Free release static coating of glass capillary columns; rapid coating at lower temperatures and elevated pressures

✍ Scribed by Xu, B. ;Vermeulen, N. P. E.

• Publisher: John Wiley and Sons
• Year: 1985
• Tongue: English
• Weight: 404 KB
• Volume: 8
• Category: Article
• ISSN: 0935-6304
• DOI: 10.1002/jhrc.1240080405

✦ Synopsis

Thecoating speed upon staticcoating of glasscapillarycolumns was evaluated in terms of inner diameter and length of the column, viscosity and pressure of solvent vapor, etc. From the equation obtained it can be shown that a smaller diameter of a microbore column restricts solvent vapor transfer to the orifice of the column drastically. To compensate for this restriction, a higher pressure at the meniscus is needed. As an alternative to using a higher coating temperature, application of more volatile solvents such as n-butane and isobutane is proposed. Several glass capillary columns (130 vm i.d.) were coated with SE-54 dissolved in pentane-acetone mixed with n-butane or isobutane and the column performances were evaluated. Selection of these solvents permitted free release static coating of ca. 100 pm columns at lower oreven ambient temperatures and they were equally suitable as commonly applied solvents (e.g. pentane) to coat highly efficient columns.