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  Immobilization of stationary liquids on silica particles by γ-radiation

Schomburg, G., Köhler, J., Figge, H., Deege, A., & Bien-Vogelsang, U. (1984). Immobilization of stationary liquids on silica particles by γ-radiation. Chromatographia, 18, 265-274. doi:10.1007/BF02270562.

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Genre: Journal Article

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 Creators:
Schomburg, G.1, Author              
Köhler, J.1, Author
Figge, H.1, Author
Deege, A.1, Author              
Bien-Vogelsang, U.1, Author
Affiliations:
1Service Department Schomburg (GC), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445628              

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Free keywords: New reversed stationary LG-phases; Crosslinking of oligomers by γ-radiation; Shielding of silanol-groups; Surface deactivation; Characterization methods
 Abstract: Continuing our work on new silanization reagents for producing chemically-modified small-particle, silica support material exhibiting improved chromatographic performance and especially good shielding of silanol groups in respect of solute-stationary phase interaction, we have developed new silica-based polymer phases with different “polarities” by crosslinking or polymerization reactions induced by γ-radiation. Polybutadienes or polysiloxanes were immobilized on non-, or specially presilanized, 5μm silica particles by using different dose-rates of γ-radiation and by addition of different amounts of allylmethacrylate as a radical stabilizer. The materials obtained were tested by elemental analysis, scanning electron microscopy, ESCA and IR-reflexion measurements as well as by chemical Si−OH determinations. Chromatographic testing has been carried out with different, especially strongly basic solutes, under normal and reversed phase conditions. The dual retention mechanism model of Nahum and Horvath [1] was applied to the usual commercially available phases and those phases produced by ourselves. The influences of mobile phase additives such as acetonitrile or tetrahydrofuran were also investigated following the chromatographic test procedures for characterization of the support materials synthesized. The silicas obtained show excellent long term stability to all types of HPLC solvents. Their inertness with respect to irreversible adsorption of polar, especially basic, compounds can only be compared with that of reticular bulk polymer stationary phases without any silica skeleton. Unlike pure polymer particles these materials exhibit high pressure stability, only moderate shrinking and swelling effects, and most importantly, high plate numbers, comparable with normal brushtype stationary phases.

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Language(s): eng - English
 Dates: 1984-05-01
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1007/BF02270562
 Degree: -

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Title: Chromatographia
  Abbreviation : Chromatographia
Source Genre: Journal
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Publ. Info: Braunschweig, Germany [etc.] : Pergamon
Pages: - Volume / Issue: 18 Sequence Number: - Start / End Page: 265 - 274 Identifier: ISSN: 0009-5893
CoNE: https://pure.mpg.de/cone/journals/resource/954925390267