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@ARTICLE{Maccarrone:282922,
      author       = {Maccarrone, Simona and Mergel, Olga and Plamper, Felix A.
                      and Holderer, Olaf and Richter, Dieter},
      title        = {{E}lectrostatic {E}ffects on the {I}nternal {D}ynamics of
                      {R}edox-{S}ensitive {M}icrogel {S}ystems},
      journal      = {Macromolecules},
      volume       = {49},
      number       = {5},
      issn         = {1520-5835},
      address      = {Washington, DC},
      publisher    = {Soc.},
      reportid     = {FZJ-2016-01657},
      pages        = {1911–1917},
      year         = {2016},
      abstract     = {Microgels are flexible entities with a number of properties
                      which can be tailored for a variety of applications. For
                      redox-sensitive PNIPAM-based microgels involved in this
                      study, the size and effective charge of microgels can be
                      manipulated by electrochemical means. The electrochemical
                      switching is implemented via interaction of redox-sensitive
                      counterions (hexacyanoferrates: HCF) with oppositely charged
                      (cationic) thermoresponsive microgels. Effects on the
                      internal dynamics upon uptake of HCF and increased
                      hydrophobicity with temperature are investigated with
                      neutron spin echo spectroscopy. The polymer segmental
                      dynamics is well described by the Zimm model. Unbalanced
                      charges (in absence of HCF) apparently shorten the polymer
                      length acting like confined discontinuity points (pinning).
                      This effect vanishes in the presence of HCF. The ability of
                      multivalent ferricyanides to bind several monovalent polymer
                      charges at the same time produces an apparent secondary
                      network. This effective bridging makes the dynamics slower
                      analogous to an increase in cross-linker density. In support
                      of this picture, an enhanced viscosity of the medium, where
                      the polymer chains move, was obtained by the fitting},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {6215 - Soft Matter, Health and Life Sciences (POF3-621) /
                      6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623)
                      / 6G15 - FRM II / MLZ (POF3-6G15)},
      pid          = {G:(DE-HGF)POF3-6215 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6G15},
      experiment   = {EXP:(DE-MLZ)J-NSE-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000371851100044},
      doi          = {10.1021/acs.macromol.5b02544},
      url          = {https://juser.fz-juelich.de/record/282922},
}