title: Spatially resolved transport properties in radially compressed bead packings studied by PFG NMR.
abstract: 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%.
authors.affiliation: Wageningen Nuclear Magnetic Resonance Centre (WNMRC), Wageningen Agricultural University, The Netherlands.
authors.forename: D
authors.initials: D
authors.lastname: Van Dusschoten
authors.forename: U
authors.initials: U
authors.lastname: Tallarek
authors.forename: T
authors.initials: T
authors.lastname: Scheenen
authors.forename: U D
authors.initials: UD
authors.lastname: Neue
authors.forename: H
authors.initials: H
authors.lastname: Van As
mesh_terms: D002845:Chromatography; D004058:Diffusion; D017352:Echo-Planar Imaging; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D010316:Particle Size; D016062:Porosity; D012822:Silicon Dioxide
chemical_list: D012822:Silicon Dioxide