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@ARTICLE{Amann:189509,
      author       = {Amann, Matthias and Willner, Lutz and Stellbrink, Joerg and
                      Radulescu, Aurel and Richter, Dieter},
      title        = {{S}tudying the concentration dependence of the aggregation
                      number of a micellar model system by {SANS}},
      journal      = {Soft matter},
      volume       = {11},
      number       = {21},
      issn         = {1744-6848},
      address      = {London},
      publisher    = {Royal Soc. of Chemistry},
      reportid     = {FZJ-2015-02663},
      pages        = {4208-4217},
      year         = {2015},
      abstract     = {We present a small-angle neutron scattering (SANS)
                      structural characterization of n-alkyl-PEO polymer micelles
                      in aqueous solution with special focus on the dependence of
                      the micellar aggregation number on increasing concentration.
                      The single micellar properties in the dilute region up to
                      the overlap concentration ϕ* are determined by exploiting
                      the well characterized unimer exchange kinetics of the model
                      system in a freezing and diluting experiment. The micellar
                      solutions are brought to thermodynamic equilibrium at high
                      temperatures, where unimer exchange is fast, and are then
                      cooled to low temperatures and diluted to concentrations in
                      the limit of infinite dilution. At low temperatures the
                      kinetics, and therefore the key mechanism for micellar
                      rearrangement, is frozen on the experimental time scale,
                      thus preserving the micellar structure in the dilution
                      process. Information about the single micellar structure in
                      the semidilute and concentrated region are extracted from
                      structure factor analysis at high concentrations where the
                      micelles order into fcc and bcc close packed lattices and
                      the aggregation number can be calculated by geometrical
                      arguments. This approach enables us to investigate the
                      aggregation behavior in a wide concentration regime from
                      dilute to 6·ϕ*, showing a constant aggregation number with
                      concentration over a large concentration regime up to a
                      critical concentration about three times ϕ*. When exceeding
                      this critical concentration, the aggregation number was
                      found to increase with increasing concentration. This
                      behavior is compared to scaling theories for star-like
                      polymer micelles.},
      cin          = {ICS-1 / Neutronenstreuung ; JCNS-1 / JCNS (München) ;
                      Jülich Centre for Neutron Science JCNS (München) ;
                      JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551) /
                      6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6215 - Soft Matter, Health and Life Sciences (POF3-621)},
      pid          = {G:(DE-HGF)POF3-551 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6215},
      experiment   = {EXP:(DE-MLZ)KWS2-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000354963700008},
      doi          = {10.1039/C5SM00469A},
      url          = {https://juser.fz-juelich.de/record/189509},
}