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  • 1
    Electronic Resource
    Electronic Resource
    Methods for the Modification and Characterization of Oxide Surfaces (1997)
    Springer
    Interface science 5 (1997), S. 103-117 
    Details
    ISSN: 1573-2746
    Keywords: silica ; organosilanization ; hydrosilation ; DRIFT ; CP-MAS NMR ; ESCA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract This paper presents a general overview of the chemical modificationof oxide surfaces with particular emphasis on the silanization/hydrosilationmethod. A number of materials have been synthesized that have hydrophobic,hydrophilic, chiral and liquid crystal surfaces. The most frequently usedoxide in these materials is silica with chromatography as the primaryapplication for the chemically modified oxide surfaces. Also presented is anoverview of a number of methods used to characterize modified oxide surfacessuch as elemental analysis, diffuse reflectance infrared Fourier transformspectroscopy, solid-state NMR, electron spectroscopy for chemical analysis,scanning electron microscopy and atomic force microscopy. The particularadvantages of each method for the characterization of modified oxidematerials are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008648923962
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular shape recognition of polycyclic aromatic hydrocarbons with a liquid-crystal bonded phase in supercritical fluid chromatography (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Microcolumn Separations 3 (1991), S. 417-422 
    Details
    ISSN: 1040-7685
    Keywords: molecular shape recognition ; PAH ; liquid crystal ; SFC ; LC ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chromatographic characteristics of a liquid crystal bonded phase have been evaluated for the separation of polycyclic aromatic hydrocarbons (PAHs), especially focusing on its shape recognition capability in supercritical fluid chromatography (SFC). The results clearly indicate that the phase has a stronger molecular planarity and shape recognition capability than typical polymeric and monomeric octadecylsilica (ODS) phases because of the very ordered bonded phase structure. The recognition capability was slightly dependent on SFC conditions such as column pressure, column temperature, and mobile phase density. Modifier addition did not make a large difference on the recognition capability. The phase seems to be a very promising stationary phase in SFC because the recognition capability is slightly influenced by the SFC conditions. Selectivity enhancement for molecular shape and planarity recognition has been found in SFC compared to reversed-phase LC separations with the same stationary phase.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mcs.1220030506
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Column technology in capillary electrophoresis and capillary electrochromatography (1997)
    Weinheim : Wiley-Blackwell
    Electrophoresis 18 (1997), S. 2228-2238 
    Details
    ISSN: 0173-0835
    Keywords: Surface modifications ; Microchips ; Column packings ; Etching ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: A review of column technology in capillary electrophoresis (CE) including wall modification processes and open tubular as well as packed column formats in capillary electrochromatography (CEC) are presented. There are many approaches which can be used to solve separation problems which provide higher efficiency and/or shorter analysis times in comparison to other chromatographic techniques. However, both CE and CEC are still relatively undeveloped in comparison to a more mature method such as high performance liquid chromatography (HPLC) and improvement in column technology is changing rapidly.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/elps.1150181213
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    Paper (German National Licenses)
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