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A study of some deactivation methods for fused silica capillary columns by CP-MAS NMR and capillary gas chromatography

✍ Scribed by Rutten, G. ;de Haan, J. ;van de Ven, L. ;van de Ven, A. ;van Cruchten, H. ;Rijks, J.

Publisher
John Wiley and Sons
Year
1985
Tongue
English
Weight
785 KB
Volume
8
Category
Article
ISSN
0935-6304

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✦ Synopsis

Theeffect of deactivatingafusedsilicasurface bysilylation with 1 ,I ,3,3-tetraphenyl-l,3-dimethylsilazane (TPDMDS), triphenylsilylamine (TPSA), and octamethylcyclotetrasiloxane (D4) and by polydimethylsiloxane degradation (PSD) is studied. Rehydrated, dried, and deactivated Cab-0-Sil M5 samples are used as model materials for 29Si CP-MAS NMR analysis.

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The reaction of Cab-0-Sil, a highly dispersed vitreous quartz, with hexamethyldisilazane (HMDS) was studied in the temperature range 38O-50O0C, using ,' Si solid state NMR and other techniques. Such studies are of importance in view of deactivation procedures of fused silica at high temperatures in