SLIDE FORUM 3—BIOMATERIALS I: PDF OnlyHEALY KEVIN E.; DUCHEYNE, PAULASAIO Transactions: July-September 1991 - p M150-M151 Free Abstract X-ray photoelectron spectroscopy (XPS) was used to determine changes in titanium oxide composition, oxide stoichiometry, and adsorbed surface species as a function of exposure to model physiologic environments. The oxide on titanium became heterogeneous and polarized as a function of exposure. Changes included an increase in surface hydroxyl groups, and adsorption of H2PO4− and HPO42-. The heterogeneous nature of the surface led to preferential adsorption of lipoproteins, glycolipids, or both from serum. ©1991 American Society of Artificial Internal Organs