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@ARTICLE{Duschl:278960,
      author       = {Duschl, Markus and Galvosas, Petrik and Brox, Timothy I.
                      and Pohlmeier, Andreas and Vereecken, Harry},
      title        = {{I}n situ determination of surface relaxivities for
                      unconsolidated sediments},
      journal      = {Water resources research},
      volume       = {51},
      number       = {8},
      issn         = {0043-1397},
      address      = {Washington, DC},
      publisher    = {AGU},
      reportid     = {FZJ-2015-07130},
      pages        = {6549 - 6563},
      year         = {2015},
      abstract     = {NMR relaxometry has developed into a method for rapid
                      pore-size determination of natural porous media.
                      Nevertheless, it is prone to uncertainties because of
                      unknown surface relaxivities which depend mainly on the
                      chemical composition of the pore walls as well as on the
                      interfacial dynamics of the pore fluid. The classical
                      approach for the determination of surface relaxivities is
                      the scaling of NMR relaxation times by surface to volume
                      ratios measured by gas adsorption or mercury intrusion.
                      However, it is preferable that a method for the
                      determination of average pore sizes uses the same substance,
                      water, as probe molecule for both relaxometry and surface to
                      volume measurements. One should also ensure that in both
                      experiments the dynamics of the probe molecule takes place
                      on similar length scales, which are in the order of some
                      microns. Therefore, we employed NMR diffusion measurements
                      with different observation times using bipolar pulsed field
                      gradients and applied them to unconsolidated sediments (two
                      purified sands, two natural sands, and one soil). The
                      evaluation by Mitra's short-time model for diffusion in
                      restricted environments yielded information about the
                      surface to volume ratios which is independent of relaxation
                      mechanisms. We point out that methods based on NMR
                      diffusometry yield pore dimensions and surface relaxivities
                      consistent with a pore space as sampled by native pore
                      fluids via the diffusion process. This opens a way to
                      calibrate NMR relaxation measurements with other NMR
                      techniques, providing information about the pore-size
                      distribution of natural porous media directly from
                      relaxometry.},
      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:000363402800037},
      doi          = {10.1002/2014WR016574},
      url          = {https://juser.fz-juelich.de/record/278960},
}