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@ARTICLE{Squaris:11860,
      author       = {Séquaris, J.-M.},
      title        = {{M}odeling the effects of {C}a2+ and clay-associated
                      organic carbon on the stability of colloids from topsoils},
      journal      = {Journal of colloid and interface science},
      volume       = {343},
      issn         = {0021-9797},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-11860},
      pages        = {408 - 414},
      year         = {2010},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {The goals of the study were to investigate the effects of
                      the soil-water phase ionic strength, mainly monitored by the
                      calcium ion (Ca(2+)) concentration, on the stability
                      behavior of easily dispersed topsoil colloidal clay-sized
                      particles (<2 microm). The aggregation kinetics as a
                      function of the Ca(2+) concentration was monitored by
                      measuring the increase of the particle size over time with
                      photon correlation spectroscopy. The critical coagulation
                      concentrations (CCC) of Ca(2+) were measured. The Hamaker
                      constants (A) characterizing the attractive chemical
                      properties of the topsoil colloid surface were thus scaled
                      according to the Derjaguin, Landau, Verwey, Overbeek (DLVO)
                      theory by taking into account the electrokinetic behavior of
                      the particles, measured by the zeta-potential. Effective
                      values for the Hamaker constants of topsoil clay-sized
                      colloids, clay minerals, and metal oxides were calculated by
                      referring to reported values for crystalline silica or sand
                      (quartz) particles. Potential-energy diagrams of interacting
                      topsoil clay-sized colloids were calculated. The primary
                      energy maximum and secondary energy minimum were used for
                      modeling the aggregation kinetics along the Ca(2+)
                      concentration by employing Marmur's model. Coagulation in
                      the secondary energy minimum can only explain the
                      aggregation efficiency of topsoil colloids at low Ca(2+)
                      concentrations (<2 mM Ca(2+)) under unfavorable
                      electrostatic conditions. The effect of surface-associated
                      organic matter on the colloidal electrosteric stability was
                      also investigated by comparing the topsoil colloid stability
                      after the removal of organic matter.},
      keywords     = {J (WoSType)},
      cin          = {ICG-4},
      ddc          = {540},
      cid          = {I:(DE-Juel1)VDB793},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Chemistry, Physical},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:20079501},
      UT           = {WOS:000274602200002},
      doi          = {10.1016/j.jcis.2009.12.014},
      url          = {https://juser.fz-juelich.de/record/11860},
}