Vapor pressure of phenethyl alocohol and phenethyl acetate in the system with water and nonionic surfactant — Polyoxyethylene 4 lauryl ether (Brij®30)

Aggregation and Rheological Behavior of the Lavender Oil–Pluronic P123 Microemulsions in Water–Ethanol Mixed Solvents

“…Surfactant aided microencapsulation is becoming increasingly important owing to good capability for solubilization, stabilization, and controlled transport of volatile fragrant molecules. − Recently, neutron reflectivity was utilized by Bradbury et al , and Penfold et al , to explore the coadsorption at the air–solution interface of some perfume molecules for optimizing their performance in different formulations. Amphiphilic association structures reduce the rate of evaporation of volatile molecules by reducing the vapor pressure, prolong longevity of fragrance perception, and favor their persistence. − Amphiphilic block copolymer based physical delivery systems have also been used to stabilize sensitive fragrant compounds in water. − Block copolymer micelles have been found to be superior to the micelles of conventional surfactants due to their better solubilization capability, having significant stability at low concentrations and possessing long dissociation time (hours/ days) because of their significant thermodynamic and kinetic stabilities. − Although Pluronic copolymer micelles have been used in aqueous solutions to encapsulate model fragrant molecules like benzyl formate, limonene, and linalool, detailed microstructural investigations have been scarcely done. The phase behavior of ethanolic solution of Pluronics has been subject of several studies, − but very rare reports are available in the literature where such systems have been employed for solubilization studies and effect of solubilizate on the aggregation behavior of Pluronics in ethanolic solvents.…”

Controlled Release of Volatile Fragrance Molecules from PEO-b-PPO-b-PEO Block Copolymer Micelles in Ethanol−Water Mixtures

“…Their cmcs also depend on the molecular weight of the PPO block, and influence the free energy of micellization. ,, Pluronic copolymer micelles have already been used as fragrance delivery systems in water to encapsulate benzyl formate, limonene, or linalool . The presence of aggregates (micelles or vesicles) slowed the evaporation of the volatile molecules by decreasing their vapor pressures when favorable intermolecular interactions were present. − Aqueous systems have charted the basic behavioral tendencies of Pluronic systems; however, other solvent systems have nonetheless elicited interest and research.…”

“…31 The presence of aggregates (micelles or vesicles) slowed the evaporation of the volatile molecules by decreasing their vapor pressures when favorable intermolecular interactions were present. [31][32][33][34][35][36][37] Aqueous systems have charted the basic behavioral tendencies of Pluronic systems; however, other solvent systems have nonetheless elicited interest and research.…”