Surface modification in glass capillary gas chromatography

Verzele, M.

doi:10.1002/jhrc.1240021102

Cited by 12 publications

(1 citation statement)

References 61 publications

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“…This type of tubing may have considerable advantage with respect to the ability to coat or bond a range of stationary phases onto the tubing inner surface. Research and development is also continuing in the area of preparing whisker-walled OTCs [27,37,[322][323][324][325], New surface treatments and etching methods have been developed for changing the actual surface of a glass that is eventually coated with stationary phase [33,[326][327][328][329][330][331]. Numerous deactivating techniques have also been developed for minimizing adsorptive effects of the glass surface [332][333][334][335][336] and many of these deactivating procedures have been developed for use with the silicone stationary phases which have now been produced in fluid, gum, bonded, or immobilized forms.…”

Section: Brief Description Of Techniques For Preparing Various Types mentioning

confidence: 99%

Aspects of High-Resolution Gas Chromatography as Applied to the Analysis of Hydrocarbon Fuels and Other Complex Organic Mixtures. Volume 1

Rubey¹

1985

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Symmetric elution zone profile 3 Partially disengaged solute zones 4 Block diagram of basic systems approach 5 Three general forms of Chromatographie zone profiles Ig 6 Different combinations of solute zone profiles. 17 7 Rapidly generated chromatogram of a jet fuel. . 8 Chromatogram of a jet fuel obtained with a Pyrex glass open tubular column 9 Gaussian and exponentially modified Gaussian elution zone profiles 10 Series of normal paraffins eluted from a contaminated column 11 Elution behavior after removing contaminated section of column 12 Open tubular column gas chromatograms that exhibit unusual baseline behavior 13 Undesirable quantitative behavior 41 14 Relationship of three-component gas Chromatographie compromises 4 3 15 Relationship of admitted solute versus solute zone variance 44 16 Graphic procedures for measuring solute zone asymmetry 4 6

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Section: Brief Description Of Techniques For Preparing Various Types mentioning

confidence: 99%

Aspects of High-Resolution Gas Chromatography as Applied to the Analysis of Hydrocarbon Fuels and Other Complex Organic Mixtures. Volume 1

Rubey¹

1985

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The use of silicon in the preparation of apolar glass capillary columns

Bertsch

Pretorius

Niekerk

1982

J. High Resol. Chromatogr.

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SummaryAs an extention of previous reports, variables affecting the performance of columns modified by silicon deposition have been optimized. The aim of this work was to produce thermostable apolar glass capillary columns regardless of the glass type used and to maintain column pelformance under stressful conditions. The main parameters studied were the influence of glass type, leaching effects, and silicon layer thickness on column activity. Deactivation and stationary phase conditions were held constant. Both coated and uncoated columns were tested.The thickness of the silicon layer was found to be relatively unimportant. There was no difference whether soft glass or borosilicate glass was used and leaching before silicon deposition did not influence column activity. Bare silicon surfaces showed considerable activity especially in respect to interactions with free acids and bases.There are indications that the surface consists of silicon oxide andotheroxygenatedforrnsof silicon ratherthanof theelement. Treatment of the silicon layers with dilute hydrofluoric acid and the strict exclusion of traces of oxygen and water did not improve the situation. In spite of such specific interactions, silicon surfaces were easily deactivated by heat treatment with polysiloxanes.Silicon surfaces deactivated by baking with octamethyltetrasiloxane at 4000C are inert and temperature stable and show characteristics similar to persilylated surfaces.

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