The formation of organogels and microemulsions of lecithin in the presence of a biocompatible cosurfactant, oleic acid, was studied. Low content of oleic acid ([oleic acid]/[lecithin] < 0.1) in the lecithin–oleic acid–dodecane–water system leads to an expansion of the region of existence and to a decrease in the viscosity of lecithin organogels. At high contents of oleic acid ([oleic acid]/[lecithin] > 0.6), low‐viscosity microemulsion exists in the system. Phosphatidylethanolamine, lysophosphatidylcholine, and other phospholipids that are present as impurities in the commercial samples of soybean lecithin can act as cosurfactants. For the first time, the formation of lecithin organogels in the systems containing commercial samples of soybean lecithin with phosphatidylcholine concentrations of 69.3 wt% (Lipoid S75) and 52.9 wt% (Lipoid S45) and saturated aliphatic hydrocarbons is demonstrated. The gelation is observed at T =25 °C in octane, decane, dodecane, and hexadecane for Lipoid S75 and in dodecane and hexadecane for Lipoid S45. A decrease in the degree of purification of lecithin leads to an expansion of the regions of existence of the organogels and to a reduction of their viscosity.

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