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@ARTICLE{Weller:203159,
      author       = {Weller, Andreas and Slater, Lee and Huisman, Johan
                      Alexander and Esser, Odilia and Haegel, Franz-Hubert},
      title        = {{O}n the specific polarizability of sands and sand-clay
                      mixtures},
      journal      = {Geophysics},
      volume       = {80},
      number       = {3},
      issn         = {1942-2156},
      address      = {Tulsa, Okla.},
      publisher    = {SEG},
      reportid     = {FZJ-2015-05164},
      pages        = {A57 - A61},
      year         = {2015},
      abstract     = {The concept of specific polarizability cp, being the ratio
                      between imaginary conductivity and specific surface area,
                      can be used to represent the polarization of the
                      mineral-fluid interface per unit pore-volume-normalized
                      surface area Spor and to account for the control of the
                      fluid chemistry and/or mineralogy on induced polarization
                      (IP) measurements. We used a database of IP measurements on
                      sands and sand-clay mixtures to investigate the variation in
                      cp as a function of clay content and/or mineralogy. We found
                      an apparent variation in cp between sands and sand-clay
                      mixtures when Spor was calculated using the nitrogen
                      adsorption (Brunauer-Emmett-Teller — BET) method, with
                      clays having an apparently higher cp than sands. However,
                      this variation was considerably reduced when Spor was
                      calculated using a wet-state methylene blue (MB) method that
                      also sensed the surface area associated with internal layers
                      of clay minerals inaccessible with the dry-state BET method.
                      Furthermore, the imaginary conductivity was significantly
                      better correlated with Spor determined from the MB method
                      relative to Spor determined from the BET method. We found no
                      evidence for a strong difference in the specific
                      polarizability of quartz and clay minerals. This finding
                      contradicted predictions from recent mechanistic
                      formulations of the IP response of the Stern layer. Our
                      findings have significant implications for improving and
                      simplifying the interpretation of IP measurements in
                      near-surface materials.},
      cin          = {IBG-3},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255)},
      pid          = {G:(DE-HGF)POF3-255},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000356364300001},
      doi          = {10.1190/geo2014-0509.1},
      url          = {https://juser.fz-juelich.de/record/203159},
}