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@PHDTHESIS{Yan:61650,
      author       = {Yan, Linglong},
      othercontributors = {Beginn, Uwe},
      title        = {{S}elf-assembly of sulfonated amphiphiles for channel-like
                      synthetic membranes},
      address      = {Aachen},
      publisher    = {Publikationsserver der RWTH Aachen University},
      reportid     = {RWTH-CONV-123290},
      pages        = {VI, 160 S. : Ill., graph. Darst.},
      year         = {2006},
      note         = {Prüfungsjahr: 2006. - Publikationsjahr: 2007; Aachen,
                      Techn. Hochsch., Diss., 2006},
      abstract     = {Self-assembly is one of the most useful techniques, which
                      provide a facile strategy to construct structure-defined
                      functional materials, such as ion-selective membranes.
                      Highly selective membranes can eventually form a basis to
                      replace some energy- or labor-intensive purificatiion
                      processes and can also simplify specific detection problems
                      in the fields of biochemical, medical and even environmental
                      analytical technology. In this dissertation, a series of
                      wedge-shaped sulfonic acid derivatives differing in
                      substitution pattern and molecular symmetry as well as in
                      the size of the cationic count-ions, were synthesized and
                      characterized to give a better understanding of the
                      self-assembly process. From the dependence of transition
                      temperatures and enthalpies on the cation diameter, it is
                      conclusive that the occurrence of mesophases of these
                      compounds is more ruled by the geometric shape of the
                      mesogen than by the ionic interactions between cation and
                      sulfonate anion. For example, the symmetrical substituted
                      alkali metal cationic sulfonates all exhibit columnar
                      mesophases either on melting from the crystalline phase or
                      on annealing at the proper temperature. The target molecule
                      with polymerizable groups was also found to exhibit a
                      hexagonal columnar mesophase between 115°C and 233°C, as
                      well as in semi-polar methacrylate solvents as the
                      concentration exceeded $70wt\%.$ Photo-curing this hexagonal
                      columnar mesophase results in a cross-linked polymer film
                      covalently embedded with the cylinders network. The
                      membranes with abundant sulfonate channels were obtained by
                      photo-initiated polymerization in the state of lyotropic
                      columnar mesophases without losing the ordered columnar
                      arrangements. The ion-transport measurements showed their
                      ability to transport small alkalic cations through the
                      channels. The ion transport rates exhibited a decreasing
                      tendency in the sequence of Lithium > Sodium > Potassium
                      cation. Since in a free solution Lithium cation diffuses
                      slower than sodium cation that diffuses slower than
                      potassium cation, this opposite result is indicative of the
                      transport through the supramolecular channels. It is
                      confirmed that the diffusion became controlled by
                      cation-sulfonate interactions during the transport through
                      the supramolecular channels. In the last part of the
                      dissertation, the sulfonated functional membranes with
                      orientated columnar channels were achieved and used as a
                      model system to investigate the mechanism of cation
                      transport through the supramolecular sulfonated channels.
                      Due to the possession of the geometrically defined
                      superstructure, the presented strategy of constructing the
                      channel-like functional membrane gives the potential to
                      modify or tune the performance of the membranes for further
                      application.},
      cin          = {154720 / 150000},
      ddc          = {540},
      cid          = {$I:(DE-82)154720_20140620$ / $I:(DE-82)150000_20140620$},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hbz:82-opus-18219},
      url          = {https://publications.rwth-aachen.de/record/61650},
}