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Preparation of thick-film glass capillary columns by the dynamic coating procedure

✍ Scribed by M. Novotný; K.D. Bartle

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
539 KB
Volume
93
Category
Article
ISSN
1873-3778

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✦ Synopsis

The capacity for non-polar stationary phases of the silanized inner surfaces of glass capillary columns is shown to be restricted to a 2-3 x IO-' m thick film. However, geometrical modification of a soda-glass surface by etching with NC1 gas before silanization allows non-polar silicone-oil films to be prepared with average thickness (in good agreement with those predicted from the Fairbrother-Stubbs relation) as high as 14x 10" m. Such films are stable even after conditioning at 190", and the column efficiencies, near 3000 theoretical plates per meter, were maintained. Van Deemter plots are similar for columns with average film thicknesses between 1 and 14 x 10" m, thus suggesting that the surface developed through the geometrical modification is still covered with a relatively thin film of stationary phase.

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