title: Hydrodynamic chromatography for the size classification of micron and sub-micron sized packing materials.
abstract: Hydrodynamic chromatography (HDC) was used as a size classification and purification method for porous bridged ethyl hybrid (BEH) packing materials (particles) in the micron to sub-micron range. Using packed column HDC, a batch of particles with size 0.76+/-0.26microm was fractionated to yield classified material of 1.05+/-0.16microm, reducing the relative standard deviation from 33% to 15%. Subsequent chromatographic evaluation of this packing material showed significant improvement in column performance and decrease in flow resistance over the unclassified material. Comparing a column packed with the classified versus non-classified material, the effective flow resistance of the two columns was decreased by 58% and the minimum HETP for the packing material was improved from 4 to 2.5microm.
authors.affiliation: Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA.
authors.forename: J Will
authors.initials: JW
authors.lastname: Thompson
authors.forename: Rachel A
authors.initials: RA
authors.lastname: Lieberman
authors.forename: James W
authors.initials: JW
authors.lastname: Jorgenson
mesh_terms: D002853:Chromatography, Liquid / Q000295:instrumentation* / Q000379:methods; D010316:Particle Size; D012117:Resins, Synthetic / Q000737:chemistry*
chemical_list: D012117:Resins, Synthetic