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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.49  No.4 (2008)  >  pp.805-811

MATERIALS TRANSACTIONS
<<Previous article Vol.49  No.4 (2008)   pp.805 - 811 Next article>>

Active Hydroxyl Groups on Surface Oxide Film of Titanium, 316L Stainless Steel, and Cobalt-Chromium-Molybdenum Alloy and Its Effect on the Immobilization of Poly(Ethylene Glycol)

Yuta Tanaka1), Haruka Saito2), Yusuke Tsutsumi1), Hisashi Doi1), Hachiro Imai2) and Takao Hanawa1)
1) Institute of Biomaterials and Engineering, Tokyo Medical and Dental University
2) Department of Materials Science, Shibaura Institute of Technology


The concentrations of hydroxyl groups located inside and on the surface oxide films of a commercially pure titanium, cp-Ti, a type 316L austenitic stainless steel, SS, and a cobalt-chromium-molybdenum alloy, Co-Cr-Mo, were evaluated using X-ray photoelectron spectroscopy, XPS, and a zinc-complex substitution technique. As a result, the concentrations of the hydroxyl groups detected by the zinc-complex substitution technique, defined as active hydroxyl groups, were much larger than those detected by other conventional techniques. The concentration of the active hydroxyl groups on Co-Cr-Mo was significantly larger than those on cp-Ti and SS. Poly(ethylene glycol), PEG, is a biofunctional molecule that inhibits the adsorption of proteins. The immobilization of PEG to metal surfaces by electrodeposition or immersion is an important technique to biofunctionalize the metals. The amounts of the PEG layer immobilized on the metals were governed by the concentrations of the active hydroxyl groups on each surface oxide in the case of electrodeposition; it was governed by the relative permittivity of the surface oxide in the case of immersion. The estimation of active hydroxyl groups on the surface oxide film with the zinc-complex substitution technique is useful for the elucidation of reactions between metal substrates and immobilized molecules.


Keyword:
titanium, poly(ethylene glycol), electrodeposition, active hydroxyl groups, X-ray photoelectron spectroscopy

Received: December 10, 2007
Accepted: January 21, 2008 , Published online: March 25, 2008
Copyright (c) 2008 The Japan Institute of Metals

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