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@ARTICLE{Lungova:824283,
      author       = {Lungova, M. and Krutyeva, M. and Pyckhout-Hintzen, W. and
                      Wischnewski, A. and Monkenbusch, M. and Allgaier, J. and
                      Ohl, M. and Sharp, M. and Richter, D.},
      title        = {{N}anoscale {M}otion of {S}oft {N}anoparticles in
                      {U}nentangled and {E}ntangled {P}olymer {M}atrices},
      journal      = {Physical review letters},
      volume       = {117},
      number       = {14},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2016-06902},
      pages        = {147803},
      year         = {2016},
      abstract     = {We have studied the motion of polyhedral oligomeric
                      silsesquioxane (POSS) nanoparticles modified with
                      poly(ethylene glycol) (PEG) arms immersed in PEG matrices of
                      different molecular weight. Employing neutron spin echo
                      spectroscopy in combination with pulsed field gradient (PFG)
                      NMR we found the following. (i) For entangled matrices the
                      center of mass mean square displacement (MSD) of the
                      PEG-POSS particles is subdiffusive following a t0.56 power
                      law. (ii) The diffusion coefficient as well as the crossover
                      to Fickian diffusion is independent of the matrix molecular
                      weight and takes place as soon as the center of mass has
                      moved a distance corresponding to the particle radius—this
                      holds also for unentangled hosts. (iii) For the entangled
                      matrices Rubinstein’s scaling theory is validated;
                      however, the numbers indicate that beyond Rouse friction the
                      entanglement constraints appear to strongly increase the
                      effective friction even on the nanoparticle length scale
                      imposing a caveat on the interpretation of microrheological
                      experiments. (iv) The oligomer decorated PEG-POSS particles
                      exhibit the dynamics of a Gaussian star with an internal
                      viscosity that rises with an increase of the host molecular
                      weight.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1 /
                      ICS-1 / JCNS-2 / PGI-4 / JCNS-SNS},
      ddc          = {550},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)ICS-1-20110106 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      I:(DE-Juel1)JCNS-SNS-20110128},
      pnm          = {524 - Controlling Collective States (POF3-524) / 6212 -
                      Quantum Condensed Matter: Magnetism, Superconductivity
                      (POF3-621) / 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)POF3-524 / G:(DE-HGF)POF3-6212 /
                      G:(DE-HGF)POF3-6215 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)KWS1-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000384082500028},
      pubmed       = {pmid:27740797},
      doi          = {10.1103/PhysRevLett.117.147803},
      url          = {https://juser.fz-juelich.de/record/824283},
}