Chemically selective NMR imaging of a 3-component (solid–solid–liquid) sedimenting system

A novel magnetic resonance imaging (MRI) technique which resolves the separate components of the evolving vertical concentration profiles of 3-component non-colloidal suspensions is described. This method exploits the sensitivity of MRI to chemical differences between the three phases to directly im...

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Bibliographic Details
Published in:Journal of magnetic resonance (1997) 2003-04, Vol.161 (2), p.198-203
Main Authors: Beyea, Steven D, Altobelli, Stephen A, Mondy, Lisa A
Format: Article
Language:English
Subjects:
MRI
Multi-phase
Sedimentation
SPRITE
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Summary:A novel magnetic resonance imaging (MRI) technique which resolves the separate components of the evolving vertical concentration profiles of 3-component non-colloidal suspensions is described. This method exploits the sensitivity of MRI to chemical differences between the three phases to directly image the fluid phase and one of the solid phases, with the third phase obtained by subtraction. 19 F spin–echo imaging of a polytetrafluoroethylene (PTFE) oil was interlaced with 1 H SPRITE imaging of low-density polyethylene (LDPE) particles. The third phase was comprised of borosilicate glass spheres, which were not visible while imaging the PTFE or LDPE phases. The method is demonstrated by performing measurements on 2-phase materials containing only the floating (LDPE) particles, with the results contrasted to the experimental behaviour of the individual phases in the full 3-phase system. All experiments were performed using nearly monodisperse particles, with initial suspension volume fractions, φ i, of 0.1.
ISSN:1090-7807
1096-0856
DOI:10.1016/S1090-7807(02)00172-6