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Diffusive diffraction observed with volume-selective STEAM MRS in 100 mu m water-filled capillaries

Gedat, E. and Buntkowsky, G. and Braun, J. :
Diffusive diffraction observed with volume-selective STEAM MRS in 100 mu m water-filled capillaries.
[Online-Edition: <Go to ISI>://WOS:000259802400017]
In: Solid State Nuclear Magnetic Resonance, 34 (1-2) pp. 118-124.
[Article] , (2008)

Official URL: <Go to ISI>://WOS:000259802400017

Abstract

Diffusive diffraction patterns may be useful for probing the local environment of diffusing molecules in materials with geometrically ordered microstructure. A model system consisting in a bundle of waterfilled 100 mu m glass capillaries was probed with volume-selective stimulated echo (STEAM) MRS on a 7T Bruker PharmaScan tomograph with variable diffusion times for both, parallel and perpendicular diffusion-weighting with respect to the capillaries' axes. The precise orientation of the capillaries was determined with image processing methods. Echo attenuation curves were numerically evaluated with respect to the inner radius of the capillaries R and the diffusion coefficient D using equations given in the literature. Good agreement was found between simulation and experiment. For perpendicular diffusion-weighting and diffusion times in the order of R-2/D two diffraction minima were observed which were not present for shorter diffusion times and for parallel diffusion-weighting. In conclusion, volume-selective diffusive diffraction was observed with a standard small-animal tomograph. (C) 2008 Elsevier Inc. All rights reserved.

Item Type: Article
Erschienen: 2008
Creators: Gedat, E. and Buntkowsky, G. and Braun, J.
Title: Diffusive diffraction observed with volume-selective STEAM MRS in 100 mu m water-filled capillaries
Language: German
Abstract:

Diffusive diffraction patterns may be useful for probing the local environment of diffusing molecules in materials with geometrically ordered microstructure. A model system consisting in a bundle of waterfilled 100 mu m glass capillaries was probed with volume-selective stimulated echo (STEAM) MRS on a 7T Bruker PharmaScan tomograph with variable diffusion times for both, parallel and perpendicular diffusion-weighting with respect to the capillaries' axes. The precise orientation of the capillaries was determined with image processing methods. Echo attenuation curves were numerically evaluated with respect to the inner radius of the capillaries R and the diffusion coefficient D using equations given in the literature. Good agreement was found between simulation and experiment. For perpendicular diffusion-weighting and diffusion times in the order of R-2/D two diffraction minima were observed which were not present for shorter diffusion times and for parallel diffusion-weighting. In conclusion, volume-selective diffusive diffraction was observed with a standard small-animal tomograph. (C) 2008 Elsevier Inc. All rights reserved.

Journal or Publication Title: Solid State Nuclear Magnetic Resonance
Volume: 34
Number: 1-2
Uncontrolled Keywords: diffusive diffraction restricted diffusion mrs volume-selection microstructure molecular self-diffusion nmr diffusion restricted diffusion spin-echo spectroscopy simulations relaxation transport liquids solids
Divisions: 07 Fachbereich Chemie > Physical Chemistry
07 Fachbereich Chemie
Date Deposited: 27 Oct 2014 20:50
Official URL: <Go to ISI>://WOS:000259802400017
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