Remotely Detected MRI Velocimetry in Microporous Bead Packs

TitleRemotely Detected MRI Velocimetry in Microporous Bead Packs
Publication TypeJournal Article
Year of Publication2011
AuthorsHalpern-Manners N.W, Paulsen J.L, Bajaj V.S, Pines A
JournalJournal of Physical Chemistry A
Date PublishedApr 28
ISBN Number1089-5639
Accession NumberWOS:000289697500039

Many NAIR and MRI methods probe fluid dynamics within macro- and mesoporous materials, but with few exceptions, they report on its macroscopically averaged properties. MRI methods are generally unable to localize microscopic features of flow within macroscopic samples because the fraction of the enclosing detector volume occupied by these features is so small. We have recently overcome this problem using remotely detected MRI velocimetry, a technique in which spatial, chemical, and velocity information about elements of the flow is encoded with a conventional NMR coil and detected sensitively at the sample outflow by a volume-matched microdetector. Here, we apply this method to microporous model systems, recording MRI images that correlate local velocity, spin relaxation, and time-of-flight in microscopic resolution and three spatial dimensions. Our results illustrate that remotely detected MRI is an effective approach to elucidate flow dynamics in porous materials including bead pack microreactors and chromatography columns.

URL<Go to ISI>://WOS:000289697500039
Short TitleRemotely Detected MRI Velocimetry in Microporous Bead Packs
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