ABSTRACT
FIG. 15 Infrared spectra of untreated silica gel LiChrosorb SI 100-1 and modified by various dichlorosilanes (2-6) (samples beforehand were evacuated at 200°C to 10-5 Torr and placed in CC14), (2) diphenyldichlorosilane, (3) methylphenyldichlorosilane, (4) dimethyldichlorosilane, (5) methylvinyldichlorosilane, and (6) methyl-f.lphenylethyldichlorosilane. (From Ref. 43.)
In calculating Ka it is necessary to take into consideration that the specific surface area of modified samples decreases because of increasing mass of adsorbent, owing to the attachment of modifying groups at practically the same area of sample. This decrease will be larger for adsorbents with higher specific surface area at the same degree of modification.
