ABSTRACT
General Considerations . . . . . . . . . . . . . . . . . . . . . . 645
Preparation of Porous Materials . . . . . . . . . . . . . . . 646
Reactivity of Precursors in Sol-Gel Processes . . 646
Preparation of Materials with Special Functions 648
Conclusions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 651
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . . 651
References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 651
Sol-gel techniques were used to prepare porous, organically modified silica materials. The introduction of
organic groupings was carried out with alkoxysilanes as precursors; methyl and propyl amino groups were
used. The results show that high-porosity materials can be synthesized; the microstructure strongly depends
on reaction conditions such as composition, solvent, catalyst type, and concentration. Microstructure tailor-
ing affects mechanical as well as adsorption properties, and custom-made materials such as abrasives and
adsorbents with special properties were synthesized.
