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15. Comparison of performance of high-performance liquid chromatography columns packed with superficially and fully porous 25mu m particles using kinetic plots

Author

Fanigliulo, A., Deirdre Cabooter, Bellazzi, G., Tramarin, D., Allieri, B., Rottigni, A., Gert Desmet, Chemical Engineering and Industrial Chemistry, and Chemical Engineering and Separation Science

Subjects
separation science
Abstract

Comparison of performance of high-performance liquid chromatography columns packed with superficially and fully porous 2.5 mu m particles using kinetic plots

Published
2010

16. Sn on InSb(100)-c(2x8): growth morphology and electronic structure

Author

Magnano E., Cepek C, Gardonio S, Allieri B., Baek I., Vescovo E., Roca L., Avila J., Betti MG, Mariani C., Sancrotti, and M

Subjects
Radiation, Materials science, Morphology (linguistics), Low-energy electron diffraction, Photoemission spectroscopy, chemistry.chemical_element, Crystal growth, Substrate (electronics), Electronic structure, Condensed Matter Physics, Epitaxy, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Crystallography, chemistry, Physical and Theoretical Chemistry, Tin, Spectroscopy
Abstract

The growth morphology of Sn on InSb(100)-c(2x8) has been studied by means of Photoemission Spectroscopy (PES), and Low Energy Electron Diffraction (LEED). The crucial role of the substrate temperature and of the Sn evaporation rate, in order to epitaxially grow Sn in its alpha-phase, has been investigated in detail. By carefully choosing these parameters a high-quality thick film (similar to70 Angstrom) of alpha-Sn has been obtained. The a-Sn surface presents a semimetallic character and a (2x1)-2 domains reconstruction.

Published
2002
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41. Comparison of performance of high-performance liquid chromatography columns packed with superficially and fully porous 2.5 μm particles using kinetic plots.

Author

Fanigliulo A, Cabooter D, Bellazzi G, Tramarin D, Allieri B, Rottigni A, and Desmet G

Subjects
Hydrogen-Ion Concentration, Kinetics, Microscopy, Electron, Scanning, Particle Size, Reproducibility of Results, Spectrophotometry, Ultraviolet, Chromatography, High Pressure Liquid methods
Abstract

A recently introduced 2.5 μm fully porous support (Kromasil Eternity) is compared with three different brands of superficially porous material (Kinetex, Halo and Poroshell 120) by means of the kinetic plot method using pharmaceutical compounds from GlaxoSmithKline as probe molecules. The kinetic plot method immediately shows the range of plate numbers wherein a support performs better than another. Results from experiments carried out at pH 4.5 and 8.0 are presented in order to assess the pH stability of the tested phases. Moreover, since all supports are able to withstand pressures higher than 400 bar, they have been evaluated both on HPLC and UHPLC instrumentation. True average particle sizes were determined by SEM images taken from loose stationary phases. Kinetex outperforms the other columns in HPLC conditions for practically relevant efficiencies, but shows poor packing quality in the 100×2.1-mm format. Kromasil is advantageous for simple and fast separations on short columns both in HPLC and in UHPLC conditions. Halo achieves the highest efficiencies of all columns at the lowest pressure cost and shows a noticeable lower axial diffusion. Poroshell 120 has the best packing quality reproducibility across the tested formats. All columns preserve their performance at high pH.

Published
2010
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