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@ARTICLE{MorenoGuerra:867902,
      author       = {Moreno-Guerra and Romero-Sanchez and Martinez-Borquez and
                      Tassieri and Stiakakis, Emmanuel and Laurati},
      title        = {{M}odel free {R}heo-{AFM} probes the viscoelasticity of
                      tunable {DNA} soft colloids},
      journal      = {Small},
      volume       = {15},
      issn         = {1613-6810},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2019-06504},
      pages        = {1904136},
      year         = {2019},
      abstract     = {Atomic force microscopy rheological measurements
                      (Rheo‐AFM) of the linear viscoelastic properties of
                      single, charged colloids having a star‐like architecture
                      with a hard core and an extended, deformable
                      double‐stranded DNA (dsDNA) corona dispersed in aqueous
                      saline solutions are reported. This is achieved by analyzing
                      indentation and relaxation experiments performed on
                      individual colloidal particles by means of a novel
                      model‐free Fourier transform method that allows a direct
                      evaluation of the frequency‐dependent linear viscoelastic
                      moduli of the system under investigation. The method
                      provides results that are consistent with those obtained via
                      a conventional fitting procedure of the force‐relaxation
                      curves based on a modified Maxwell model. The outcomes show
                      a pronounced softening of the dsDNA colloids, which is
                      described by an exponential decay of both the Young's and
                      the storage modulus as a function of the salt concentration
                      within the dispersing medium. The strong softening is
                      related to a critical reduction of the size of the dsDNA
                      corona, down to $≈70\%$ of its size in a salt‐free
                      solution. This can be correlated to significant topological
                      changes of the dense star‐like polyelectrolyte forming the
                      corona, which are induced by variations in the density
                      profile of the counterions. Similarly, a significant
                      reduction of the stiffness is obtained by increasing the
                      length of the dsDNA chains, which we attribute to a
                      reduction of the DNA density in the outer region of the
                      corona.},
      cin          = {ICS-3},
      ddc          = {540},
      cid          = {I:(DE-Juel1)ICS-3-20110106},
      pnm          = {551 - Functional Macromolecules and Complexes (POF3-551)},
      pid          = {G:(DE-HGF)POF3-551},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:31460707},
      UT           = {WOS:000483950300001},
      doi          = {10.1002/smll.201904136},
      url          = {https://juser.fz-juelich.de/record/867902},
}