Preparation and Evaluation of Open Tubular Columns

Glasses with lower working temperatures than silica are prepared by adding metal oxides to the silica during manufacture. Thousands of glasses with a variety of 

Solutions to the above problem are required if efficient open tubular columns are to be prepared. The energy of the smooth glass surface can be increased by chemical 

Etching, a different process to leaching, is performed almost exclusively with soda-lime glass capillaries and results in the formation of a regularly spaced array of sodium chloride crystals on the inner surface of the column. To etch soda-lime capillary columns the dry column is filled with hydrogen chloride gas, then sealed at both ends, and heated 

Surface modification reactions used to improve the wettability of glasses by the stationary phase and to deionize some glasses, result in an increase in the activity of the glass surface. Without subsequent deactivation, colunms coated with nonpolar and moderately polar stationary phases exhibit undesirable chromatographic properties, such as tailing, incomplete elution of polar solutes and in extreme cases, sample 

The efficiency of an open tubular column can be measured in several ways, such as by the plate number (N), the effective plate number (Neff), the plate height (H) or the 

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