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@ARTICLE{Lund:201683,
      author       = {Lund, Reidar and Willner, Lutz and Richter, Dieter and
                      Lindner, Peter and Narayanan, Theyencheri},
      title        = {{K}inetic {P}athway of the {C}ylinder-to-{S}phere
                      {T}ransition in {B}lock {C}opolymer {M}icelles {O}bserved in
                      {S}itu by {T}ime-{R}esolved {N}eutron and {S}ynchrotron
                      {S}cattering},
      journal      = {ACS Macro Letters},
      volume       = {2},
      number       = {12},
      issn         = {2161-1653},
      address      = {Washington, DC},
      publisher    = {ACS},
      reportid     = {FZJ-2015-03977},
      pages        = {1082 - 1087},
      year         = {2013},
      abstract     = {Here we present an in situ study of the nonequilibrium
                      cylinder-to-sphere morphological transition kinetics on the
                      millisecond range in a model block copolymer micelle system
                      revealing the underlying mechanism and pathways of the
                      process. By employing the stopped-flow mixing technique, the
                      system was rapidly brought (≈100 μs) deep into the
                      instability region, and the kinetics was followed on the
                      time scale of milliseconds using both time-resolved
                      small-angle neutron and X-ray scattering (TR-SANS and
                      TR-SAXS, respectively). Due to the difference in contrast
                      and resolution, SAXS and SANS provide unique complementary
                      information. Our analysis shows that the morphological
                      transition is characterized by a single rate constant
                      indicating a two-state model where the transition proceeds
                      through direct decomposition (fragmentation) of the
                      cylinders without any transient intermediate structures. The
                      cylindrical segments formed in the disintegration process
                      subsequently grow into spherical micelles possibly through
                      the molecular exchange mechanism until near equilibrium
                      micelles are formed. The observation of a two-step kinetic
                      mechanism, fluctuation-induced fragmentation and
                      ″ripening″ processes, provides unique insight into the
                      nonequilibrium behavior of block copolymer micelles in
                      dilute solutions},
      cin          = {Neutronenstreuung ; JCNS-1 / ICS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)ICS-1-20110106},
      pnm          = {451 - Soft Matter Composites (POF2-451) / 54G - JCNS
                      (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-451 / G:(DE-HGF)POF2-54G24},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000328797600009},
      doi          = {10.1021/mz400521p},
      url          = {https://juser.fz-juelich.de/record/201683},
}