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    Complexation-Induced Phase Separation: Preparation of Metal-Rich Polymeric Membranes

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    Luis_Francisco_Villalobos__PhD_Dissertation_Final_version.pdf
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    11.84Mb
    Format:
    PDF
    Description:
    Luis Francisco Villablos - Dissertation
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    Type
    Dissertation
    Authors
    Villalobos, Luis Francisco cc
    Advisors
    Peinemann, Klaus-Viktor cc
    Committee members
    Pinnau, Ingo cc
    Eddaoudi, Mohamed cc
    Freeman, Benny Dean
    Program
    Chemical and Biological Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2017-08
    Embargo End Date
    2017-10-11
    Permanent link to this record
    http://hdl.handle.net/10754/625433
    
    Metadata
    Show full item record
    Access Restrictions
    At the time of archiving, the student author of this dissertation opted to temporarily restrict access to it. The full text of this dissertation became available to the public after the expiration of the embargo on 2017-10-11.
    Abstract
    The majority of state-of-the-art polymeric membranes for industrial or medical applications are fabricated by phase inversion. Complexation induced phase separation (CIPS)—a surprising variation of this well-known process—allows direct fabrication of hybrid membranes in existing facilities. In the CIPS process, a first step forms the thin metal-rich selective layer of the membrane, and a succeeding step the porous support. Precipitation of the selective layer takes place in the same solvent used to dissolve the polymer and is induced by a small concentration of metal ions. These ions form metal-coordination-based crosslinks leading to the formation of a solid skin floating on top of the liquid polymer film. A subsequent precipitation in a nonsolvent bath leads to the formation of the porous support structure. Forming the dense layer and porous support by different mechanisms while maintaining the simplicity of a phase inversion process, results in unprecedented control over the final structure of the membrane. The thickness and morphology of the dense layer as well as the porosity of the support can be controlled over a wide range by manipulating simple process parameters. CIPS facilitates control over (i) the thickness of the dense layer throughout several orders of magnitude—from less than 15 nm to more than 6 μm, (ii) the type and amount of metal ions loaded in the dense layer, (iii) the morphology of the membrane surface, and (iv) the porosity and structure of the support. The nature of the CIPS process facilitates a precise loading of a high concentration of metal ions that are located in only the top layer of the membrane. Moreover, these metal ions can be converted—during the membrane fabrication process—to nanoparticles or crystals. This simple method opens up fascinating possibilities for the fabrication of metal-rich polymeric membranes with a new set of properties. This dissertation describes the process in depth and explores promising applications: (i) catalytic membranes containing palladium nanoparticles (PdNPs), (ii) antibiofouling tight-UF membranes containing silver chloride (AgCl) crystals, and (iii) palladiumrich PBI hollow fibers for H2 recovery.
    Citation
    Villalobos, L. F. (2017). Complexation-Induced Phase Separation: Preparation of Metal-Rich Polymeric Membranes. KAUST Research Repository. https://doi.org/10.25781/KAUST-434HT
    DOI
    10.25781/KAUST-434HT
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-434HT
    Scopus Count
    Collections
    PhD Dissertations; Physical Science and Engineering (PSE) Division; Chemical Engineering Program

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