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Characterization of Porous Materials by Magnetic Relaxometry in the Earth’s Field

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Abstract

In this paper, it is shown how free induction decay signals recorded in the Earth’s magnetic field from water protons confined in porous media can be used to derive transversal relaxation times (T 2) and their distributions. After T 2 determination of six sintered glass samples with various pore sizes, the common theoretical model can be fitted to the data set. The T 2 distribution of water protons in a bimodal porous system is analyzed and compared to mercury porosimetry results. The implications for the calculation of pore sizes and pore size distributions of porous media by this method are discussed.

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Notes

  1. This technique is more exactly described as “nuclear induction in the Earth’s magnetic field”.

  2. In a recent revision of the circuit t 0 could be reduced to ~10 ms.

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Acknowledgments

We gratefully thank Dr. Michaela Wilhelm of the Advanced Ceramics Group (http://www.ceramics.uni-bremen.de) at the University of Bremen for providing the freeze-cast ceramic samples and the mercury porosimetry measurements.

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Authors and Affiliations

  1. Department of Physics, University of Bremen, Bremen, Germany

    V. Hormann & H. W. Fischer

  2. Domo Engineering Plastics GmbH, Premnitz, Germany

    M. Veevaete

  3. Physikalische Umweltmesstechnik, Bremen, Germany

    R. Goedecke

Authors
  1. V. Hormann
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  2. M. Veevaete
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  3. R. Goedecke
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  4. H. W. Fischer
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Correspondence to V. Hormann.

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Hormann, V., Veevaete, M., Goedecke, R. et al. Characterization of Porous Materials by Magnetic Relaxometry in the Earth’s Field. Appl Magn Reson 44, 803–815 (2013). https://doi.org/10.1007/s00723-013-0449-7

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  • DOI: https://doi.org/10.1007/s00723-013-0449-7

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