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    Mesoscopic Simulations of the Phase Behavior of Aqueous EO 19 PO 29 EO 19 Solutions Confined and Sheared by Hydrophobic and Hydrophilic Surfaces

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    Type
    Article
    Authors
    Liu, Hongyi
    Li, Yan
    Krause, Wendy E.
    Pasquinelli, Melissa A.
    Rojas, Orlando J.
    Date
    2011-12-19
    Online Publication Date
    2011-12-19
    Print Publication Date
    2012-01-25
    Permanent link to this record
    http://hdl.handle.net/10754/600231
    
    Metadata
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    Abstract
    The MesoDyn method is used to investigate associative structures in aqueous solution of a nonionic triblock copolymer consisting of poly(propylene oxide) capped on both ends with poly(ethylene oxide) chains. The effect of adsorbing (hydrophobic) and nonadsorbing (hydrophilic) solid surfaces in contact with aqueous solutions of the polymer is elucidated. The macromolecules form self-assembled structures in solution. Confinement under shear forces is investigated in terms of interfacial behavior and association. The formation of micelles under confinement between hydrophilic surfaces occurs faster than in bulk aqueous solution while layered structures assemble when the polymers are confined between hydrophobic surfaces. Micelles are deformed under shear rates of 1 μs -1 and eventually break to form persistent, adsorbed layered structures. As a result, surface damage under frictional forces is prevented. Overall, this study indicates that aqueous triblock copolymers of poly(ethylene oxide) (PEO) and poly(propylene oxide) (PPO) (Pluronics, EO mPO nEO m) act as a boundary lubricant for hydrophobic surfaces but not for hydrophilic ones. © 2011 American Chemical Society.
    Citation
    Liu H, Li Y, Krause WE, Pasquinelli MA, Rojas OJ (2012) Mesoscopic Simulations of the Phase Behavior of Aqueous EO 19 PO 29 EO 19 Solutions Confined and Sheared by Hydrophobic and Hydrophilic Surfaces . ACS Applied Materials & Interfaces 4: 87–95. Available: http://dx.doi.org/10.1021/am200917h.
    Sponsors
    This work was partially supported by the National Textile Center under Grant C05-NS09. We thank Dr. Juan Hinestroza at Cornell University for helpful discussions.
    Publisher
    American Chemical Society (ACS)
    Journal
    ACS Applied Materials & Interfaces
    DOI
    10.1021/am200917h
    PubMed ID
    22136187
    ae974a485f413a2113503eed53cd6c53
    10.1021/am200917h
    Scopus Count
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