A study of the adsorption activities of silanol surface structures on a fused silica model substrate by combining 29Si CP MAS NMR and inverse gas chromatographic data

A.B. Scholten, J.G.M. Janssen, J.W. Haan, de, C.A. Cramers

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Abstract

The possibilities of inverse gas-solid chromatog. (IGC) in obtaining chromatog. data on fumed silica were examd. Aerosil A-200, a fused silica model substrate in 29Si NMR anal., was trimethylsilylated to different degrees. IGC was used to vary reproducibly det. the free specific energies of adsorption of several functionalized probe solutes. Hydrogen bonding solutes have a free specific energy of adsorption that is at least about 50% higher than that of non-hydrogen bonding probe solutes. NMR was used in combination with elemental anal. to calc. surface concns. of the different chem. surface structures. IGC data and surface concns. were combined in order to det. the contribution of each type of surface structure to the total free specific adsorption energy. It could be concluded that residual silanols from the reaction of dihydroxydisiloxysiloxane (Q2 groups) with trimethylchlorosilane possess a higher adsorption activity than the silanols initially present
Original languageEnglish
Pages (from-to)77-84
JournalJournal of High Resolution Chromatography
Volume17
Issue number2
DOIs
Publication statusPublished - 1994

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