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@ARTICLE{DellaVecchia:183573,
      author       = {Della Vecchia, Nicola Fyodor and Luchini, Alessandra and
                      Napolitano, Alessandra and D’Errico, Gerardino and
                      Vitiello, Giuseppe and Szekely, Noemi and d’Ischia, Marco
                      and Paduano, Luigi},
      title        = {{T}ris {B}uffer {M}odulates {P}olydopamine {G}rowth,
                      {A}ggregation, and {P}aramagnetic {P}roperties},
      journal      = {Langmuir},
      volume       = {30},
      number       = {32},
      issn         = {1520-5827},
      address      = {Washington, DC},
      publisher    = {ACS Publ.},
      reportid     = {FZJ-2014-06867},
      pages        = {9811 - 9818},
      year         = {2014},
      abstract     = {Despite the growing technological interest of polydopamine
                      (dopamine melanin)-based coatings for a broad variety of
                      applications, the factors governing particle size, shape,
                      and electronic properties of this bioinspired
                      multifunctional material have remained little understood.
                      Herein, we report a detailed characterization of
                      polydopamine growth, particle morphology, and paramagnetic
                      properties as a function of dopamine concentration and
                      nature of the buffer (pH 8.5). Dynamic Light Scattering data
                      revealed an increase in the hydrodynamic radii (Rh) of
                      melanin particles with increasing dopamine concentration in
                      all buffers examined, especially in phosphate buffer.
                      Conversely, a marked inhibition of particle growth was
                      apparent in Tris buffer, with Rh remaining as low as <100 nm
                      during polymerization of 0.5 mM dopamine. Small angle
                      neutron scattering data suggested formation of bidimensional
                      structures in phosphate or bicarbonate buffers, while
                      apparently three-dimensional fractal objects prevailed in
                      Tris buffer. Finally, electron paramagnetic resonance
                      spectra revealed a broader signal amplitude with a peculiar
                      power saturation decay profile for polydopamine samples
                      prepared in Tris buffer, denoting more homogeneous
                      paramagnetic centers with respect to similar samples
                      obtained in phosphate and bicarbonate buffers. Overall,
                      these results disclose Tris buffer as an efficient modulator
                      of polydopamine buildup and properties for the rational
                      control and fine-tuning of melanin aggregate size,
                      morphology, and free radical behavior.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1 /
                      ICS-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)ICS-1-20110106},
      pnm          = {54G - JCNS (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)KWS2-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000340701300022},
      doi          = {10.1021/la501560z},
      url          = {https://juser.fz-juelich.de/record/183573},
}