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@ARTICLE{Raftopoulos:884064,
      author       = {Raftopoulos, Konstantinos N. and Kyriakos, Konstantinos and
                      Nuber, Matthias and Niebuur, Bart-Jan and Holderer, Olaf and
                      Ohl, Michael and Ivanova, Oxana and Pasini, Stefano and
                      Papadakis, Christine M.},
      title        = {{C}o-nonsolvency in concentrated aqueous solutions of
                      {PNIPAM}: effect of methanol on the collective and the chain
                      dynamics},
      journal      = {Soft matter},
      volume       = {16},
      number       = {36},
      issn         = {1744-6848},
      address      = {London},
      publisher    = {Royal Soc. of Chemistry},
      reportid     = {FZJ-2020-03073},
      pages        = {8462-8472},
      year         = {2020},
      abstract     = {The polymer dynamics in concentrated solutions of
                      poly(N-isopropyl acrylamide) (PNIPAM) in D2O/CD3OD mixtures
                      is investigated in the one-phase region. Two polymer
                      concentrations (9 and 25 $wt\%)$ and CD3OD contents in the
                      solvent mixture of 0, 10 and 15 $vol\%$ are chosen.
                      Temperature-resolved dynamic light scattering (DLS) reveals
                      the collective dynamics. Two modes are observed, namely the
                      fast relaxation of polymer segments within the blobs and the
                      slow collective relaxation of the blobs. As the cloud point
                      is approached, the correlation length related to the fast
                      mode increases with CD3OD content. It features critical
                      scaling behavior, which is consistent with mean-field
                      behavior for the 9 $wt\%$ PNIPAM solution in pure D2O and
                      with 3D Ising behavior for all other solutions. While the
                      slow mode is not very strong in the 9 $wt\%$ PNIPAM solution
                      in pure D2O, it is significantly more prominent as CD3OD is
                      added and at all CD3OD contents in the 25 $wt\%$ solution,
                      which may be attributed to enhanced interaction between the
                      polymers. Neutron spin-echo spectroscopy (NSE) reveals a
                      decay in the intermediate structure factor which indicates a
                      diffusive process. For the polymer concentration of 9
                      $wt\%,$ the diffusion coefficients from NSE are similar to
                      the ones from the fast relaxation observed in DLS. In
                      contrast, they are significantly lower for the solutions
                      having a polymer concentration of 25 $wt\%,$ which is
                      attributed to the influence of the dominant large-scale
                      dynamic heterogeneities. To summarize, addition of cosolvent
                      leads to enhanced large-scale heterogeneities, which are
                      reflected in the dynamic behavior at small length scales.},
      cin          = {JCNS-FRM-II / JCNS-1 / MLZ},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-588b)4597118-3},
      pnm          = {6215 - Soft Matter, Health and Life Sciences (POF3-621) /
                      6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6215 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-Juel1)SNS-NSE-20150203 /
                      EXP:(DE-MLZ)J-NSE-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:32856669},
      UT           = {WOS:000571980300012},
      doi          = {10.1039/D0SM01007C},
      url          = {https://juser.fz-juelich.de/record/884064},
}