Relaxation-relaxation experiments in natural porous media with portable Halbach magnets
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| Title: | Main Title: Relaxation-relaxation experiments in natural porous media with portable Halbach magnets |
| Description: | Abstract: NMR relaxometry is particularly suitable for the study of water dynamics in natural porous media like soils. The recent development of 1D to 2D correlation experiments provides new tools to investigate exchange processes between different pore classes. In particular, dynamic information can be retrieved by 2D NMR relaxation exchange, where the initial NMR relaxation environment is correlated with the final relaxation environment of molecules migrating from one environment to the other within a so-called NMR mixing time τm. In this work T2-T2 exchange experiments were performed on soil samples at low and moderately inhomogeneous magnetic field with a simple, portable Halbach-Magnet at a proton Larmor frequency of 21.85 MHz. The relaxation curves, analyzed by inverse Laplace transformation, yield 2D T2 relaxation distribution functions from which the exchange pathways between different relaxation sites are unravelled for the investigated soil materials. Whereas fine sand exhibits long relaxation times and a slow weak exchange of water molecules between the pores, the two silt loams from Selhausen and Merzenhausen are characterized by fast exchange between the short relaxation components and multi-site exchange with increasing mixing time. The measured exchange dynamics lead to the conclusion to classify water with T2 relaxation times in the range of 5 ms as mobile. |
| Identifier: | 10.2136/vzj2009.0179 (DOI) |
Responsible Party
| Creators: | Agnes Haber (Author), Sabina Haber-Pohlmeier (Author), Federico Casanova (Author), Bernhard Blümich (Author) |
| Publisher: | Soil Science Society of America |
| Publication Year: | 2013 |
Topic
| TR32 Topic: | Soil |
| Related Subproject: | A1 |
| Subjects: | Keywords: 2D-Relaxometry, Exchange, NMR, Pore System, Soil, Water Fluxes DDC: 500 Natural sciences and mathematics |
File Details
| Filename: | 2010_Haber_VZJ.pdf |
| Data Type: | Text - Article |
| Size: | 4 Pages |
| File Size: | 733 KB |
| Date: | Issued: 01.11.2009 |
| Mime Type: | application/pdf |
| Data Format: | |
| Language: | English |
| Status: | Completed |
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| Download Permission: | Only Project Members |
| General Access and Use Conditions: | For internal use only |
| Access Limitations: | For internal use only |
| Licence: | [TR32DB] Data policy agreement |
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Specific Information - Publication
| Publication Status: | Published |
| Review Status: | Peer reviewed |
| Publication Type: | Article |
| Article Type: | Journal |
| Source: | Vadose Zone Journal |
| Source Website: | www.soils.org |
| Issue: | 4 |
| Volume: | 9 |
| Number of Pages: | 5 (893 - 897) |
Metadata Details
| Metadata Creator: | Markus Küppers |
| Metadata Created: | 02.12.2013 |
| Metadata Last Updated: | 02.12.2013 |
| Subproject: | A1 |
| Funding Phase: | 1 |
| Metadata Language: | English |
| Metadata Version: | V50 |
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| Metadata Downloads: | 0 |
| Dataset Downloads: | 0 |
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