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@ARTICLE{Behr:292357,
      author       = {Behr, Wolfgang and Behr, Volker C. and Reichenauer, G.},
      title        = {{S}elf diffusion coefficients of organic solvents and their
                      binary mixtures with {CO}2 in silica alcogels at pressures
                      up to 6{MP}a derived by {NMR} pulsed gradient spin echo},
      journal      = {The journal of supercritical fluids},
      volume       = {106},
      issn         = {0896-8446},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PUBDB-2015-06044},
      pages        = {50 - 56},
      year         = {2015},
      note         = {(c) Elsevier B.V. Post referee full text in progress.},
      abstract     = {Self diffusion coefficients were determined using NMR
                      (nuclear magnetic resonance) pulsed gradient spin echo
                      (PGSE) in combination with a special high pressure
                      autoclave. The goal was to determine the self diffusion
                      coefficients for different CO$_{2}$/methanol and CO2/ethanol
                      mixtures within the pore phase of silica alcogels at
                      pressures up to 6 MPa. These values are required as input
                      data for the modeling of process steps preceding the
                      supercritical drying of these gels.The self diffusion
                      coefficients derived with the set-up at 15 °C for
                      unconfined CO$_{2}$/methanol and CO$_{2}$/ethanol mixtures
                      as a function of concentration of the organic solvent as
                      well as of fluid pressure are in line with results from
                      previous publications thus proofing the approach to provide
                      reliable data.Measurements of self diffusion coefficients of
                      methanol at different pressures and methanol/CO$_{2}$ ratios
                      were performed in tetramethoxysilane based silica alcogels
                      with target densities ranging from 80 to 200 kg/m3; the
                      results reveal tortuosities of up to 2.5 depending on the
                      silica fraction in the gel as well as its structure. The
                      experimental self diffusion coefficients are in good
                      agreement with the transport diffusion coefficient
                      determined from time resolved NMR imaging of a fluid
                      exchange within a alcogel of methanol for CO$_{2}$ at 5.8
                      MPa.},
      cin          = {DOOR},
      ddc          = {540},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {899 - ohne Topic (POF3-899)},
      pid          = {G:(DE-HGF)POF3-899},
      experiment   = {EXP:(DE-H253)D-B1-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000363348500008},
      doi          = {10.1016/j.supflu.2015.05.024},
      url          = {https://bib-pubdb1.desy.de/record/292357},
}