[637] - Relaxation-relaxation experiments in natural porous media with portable Halbach magnets

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Citation
Haber, A., Haber-Pohlmeier, S., Casanova, F., Blümich, B., 2010. Relaxation-relaxation experiments in natural porous media with portable Halbach magnets. Vadose Zone Journal, 9 (4), 893 - 897. DOI: 10.2136/vzj2009.0179.
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Identification
Title(s):Main Title: Relaxation-relaxation experiments in natural porous media with portable Halbach magnets
Description(s):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(s):DOI: 10.2136/vzj2009.0179
Responsible Party
Creator(s):Author: Agnes Haber
Author: Sabina Haber-Pohlmeier
Author: Federico Casanova
Author: Bernhard Blümich
Publisher:Soil Science Society of America
Topic
TR32 Topic:Soil
Related Sub-project(s):A1
Subject(s):CRC/TR32 Keywords: 2D-Relaxometry, Exchange, NMR, Pore System, Soil, Water Fluxes
DDC: 500 Natural sciences and mathematics
File Details
File Name:2010_Haber_VZJ.pdf
Data Type:Text
Size(s):4 Pages
File Size:733 kB (0.716 MB)
Date(s):Issued: 2009-11-01
Mime Type:application/pdf
Data Format:PDF
Language:English
Status:Completed
Constraints
Download Permission:OnlyTR32
General Access and Use Conditions:For internal use only
Access Limitations:For internal use only
Licence:TR32DB Data policy agreement
Geographic
North:-no map data
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Measurement Region:Laboratory
Measurement Location:--Laboratory--
Specific Informations - Publication
Status:Published
Review:PeerReview
Year:2010
Type:Article
Article Type:Journal
Source:Vadose Zone Journal
Issue:4
Volume:9
Number Of Pages:4
Page Range:893 - 897
Metadata Details
Metadata Creator:Markus Küppers
Metadata Created:2013-12-02
Metadata Last Updated:2016-05-11
Subproject:A1
Funding Phase:1
Metadata Language:English
Metadata Version:V41
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