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@PHDTHESIS{Zhang:459453,
      author       = {Zhang, Yan},
      othercontributors = {Blümich, Bernhard},
      title        = {{S}patially resolved 2{D} {L}aplace {NMR}},
      address      = {Aachen},
      publisher    = {Publikationsserver der RWTH Aachen University},
      reportid     = {RWTH-CONV-145361},
      pages        = {86 S. : Ill., graph. Darst.},
      year         = {2014},
      note         = {Druckausg.: Zhang, Yan: Spatially resolved 2D Laplace NMR;
                      Aachen, Techn. Hochsch., Diss., 2014},
      abstract     = {Within the past decade, 2D Laplace nuclear magnetic
                      resonance (NMR) has been proved to be a powerful method to
                      investigate porous materials. However, it gives information
                      only about integral characteristics of a given sample with
                      regard to pore-size and pore connectivity. It is therefore
                      desirable to combine MRI with 2D-Laplace NMR to generate
                      information about fluid transport within defined areas of a
                      sample. Spatially resolved D-T2 correlation maps were
                      measured for four different samples: glass beads with
                      different bead diameters saturated with water, glass beads
                      filled with oil and water separated by a membrane, a wet
                      mortar sample and glass beads filled with oil and water
                      without a membrane. The information contained in pixels of
                      similar contrast were exploited by spatially resolved D-T2
                      correlation NMR as a representative of 2D-Laplace NMR.
                      Summation of pixels with similar contrast and low spatial
                      resolution have been chosen to accelerate the measurement
                      time which is inherently long for 2D-Laplace resolved MRI.
                      This method reveals the heterogeneous information of these
                      samples and is expected to be appreciated by the oil
                      industry. Moreover, Gint2D - T2 maps were obtained to study
                      the relationship between pore space and internal gradients
                      in porous media. Three different kinds of samples were
                      measured, which are glass beads with different bead
                      diameters saturated with water, glass beads filled with oil
                      and water, and a wet mortar sample. Two different cases are
                      distinguished: 1) The heterogeneity of internal gradients
                      dominates the heterogeneity of diffusion coefficients, which
                      concerns the first sample. 2) The heterogeneity of diffusion
                      coefficients dominates the heterogeneity of internal
                      gradients, which occurs in the second sample. Only in the
                      first case, the internal gradients can be estimated when
                      assuming a constant diffusion coefficient across the sample.
                      This result delineates the limitations of this assumption.
                      Then the correlation maps of mortar were measured and
                      internal gradient distributions were acquired to explore the
                      utility of this method in reality. Finally, spatially
                      resolved Gint2D - T2 maps were studied at 7 T and 16 T to
                      probe sample heterogeneity.},
      keywords     = {Poröser Stoff (SWD) / Kernspintomographie (SWD) /
                      Magnetische Kernresonanz (SWD) / Entspannung (SWD) /
                      Diffusion (SWD)},
      cin          = {150000 / 154110},
      ddc          = {540},
      cid          = {$I:(DE-82)150000_20140620$ / $I:(DE-82)154110_20140620$},
      typ          = {PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:hbz:82-opus-52220},
      url          = {https://publications.rwth-aachen.de/record/459453},
}