Yazar "Iscan, Mehmet" seçeneğine göre listele

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    Influence of hexylamine and alcohols as cosurfactants on microemulsion phase behavior and solubilization
    (St Petersburg Natl Research Univ Information Technologies, Mech & Optics, 2019) Durmaz, Husnuye; Iscan, Mehmet
    This study investigated the influence of cosurfactants on the phase behavior and solubilization capacity of microemulsions. Firstly, we determined the influence of alcohol chain length on the microemulsion solubilization capacity in microemulsion systems containing sodium dodecyl sulfate (SDS), heptane, and water; utilizing n-butanol, n-hexanol, n-octanol and hexylamine as cosurfactants. Then, we compared the effect of the cosurfactant on the solubilization capacity of the microemulsion with SDS. Based on the results, we suggest that hexylamine is a good candidate to produce microemulsions since hexylamine behaved as a cationic surfactant. Secondly, keeping constant the rate of surfactant/cosurfactant and varying the rate of alcohol to hexylamine as cosurfactant, we explain the cosurfactant effect in systems with SDS, alcohol, methylene chloride, and sodium molybdate using the spectrophotometric method. Results showed that the absorbance (ABS) values increased continuously in the systems of n-octanol and n-decanol with increasing amounts of hexylamine. The change in ABS values is considered to be related to microemulsion structure inversion.
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    Interactions of Polyglycol Ethers with Anionic Surfactants in Water
    (Taylor & Francis Inc, 2010) Gelgec, Unal; Iscan, Mehmet
    In order to determine the thermodynamic properties of the aggregation process between sodiun dodecyl sulfate (SDS) and polyglycol ethers (PEG) with average molar mass 35000, 20000, and 10000, the temperature dependence of polymer-surfactant nteraction is used. Surface tension, ionic conductivity, and solubilization methods have been used to quantify the interactions.It was found that the transfer of SDS micelles from aqueous media to aqueous polymer media is more feasible than the reverse. In addition, the hydropholic interaction seems to be important, as opposed to the charge-nonpolar type interaction.
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    Temperature effect on the phase behavior of the systems water/TritonX-100,114,405/n-Butanol/n-Hexane
    (Taylor & Francis Inc, 2008) Sidim, Talia; Iscan, Mehmet
    We have investigated the effect of temperature on the phase behavior and the partition coefficients of nonionic surfactants in water/n-hexane systems. We found that the composition of the conjugate single and two phase solution in the pseudoternary diagram is continuously transformed from one state to other by increasing the temperature. We also demonstrated that the partition coefficient of a nonionic surfactant is a measure of the relative hydrophilic-lipophilic nature of the surfactant, if the measurement is performed at low concentration.