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    Self-assembled Block Copolymer Membranes with Bioinspired Artificial Channels

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    BurhannudinSutisnaThesis-1.pdf
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    Description:
    Burhannudin Satisna - Final Paper
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    Type
    Dissertation
    Authors
    Sutisna, Burhannudin cc
    Advisors
    Nunes, Suzana Pereira cc
    Committee members
    Pinnau, Ingo cc
    Hadjichristidis, Nikos cc
    Ellis, Amanda
    Program
    Chemical and Biological Engineering
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2018-04
    Embargo End Date
    2019-05-09
    Permanent link to this record
    http://hdl.handle.net/10754/627829
    
    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 2019-05-09.
    Abstract
    Nature is an excellent design that inspires scientists to develop smart systems. In the realm of separation technology, biological membranes have been an ideal model for synthetic membranes due to their ultrahigh permeability, sharp selectivity, and stimuliresponse. In this research, fabrications of bioinspired membranes from block copolymers were studied. Membranes with isoporous morphology were mainly prepared using selfassembly and non-solvent induced phase separation (SNIPS). An effective method that can dramatically shorten the path for designing new isoporous membranes from block copolymers via SNIPS was first proposed by predetermining a trend line computed from the solvent properties, interactions and copolymer block sizes of previously-obtained successful systems. Application of the method to new copolymer systems and fundamental studies on the block copolymer self-assembly were performed. Furthermore, the manufacture of bioinspired membranes was explored using (1) poly(styrene-b-4-hydroxystyrene-b-styrene) (PS-b-PHS-b-PS), (2) poly(styrene-bbutadiene- b-styrene) (PS-b-PB-b-PS) and (3) poly(styrene-b-γ-benzyl-L-glutamate) (PSb- PBLG) copolymers via SNIPS. The structure formation was investigated using smallangle X-ray scattering (SAXS) and time-resolved grazing-Incidence SAXS. The PS-b- PHS-b-PS membranes showed preferential transport for proteins, presumably due to the hydrogen bond interactions within the channels, electrostatic attraction, and suitable pore dimension. Well-defined nanochannels with pore sizes of around 4 nm based on PS-b- PB-b-PS copolymers could serve as an excellent platform to fabricate bioinspired channels due to the modifiable butadiene blocks. Photolytic addition of thioglycolic acid was demonstrated without sacrificing the self-assembled morphology, which led to a five-fold increase in water permeance compared to that of the unmodified. Membranes with a unique feather-like structure and a lamellar morphology for dialysis and nanofiltration applications were obtained from PS-b-PBLG copolymers, which exhibited a hierarchical self-assembled morphology with confined α-helical polypeptide domains. Our results suggest that bioinspired nanochannels can be designed via block copolymer self-assembly using classical methods of membrane preparation. Investigation of the membrane formation mechanism leads us to a better understanding of the design strategies for the development of self-assembled nanochannels from block copolymers. In further outlook, our research could give a contribution to the discovery of future generation materials for water purification and desalination, as well as biological separation.
    Citation
    Sutisna, B. (2018). Self-assembled Block Copolymer Membranes with Bioinspired Artificial Channels. KAUST Research Repository. https://doi.org/10.25781/KAUST-J3756
    DOI
    10.25781/KAUST-J3756
    ae974a485f413a2113503eed53cd6c53
    10.25781/KAUST-J3756
    Scopus Count
    Collections
    Dissertations; Dissertations; Physical Science and Engineering (PSE) Division; Chemical Engineering Program

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