Microscopic order as a function of surface coverage in alkyl-modified silicas: spin probe studies

Abstract

The chemically modified surface plays an important role in retention in reversed-phase liquid chromatography. One surface factor that might affect retention is solute expulsion due to partial ordering of the grafted chains at sufficiently high grafting densities The study has shown by the use of the eletron paramagnetic resonance technique of spin probing that spectroscopic evidence existe for an increaee in molecular order of the bonded octadecyl phase as a function of grafting density