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@ARTICLE{Witte:889676,
      author       = {Witte, Judith and Kyrey, Tetyana and Lutzki, Jana and Dahl,
                      Anna Margarethe and Kühnhammer, Matthias and Klitzing,
                      Regine von and Holderer, Olaf and Wellert, Stefan},
      title        = {{L}ooking inside {P}oly( {N} -isopropylacrylamide)
                      {M}icrogels: {N}anomechanics and {D}ynamics at
                      {S}olid–{L}iquid {I}nterfaces},
      journal      = {ACS applied polymer materials},
      volume       = {3},
      number       = {2},
      issn         = {2637-6105},
      address      = {Washington, DC},
      publisher    = {ACS Publications},
      reportid     = {FZJ-2021-00308},
      pages        = {976–985},
      year         = {2021},
      abstract     = {The continuous improvement of synthesis leads to a great
                      variety in the internal architecture and functionality of
                      colloidal hydrogels. A majority of envisioned applications
                      use microgels as colloidal building blocks for layer
                      formation at solid substrates. In this context, a
                      fundamental understanding of the influence of these
                      substrates on the internal structure and physical properties
                      is essential. Especially, the nanomechanical properties of
                      adsorbed poly(N-isopropylacrylamide) microgel particles are
                      important for their application in cell cultivation,
                      functional surface coatings, and others. Furthermore, these
                      properties are closely related to the swelling behavior and
                      the internal structure and dynamics of these microgels.
                      However, the number of methods that are able to probe the
                      viscoelasticity of adsorbed microgels over the entire
                      vertical particle profile is limited. Grazing incidence
                      neutron scattering techniques are suited to probe
                      soft-matter samples with limited sample volumes at planar
                      solid substrates and allow a resolution in the z-direction.
                      We used neutron spin echo spectroscopy under grazing
                      incidence to access fast thermal fluctuations (10–9 s)
                      over the entire vertical particle profile. Atomic force
                      microscopy nanoindentation was used to characterize the
                      nanomechanical properties of adsorbed microgel particles
                      prepared by batch and continuous monomer feeding methods.
                      The resulting force maps revealed that batch microgels were
                      “hard” and heterogeneous in their Young’s moduli,
                      while the microgels from the continuous method were
                      “soft” and homogeneous. Finally, neutron spin echo
                      spectroscopy under grazing incidence revealed major
                      differences in the vertical dynamic profile of both types of
                      microgels.},
      cin          = {JCNS-FRM-II / MLZ / JCNS-4 / JCNS-1},
      ddc          = {540},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 / I:(DE-588b)4597118-3 /
                      I:(DE-Juel1)JCNS-4-20201012 / I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {6G4 - Jülich Centre for Neutron Research (JCNS) (FZJ)
                      (POF4-6G4) / 632 - Materials – Quantum, Complex and
                      Functional Materials (POF4-632) / DFG project 290879244 -
                      Grenzflächennahe Dynamik nicht quervernetzter und
                      quervernetzter Polymerarchitekturen auf festen planaren
                      Oberflächen},
      pid          = {G:(DE-HGF)POF4-6G4 / G:(DE-HGF)POF4-632 /
                      G:(GEPRIS)290879244},
      experiment   = {EXP:(DE-MLZ)J-NSE-20140101 / EXP:(DE-MLZ)TREFF-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000619799500045},
      doi          = {10.1021/acsapm.0c01265},
      url          = {https://juser.fz-juelich.de/record/889676},
}