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@ARTICLE{Noferini:863812,
      author       = {Noferini, Daria and Faraone, Antonio and Rossi, Marta and
                      Mamontov, Eugene and Fratini, Emiliano and Baglioni, Piero},
      title        = {{D}isentangling {P}olymer {N}etwork and {H}ydration {W}ater
                      {D}ynamics in {P}olyhydroxyethyl {M}ethacrylate {P}hysical
                      and {C}hemical {H}ydrogels},
      journal      = {The journal of physical chemistry / C},
      volume       = {123},
      number       = {31},
      issn         = {1932-7447},
      reportid     = {FZJ-2019-03798},
      pages        = {19183-19194},
      year         = {2019},
      abstract     = {The cross-linker nature and water content may impact the
                      microscopic dynamics of hydrogels components and thus their
                      properties in applications such as drug delivery and water
                      confinement. To investigate these aspects, we used
                      quasi-elastic neutron scattering with contrast variation to
                      distinctly study the polymer and water dynamics in
                      polyhydroxyethyl methacrylate (pHEMA) chemical (cg) and
                      physical (pg) hydrogels with various water contents. For the
                      polymer network, a distribution of relaxation processes was
                      observed, mainly related to the side chains. Water dynamics
                      was found to occur as a H-bond governed process with a
                      jump-diffusion mechanism. The interaction with the polymer
                      matrix considerably slows the water dynamics with respect to
                      bulk water and other confined systems and leads to a
                      fraction of water molecules appearing as immobile. With a
                      higher hydration level, the mobility of both the water and
                      the polymer network increases. For the same water content,
                      pg presents slower relaxation processes and a smaller
                      explored space than their cg equivalents as a result of side
                      chains involvement in the formation of the three-dimensional
                      network typical of hydrogels. In the less hydrated gels,
                      water mobility is sensibly reduced in the cg compared with
                      pg, whereas at higher hydration the mobilities are similar
                      but with shorter residence times in cg.},
      cin          = {JCNS-FRM-II / JCNS-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-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)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000480502300045},
      doi          = {10.1021/acs.jpcc.9b04212},
      url          = {https://juser.fz-juelich.de/record/863812},
}