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  • 1
    Electronic Resource
    Electronic Resource
    Deactivation of small-diameter fused-silica capillary columns for gas and supercritical fluid chromatography (1984)
    Springer
    Chromatographia 18 (1984), S. 362-366 
    Details
    ISSN: 1612-1112
    Keywords: Deactivation of columns ; Capillary gas chromatography ; Capillary supercritical fluid chromatography
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary In order to prevent plugging during deactivation of small diameter (50 μm i.d.) capillary columns for gas and supercritical fluid chromatography, various high temperature deactivation methods were employed. Pure hexamethyldisilazane and hexamethyldisiloxane (a substitute for D4) were dynamically coated on the column, while a film (0.05 μm) of OV-101 was statically coated, before high temperature (450°C) treatment. Excellent deactivated columns were obtained, and no significant difference in column activity was observed using any of these three methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02262481
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of column diameter on efficiency in capillary supercritical fluid chromatography (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 312-318 
    Details
    ISSN: 0935-6304
    Keywords: Supercritical fluid chromatography ; Capillary column ; Column diameter ; Efficiency ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fused silica capillary columns with internal diameters from 100 to 25 μm were coated with SE-54 and evaluated under supercritical fluid chromatographic conditions using carbon dioxide as mobile phase. Experimental results compared well with theoretical predictions. At ten times the optimum mobile phase velocity and for a capacity factor, k of 3, efficiencies of 2300 to 5600 plates m-1 were obtained for column diameters of 100 to 25 μm, respectively.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240070605
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of stationary phase film thickness on efficiency in capillary supercritical fluid chromatography (1984)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 7 (1984), S. 423-428 
    Details
    ISSN: 0935-6304
    Keywords: Capillary column ; Supercritical fluid chromatography ; Stationary phase film thickness ; Efficiency ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Fused-silica capillary columns with internal diameters of 50 μm were coated with 0.25 to 1.0 μm films of SE-54 and evaluated under supercritical fluid chromatographic conditions using carbon dioxide as mobile phase. Experimental results compared well with theoretical predictions. There was no significant difference in hmin or ūopt for film thicknesses from 0.25 to 1.0 μm over k = 1 to 5. At a film thickness of 1.0 μm, calculations indicate that approximately 10% resolution loss would be expected for solutes with k = 1.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240070714
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    Paper (German National Licenses)
    Fulltext
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