Abstract
Evolved gas analysis has been used in the routine characterization of organically-modified oxides, silicates and phosphates. Titania and kieselguhr, both modified with a bis-amino silane, show similar characteristics. In each case, surface hydrogencarbonates yield CO 2 and H 2O, before the organic species dissociate in two steps. During modification with a mono-amino silane the surface of a borosilicate glass retains three organic layers, two of which are probably hydrogen-bonded. After treating with β-phenylalanine the structure of zirconium phosphate is comprised of pillared layers. During programmed heating the pillars collapse and reactions can occur between the gaseous products, leading to the evolution of a mixture of aromatic compounds.
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