title: Performance characteristics of new superficially porous particles.
abstract: Superficially porous particles (also called Fused-Core, core shell or porous shell particles) show distinct advantages over comparable totally porous particles for separating small molecules. Columns of Fused-Core particles exhibit very high efficiency because of superior eddy dispersion properties (smaller van Deemter A term). The efficiency for columns of 2.7 μm Fused-Core particles actually rivals that for sub-2 μm totally porous particles with only about one-half the back pressure. These Fused-Core particles show special advantages with larger molecules for fast separations at high mobile phase velocities because of superior mass transfer (kinetic) properties (smaller van Deemter C term). This report describes the effect of different particle size and porous shell thicknesses on chromatographic performance for Fused-Core particles. Particle characteristics can significantly affect factors of separation importance. For example, the reduced plate height of packed columns is affected by particle diameter. Interestingly, larger Fused-Core particles show smaller reduced plate heights than smaller Fused-Core particles. Also, porous shell thickness has a strong effect on solute retention as well as separation efficiency, and particle surface area has a direct influence on sample loading characteristics. Fused-Core particles with a wide range of physical characteristics have been developed that allows the preparation of stable, efficient packed columns.
authors.affiliation: Advanced Materials Technology, Inc., 3521 Silverside Rd., Ste. 1-K, Quillen Bldg, Wilmington, DE 19810, USA.
authors.forename: Joseph J
authors.initials: JJ
authors.lastname: Destefano
authors.forename: Stephanie A
authors.initials: SA
authors.lastname: Schuster
authors.forename: Jason M
authors.initials: JM
authors.lastname: Lawhorn
authors.forename: Joseph J
authors.initials: JJ
authors.lastname: Kirkland
mesh_terms: D002853:Chromatography, Liquid / Q000295:instrumentation*; D007700:Kinetics; D008863:Microspheres; D010316:Particle Size; D016062:Porosity; D011312:Pressure