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Spontaneous Vesicle Formation in Aqueous Mixtures of Cationic Gemini Surfactant and Sodium Lauryl Ether Sulfate

Bulletin of the Korean chemical society, v.26 no.1, 2005년, pp.107 - 114  

Cheon, Ho-Young (Department of Industrial and Engineering Chemistry, Chungbuk National University) ,  Jeong, Noh-Hee (Department of Industrial and Engineering Chemistry, Chungbuk National University) ,  Kim, Hong-Un (Department of Applied Chemistry, Dongyang Technical College)

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Molecular aggregates of surfactant molecules consisting of one or more bilayers arranged in a hollow, closed, usually spherical geometry are termed “esicles”or “iposomes” In recent years it has been found that in certain systems the vesicular structure forms spontaneously and is long lived, and it h...

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제안 방법

  • In this work, the properties of catanionic spontaneous vesicles32-43 formed in CGS1/SLES surfactant systems, i.e. mixed CMC,44 phase behavior and phase transition temperature of mixtures are investigated. In addition, size and structure of vesicles formed spontaneously in this mixture, mechanism of vesicle formation by geometric structural analysis, and the stability of vesicles are observed.
  • The CTAB/glucuronate glycosides system (diameters up to 25 μm)31 and a DDAB/SDS surfactant system (diameters up to 40 μm), giant vesicles was observed for instance with a differential interference optical microscope. The study on catanionic vesicles has been conducted on the mixed cationic and anionic surfactant systems with single hydrophilic head groups and single alkyl chains, or the mixed systems are composed of a cationic surfactant with one hydrophilic head group and two alkyl chains and an anionic surfactant with one hydrophilic head group and one alkyl chain. However, the study on vesicle systems of a gemini surfactant with two hydrophilic head groups and two alkyl chains and a conventional surfactant with one hydrophilic head group and single alkyl chain has very little.

이론/모형

  • Vesicle Image Observations. Observation of vesicle formation in mixed systems at different SLES mole fractions is confirmed with an electron microscope (JEM-100CX II) using the negative-staining method for sample preparation. As soon as the surfactant mixture solution and an aqueous solution of 2% uranyl acetate (UA, pH 4) were mixed volumetrically at the ratio of 2 : 1, the resultant solution was then added dropwise to a 150-mesh copper grid coated with colloidin, sprayed with a carbon film.
  • The ξ-potentials of the mixed micelles were obtained by measuring their electrophoretic mobilities with a ZetaSizer 2000 (Malvern Instruments Ltd.)45 and by applying a Smoluchowski equation,46 in which the viscosity and dielectric constant of water of the measured temperature were used. The external DC voltage applied for the mobility measurements was constant at 100 V.
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