Surface treatment of glass capillaries for gas-chromatography

SummaryA deactivation procedure is described based on a published method using hexamethyldisilazane in the gas phase. In addition to unusually high inertia and thermostability, the method produces truly neutral columns which allow simultaneous analysis of moderately strong free acids and bases. The silylated columns show their full potential only with on-column injection. Preliminary experimental directions are given; more elaborate directions will become available after extended optimization work.

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“…The ends are sealed in a flame under vacuum. The filled tubing is heated to 140-1 50' for about 12 hours. The HCI solution is flushed with water.…”

Section: Leaching the Raw Tubingmentioning

confidence: 99%

Deactivation of glass capillary columns by silylation. Part 1: Principles and basic technique

Grob¹,

Grob²

1979

J. High Resol. Chromatogr.

197

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“…We haveampleevicenceforthe ideathat maximum inertness is based on the maximum achievable density of silyl ether groups. We believe that the difference between persilylation and classical silylation [3] lies in the density of the organic layer.…”

Section: The Structure Of the Persilylated Glass Surfacementioning

confidence: 98%

Persilylation of glass capillary columns. Part 4: Discussion of parameters

Grob

1980

J. High Resol. Chromatogr.

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SummaryPersilylated glass capillary columns are the most universal GC columns available. They are relatively easy to prepare, but there is nevertheless a great need for helpful practical instructions. In the recent literature, methodsand conditionsforthe preparation of persilylated columns have been recommended, but these might confuse the individual column maker, since they seem to originate from limited observations rather than from comprehensive investigation. They will hardly help to make column preparation safer. This paper attempts a summarized view of the present experience with persilylation and provides basic information for column makers.

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“…The "physical" modifications of the glass wall still of importance today, start, as stated above, with the paper of Novotny and Jesarik [13] using hydrochloric acid etching. There are several procedures to do this: the source or the generation of the dry hydrochloric acid gas can be varied; so too can temperature (300 to 5000) and the length of the treatment (3 h to overnight).…”

Section: A Hydrochloric Acid Etchingmentioning

confidence: 99%

Surface modification in glass capillary gas chromatography

Verzele

1979

J. High Resol. Chromatogr.

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Surface treatment of glass capillaries for gas-chromatography

Cited by 105 publications

References 3 publications

Deactivation of glass capillary columns by silylation. Part 1: Principles and basic technique

Deactivation of glass capillary columns by silylation. Part 1: Principles and basic technique

Persilylation of glass capillary columns. Part 4: Discussion of parameters

Surface modification in glass capillary gas chromatography

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