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@ARTICLE{Scherzinger:19771,
      author       = {Scherzinger, C. and Holderer, O. and Richter, D. and
                      Richtering, W.},
      title        = {{P}olymer {D}ynamics in responsive microgels: influence of
                      cononsolvency and microgel architecture},
      journal      = {Physical Chemistry Chemical Physics},
      volume       = {14},
      issn         = {1463-9076},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {PreJuSER-19771},
      pages        = {2762-2768},
      year         = {2012},
      note         = {This research project has been supported by the European
                      Commission under the 7th Framework Programme through the Key
                      Action: Strengthening the European Research Area, Research
                      Infrastructures. Contract no.: 226507 (NMI3). This work is
                      based on experiments performed at the Julich Centre for
                      Neutron Science JCNS, Forschungszentrum Julich, Germany.},
      abstract     = {The dynamics of polymers on the nm and ns scales inside
                      responsive microgels was probed by means of Neutron Spin
                      Echo (NSE) experiments. Four different microgels were
                      studied: poly(N-isopropylacrylamide) (PNIPAM) and
                      poly(N,N-diethylacrylamide) (PDEAAM) microgels, a
                      P(NIPAM-co-DEAAM) copolymer microgel and a core-shell
                      microgel with a PDEAAM core and a PNIPAM shell. These four
                      different microgel systems were investigated in a
                      D(2)O/CD(3)OD solvent mixture with a molar CD(3)OD fraction
                      of x(MeOD) = 0.2 at 10 °C. The PNIPAM and the
                      P(NIPAM-co-DEAAM) microgels are in the collapsed state under
                      these conditions. They behave as solid diffusing objects
                      with only very small additional contributions from internal
                      motions. The PDEAAM particle is swollen under these
                      conditions and mainly Zimm segmental dynamics can be
                      detected in the intermediate scattering function at high
                      momentum transfer. A cross-over to a collective diffusive
                      motion is found for smaller q-values. The shell of the
                      PDEAAM-core-PNIPAM-shell particle is collapsed, which leads
                      to a static contribution to S(q,t); the core, however, is
                      swollen and Zimm segmental dynamics are observed. However,
                      the contributions of the Zimm segmental dynamics to the
                      scattering function are smaller as compared to the pure
                      PDEAAM particle. Interestingly the values of the apparent
                      solvent viscosities inside the microgels as obtained from
                      the NSE experiments are higher than for the bulk solvent. In
                      addition different values were obtained for the PDEAAM
                      microgel, and the PDEAAM-core of the
                      PDEAAM-core-PNIPAM-shell particle, respectively. We
                      attribute the strongly increased viscosity in the PDEAAM
                      particle to enhanced inhomogeneities, which are induced by
                      the swelling of the particle. The different viscosity inside
                      the PDEAAM-core of the PDEAAM-core-PNIPAM-shell microgel
                      could be due to a confinement effect: the collapsed
                      PNIPAM-shell restricts the swelling of the PDEAAM-core and
                      may modify the hydrodynamic interactions in this restricted
                      environment inside the microgel.},
      keywords     = {J (WoSType)},
      cin          = {ICS-1 / JCNS-1 / JCNS (München) ; Jülich Centre for
                      Neutron Science JCNS (München) ; JCNS-FRM-II},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-1-20110106 / I:(DE-Juel1)JCNS-1-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {BioSoft: Makromolekulare Systeme und biologische
                      Informationsverarbeitung / Großgeräte für die Forschung
                      mit Photonen, Neutronen und Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK505 / G:(DE-Juel1)FUEK415},
      experiment   = {EXP:(DE-MLZ)J-NSE-20140101},
      shelfmark    = {Chemistry, Physical / Physics, Atomic, Molecular $\&$
                      Chemical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:22252036},
      UT           = {WOS:000299742000026},
      doi          = {10.1039/c2cp23328b},
      url          = {https://juser.fz-juelich.de/record/19771},
}