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@ARTICLE{Leroy:834655,
      author       = {Leroy, Philippe and Weigand, Maximilian and Mériguet,
                      Guillaume and Zimmermann, Egon and Tournassat, Christophe
                      and Fagerlund, Fritjof and Kemna, Andreas and Huisman, Johan
                      Alexander},
      title        = {{S}pectral induced polarization of {N}a-montmorillonite
                      dispersions},
      journal      = {Journal of colloid and interface science},
      volume       = {505},
      issn         = {0021-9797},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2017-04559},
      pages        = {1093 - 1110},
      year         = {2017},
      abstract     = {Montmorillonite (Mt) clays have a high specific surface
                      area and surface charge, which confer themremarkable
                      adsorption properties. Nevertheless, their electrochemical
                      and aggregation behavior arenot completely elucidated
                      because of the complexity of their microstructural and
                      interfacial properties.In this work, the conductive and
                      dispersive properties of Na-Mt suspensions of weight
                      fractions $0.5–5.2\%were$ investigated for the first time
                      using the spectral induced polarization method. A
                      four-electrode systemwas used to reduce errors introduced by
                      electrode polarization and contact resistances.
                      Complexconductivity spectra in the low-frequency range of
                      0.1 Hz to 45 kHz were successfully described usinga triple
                      layer model of the basal surface of Mt and a complex
                      conductivity model that considers conductionof the diffuse
                      layer and polarization of the Stern layer. Aggregate size
                      distributions were inferredfrom inverted relaxation time
                      distributions. We found that the negative and permanent
                      surface chargeof the basal plane of Na-Mt controls its
                      quadrature (imaginary) conductivity, which is not very
                      sensitiveto pH and salinity (NaCl) in the 100 Hz to 45 kHz
                      frequency range. For lower frequencies, the suddenincrease
                      of the quadrature conductivity at the highest salinities was
                      explained by considering coagulationof Na-Mt particles.},
      cin          = {IBG-3 / ZEA-2},
      ddc          = {540},
      cid          = {I:(DE-Juel1)IBG-3-20101118 / I:(DE-Juel1)ZEA-2-20090406},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000410464100117},
      doi          = {10.1016/j.jcis.2017.06.071},
      url          = {https://juser.fz-juelich.de/record/834655},
}