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Functional Groups on the Surfaces of Solids
Prof. Dr. H.-P. Boehm,
Prof. Dr. H.-P. Boehm
Anorganisch-Chemisches Institut der Universität Heidelberg (Germany)
Search for more papers by this authorProf. Dr. H.-P. Boehm,
Prof. Dr. H.-P. Boehm
Anorganisch-Chemisches Institut der Universität Heidelberg (Germany)
Search for more papers by this authorAbstract
Atoms or groups foreign to the structure of a solid are often bonded to its surface. On diamond, graphite, and even silicon dioxide, the foreign atoms are bonded covalently, whereas the bonding of the structural groups to titanium oxide and alumina is predominantly ionic. Oxides are normally covered with a monomolecular hydroxide layer. Changes in the valence of the metal atoms lead to changes in the acidity of the surface; for example, reduction of surface Ti4+ions gives the surface of TiO2 an acidic nature.
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