Spatially resolved transport properties in radially compressed bead packings studied by PFG NMR.
Pulsed field gradient (PFG) multi-echo (ME) and turbo spin-echo (TSE) imaging is used to study dispersive flow in radially compressed chromatographic columns packed with porous silica beads. By using the pulsed field gradient turbo spin-echo sequence spatially resolved displacement imaging can be accelerated by a factor of 16. The positive effect of homogeneous radial packing on flow velocity and dispersion is demonstrated. Small heterogeneities of only a few percent are shown to cause changes of the dispersion coefficient of up to 50%.
Van Dusschoten
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Wageningen Nuclear Magnetic Resonance Centre (WNMRC), Wageningen Agricultural University, The Netherlands.
Tallarek
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U
Scheenen
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Neue
U D
UD
Van As
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D002845:Chromatography; D004058:Diffusion; D017352:Echo-Planar Imaging; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D010316:Particle Size; D016062:Porosity; D012822:Silicon Dioxide
D012822:Silicon Dioxide