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@ARTICLE{Beauvois:888322,
      author       = {Beauvois, Anthony and Vantelon, Delphine and Jestin,
                      Jacques and Rivard, Camille and Bouhnik-Le Coz, Martine and
                      Dupont, Aurélien and Briois, Valérie and Bizien, Thomas
                      and Sorrentino, Andrea and Wu, Baohu and Appavou,
                      Marie-Sousai and Lotfi-Kalahroodi, Elaheh and
                      Pierson-Wickmann, Anne-Catherine and Davranche, Mélanie},
      title        = {{H}ow does calcium drive the structural organization of
                      iron-organic matter aggregates? {A} multiscale
                      investigation},
      journal      = {Environmental science / Nano},
      volume       = {7},
      number       = {9},
      issn         = {2051-8161},
      address      = {Cambridge},
      reportid     = {FZJ-2020-04841},
      pages        = {2833 - 2849},
      year         = {2020},
      abstract     = {Iron–organic matter (Fe–OM) aggregates are a key factor
                      in the control of pollutant mobility. Their physical and
                      structural organization depends on the prevailing
                      physicochemical conditions during their formation and on
                      subsequent exposure to variations in porewater geochemistry.
                      Among these conditions, calcium (Ca) could be a major
                      parameter given its high concentrations in the environment
                      and its affinity for OM. Mimetic environmental Fe–OM–Ca
                      associations were synthesized at various Fe/organic carbon
                      (OC) and Ca/Fe molar ratios using leonardite humic acid as
                      the OM model. The impact of Ca on Fe–OM aggregates was
                      studied by a combination of X-ray absorption spectroscopy,
                      small angle X-ray and neutron scattering and imaging
                      techniques (TEM, cryo-TEM and cryo-TXM). Iron phases are
                      constituted of Fe(III)-oligomers, Fe(III)-nanoparticles and
                      ferrihydrite (Fh), all bound to or embedded in OM. Iron
                      phases exhibit a fractal organization with Fe-primary beads
                      aggregated as Fe-primary aggregates (Fe-PA) which themselves
                      are embedded in OM aggregates. For Ca/OC (mol mol−1) <
                      0.026, Fe-PA aggregate in a third level as an Fe-secondary
                      aggregate. For Ca/OC ≥ 0.026, OM forms a large Ca-branched
                      network in which Ca is bound as a dimer to OM carboxylic
                      sites. Under such conditions, Fe-PA are distributed in the
                      OM network, distant from each other. All these structural
                      transitions are driven by Ca which partially screens the
                      Fe–OM interactions. The formation of such a micrometric
                      network should impact both the surface reactivity of the Fe
                      phases and the mobility of Fe, OM and associated elements,
                      notably in soil pores where they are produced under natural
                      conditions},
      cin          = {JCNS-FRM-II / JCNS-1 / MLZ},
      ddc          = {333.7},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106 / I:(DE-588b)4597118-3},
      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)KWS2-20140101 / EXP:(DE-MLZ)KWS3-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000570558000025},
      doi          = {10.1039/D0EN00412J},
      url          = {https://juser.fz-juelich.de/record/888322},
}