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@ARTICLE{Jhalaria:865853,
      author       = {Jhalaria, Mayank and Buenning, Eileen and Huang, Yucheng
                      and Tyagi, Madhusudan and Zorn, Reiner and Zamponi, Michaela
                      and García-Sakai, Victoria and Jestin, Jacques and
                      Benicewicz, BrianC. and Kumar, SanatK.},
      title        = {{A}ccelerated {L}ocal {D}ynamics in {M}atrix-{F}ree
                      {P}olymer {G}rafted {N}anoparticles},
      journal      = {Physical review letters},
      volume       = {123},
      number       = {15},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2019-05142},
      pages        = {158003},
      year         = {2019},
      abstract     = {The tracer diffusion coefficient of six different permanent
                      gases in polymer-grafted nanoparticle (GNP) membranes, i.e.,
                      neat GNP constructs with no solvent, show a maximum as a
                      function of the grafted chain length at fixed grafting
                      density. This trend is reproduced for two different NP sizes
                      and three different polymer chemistries. We postulate that
                      nonmonotonic changes in local, segmental friction as a
                      function of graft chain length (at fixed grafting density)
                      must underpin these effects, and use quasielastic neutron
                      scattering to probe the self-motions of polymer chains at
                      the relevant segmental scale (i.e., sampling local friction
                      or viscosity). These data, when interpreted with a jump
                      diffusion model, show that, in addition to the speeding-up
                      in local chain dynamics, the elementary distance over which
                      segments hop is strongly dependent on graft chain length. We
                      therefore conclude that transport modifications in these GNP
                      layers, which are underpinned by a structural transition
                      from a concentrated brush to semidilute polymer brush, are a
                      consequence of both spatial and temporal changes, both of
                      which are likely driven by the lower polymer densities of
                      the GNPs relative to the neat polymer},
      cin          = {JCNS-FRM-II / JCNS-1 / ICS-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)ICS-1-20110106},
      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-MLZ)SPHERES-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:31702322},
      UT           = {WOS:000489255900010},
      doi          = {10.1103/PhysRevLett.123.158003},
      url          = {https://juser.fz-juelich.de/record/865853},
}