PMID: 7526110Jan 1, 1994Paper

A quantitative study of water proton relaxation in packed beds of porous particles with varying water content

Magnetic Resonance Imaging
B P Hills, F Babonneau

Abstract

A quantitative analysis of the dependence of water proton relaxation on water content in randomly packed beds of Sephadex is undertaken. A combination of Osmotic and Capillary theory is used to describe the morphological changes occurring in the packed beds as the water content is lowered. At each water content the water proton relaxation is calculated using a "proton exchange-diffusion" model which takes into account fast chemical exchange between water and dextran hydroxyl protons and the diffusion of water molecules between the water compartments inside and outside the Sephadex beads. The relaxation time distribution are shown to provide a sensitive probe of the air-water distribution in the bed and of the shrinkage of the Sephadex beads at lower water contents. The theoretical models provide an accurate, quantitative description of the relaxation behavior except for the largest beads at high water contents when there is slow diffusion between the water compartments. In this case, a more realistic three-dimensional description of the air-water distribution in a randomly packed bed is required.

References

Jun 3, 1976·Nature·J M HarveyR J Naftalin
Jan 1, 1992·Magnetic Resonance Imaging·S L DuceB P Hills
Apr 1, 1980·Journal of Molecular Biology·E R MorrisG Robinson

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Citations

Jan 1, 1996·Magnetic Resonance Imaging·B P HillsJ E Snaar
Jun 29, 2001·International Journal of Food Microbiology·B P HillsY P Ridge
May 20, 1997·International Journal of Food Microbiology·B P HillsT Brocklehurst
Aug 6, 2014·Magnetic Resonance Imaging·Ping WangJohn C Gore
Dec 3, 2014·Journal of Magnetic Resonance·John T Spear, John C Gore
Oct 4, 2007·Journal of Vascular and Interventional Radiology : JVIR·Julien NamurAlex Laurent
Jul 14, 2012·Magnetic Resonance in Medicine : Official Journal of the Society of Magnetic Resonance in Medicine·Jared Guthrie CobbJohn C Gore
Jan 1, 1994·Magnetic Resonance Imaging·B P Hills, F Babonneau
Nov 19, 2013·Magnetic Resonance Imaging·Jared Guthrie CobbJohn C Gore

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