Twenty years of glass capillary columns. An empirical model for their preparation and properties
✍ Scribed by Grob, K.
- Publisher
- John Wiley and Sons
- Year
- 1979
- Tongue
- English
- Weight
- 495 KB
- Volume
- 2
- Category
- Article
- ISSN
- 0935-6304
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✦ Synopsis
Abstract
Both the invention of the capillary drawing machine and the preparation and successful use of the first glass capillary column were achieved by Desty and his group in 1959.
This paper attempts to describe the glass capillary column in a general way, including the spreading of liquid phases of different polarity and solid surfaces with different chemical and geometrical structures, and surface activity (as a source of essential column characteristjcs such as film stability, adsorptive and catalytic activity, acidity, and thermostability). The model is entirely based on experimental evidence. It is shown that today's apolar columns may closely approach ideal performance, such as is conceivable at the present time, while a severe gap still exists between the actual and the ideal characteristics of polar columns. The problem lies in the necessity of using considerably active support surfaces for polar coatings, yielding columns with reduced upper temperature limits, and of restricted suitability concerning the nature of sample. It is hoped that progress in the field of surface roughening may produce an inert support which is wettable by polar phases.