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@ARTICLE{Gunet:843896,
      author       = {Guénet, Hélène and Davranche, Mélanie and Vantelon,
                      Delphine and Gigault, Julien and Prévost, Sylvain and
                      Taché, Olivier and Jaksch, Sebastian and Pédrot, Mathieu
                      and Dorcet, Vincent and Boutier, Antoine and Jestin,
                      Jacques},
      title        = {{C}haracterization of iron–organic matter nano-aggregate
                      networks through a combination of {SAXS}/{SANS} and {XAS}
                      analyses: impact on {A}s binding},
      journal      = {Environmental science / Nano},
      volume       = {4},
      number       = {4},
      issn         = {2051-8161},
      address      = {Cambridge},
      reportid     = {FZJ-2018-01423},
      pages        = {938 - 954},
      year         = {2017},
      abstract     = {Nanoparticles play an important role in controlling the
                      mobility of pollutants such as arsenic (As) in the
                      environment. In natural waters, aggregates of nanoparticles
                      can be constituted of organic matter (OM) associated with
                      iron (Fe). However, little is known about their network
                      structure, especially the role of each component in the
                      resulting aggregate morphology. This network structure can
                      be of major importance for the metal and metalloid sorption
                      processes. We synthesized an aggregate model of
                      nanoparticles by varying the Fe/organic carbon (OC) ratio
                      (R). By coupling small-angle neutron and X-ray scattering
                      (SANS, SAXS), dynamic light scattering (DLS), transmission
                      electron microscopy (TEM) and X-ray absorption spectroscopy
                      (XAS), we revealed the fractal organization of Fe (i.e.
                      primary beads forming a nanoparticle called an intermediate
                      aggregate and then forming a secondary aggregate of
                      nanoparticles). As the aggregate size increases with R, the
                      As adsorption rate increases at a constant As/Fe ratio. Two
                      hypotheses were considered: with increasing R, i) the
                      repulsion interactions between the nanoparticles increase,
                      inducing a structure opening, and ii) the Fe part size
                      increases more strongly and is more ramified than the OM
                      part, leading to a decrease of the coating by OM. Both
                      hypotheses involve an increase in the number of available As
                      binding sites. This study offers new perspectives on the
                      impact of the network structure of heterogeneous
                      nano-aggregates on their sorption capacity and could explain
                      some metal/metalloid sorption variations observed in natural
                      samples with variations in Fe/OC ratios.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)KWS1-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000399430500019},
      doi          = {10.1039/C6EN00589F},
      url          = {https://juser.fz-juelich.de/record/843896},
}