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    Thermoreversible Transitions Between Self-Assembled Nanostructures in Aqueous Solution

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    No. of downloads: 2959

    Date
    2005-09-02
    Author
    Davies, Tanner
    Advisor
    Raghavan, Srinivasa R
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    Abstract
    We study an unusual transition between two different types of self-assembled structures in aqueous solutions. Mixtures of a cationic surfactant, CTAB and the organic compound, 5-methyl salicylic acid (5mS) spontaneously self-assemble into unilamellar vesicles at room temperature. Upon heating, these vesicles undergo a thermoreversible transition to "wormlike" micelles, i.e., long, flexible micellar chains. This phase transition results in a 1000-fold increase in the solution viscosity with increasing temperature. Small-angle neutron scattering (SANS) measurements show that the phase transition from vesicles to micelles is a continuous one, with the vesicles and micelles co-existing over a range of temperatures. The tunable vesicle-to-micelle transition and the concomitant viscosity increase upon heating may have utility in a range of areas including microfluidics, drug delivery, and enhanced oil recovery.
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    http://hdl.handle.net/1903/3053
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    • Chemical and Biomolecular Engineering Theses and Dissertations
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