Horizontal polymerization of mixed trifunctional silanes on silica. 2. Application to chromatographic silica gel

Journal Article · Mon Mar 15 04:00:00 EST 1993 · Analytical Chemistry (Washington); (United States)

DOI:https://doi.org/10.1021/ac00054a029· OSTI ID:6078345

Wirth, M J; Fatunmbi, H O ^[1]

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1. Univ. of Delaware, Newark (United States)

A new surface bonding scheme for monolayers on silica recently reported was designed to combine the superior hydrolytic stability of self-assembled monolayers with the selectivity and reproducibility of monomeric stationary phases. In this work, the scheme is shown to work very effectively for chromatographic silica gel. A mixture of CH[sub 3](CH[sub 2])[sub 17]SlCl[sub 3] and CH[sub 3](CH[sub 2])[sub 2]SlCl[sub 3] is horizontally polymerized onto 40- and 50-[mu]m-diameter porous silica gel particles. [sup 13]C NMR and microanalysis are used to establish that a coverage consistent with horizontal polymerization is achieved. The chromatographic retention behavior of a set of test solutes is shown to be similar to that for conventional monomeric C[sub 18] phases. The repeated synthesis of the new phase is shown to give reproducible retention times for benzo[a]pyrene and aniline. The hydrolytic stability is demonstrated to be greatly improved over that of a monomeric C[sub 18] stationary phase: the new phase is stable to at least 2,400 column volumes of pH 1.8 solution and stable to at least 900 column volumes of pH 10.0 solution. 20 refs., 6 figs., 3 tabs.

• OSTI ID: 6078345
• Journal Information: Analytical Chemistry (Washington); (United States), Journal Name: Analytical Chemistry (Washington); (United States) Vol. 65:6; ISSN 0003-2700; ISSN ANCHAM
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360600 -- Other Materials
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ADSORBENTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMATOGRAPHY
DISPERSIONS
HYDRIDES
HYDROGEN COMPOUNDS
MINERALS
MIXTURES
ORGANIC COMPOUNDS
ORGANIC SILICON COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
POLYMERIZATION
SEPARATION PROCESSES
SILANES
SILICA
SILICA GEL
SILICON COMPOUNDS
SILICON OXIDES
SURFACE PROPERTIES