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Biocompatibility and bio-corrosion resistance of amorphous oxide thin films

Published online by Cambridge University Press:  31 January 2011

P. N. Rojas ,
S. E. Rodil ,
S. Muhl ,
G. Ramírez G.  and
H Arzate
P. N. Rojas
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n, CU, México D.F. 04510, México
S. E. Rodil
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n, CU, México D.F. 04510, México
S. Muhl
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n, CU, México D.F. 04510, México
G. Ramírez G.
Affiliation:
Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior s/n, CU, México D.F. 04510, México
H Arzate
Affiliation:
Laboratorio de Biología Celular y Molecular, Facultad de Odontología, Universidad Nacional Autónoma de México, CU, México D.F. 04510, México
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Abstract

The corrosion resistance of biocompatible materials in body fluids is one of the essential factors in the determination of the lifetime of medical implants. Therefore, it is of great relevance to understand the interface processes that occur when a surface is exposed to body fluids. To this end, amorphous titanium and niobium oxide films were deposited on medical grade stainless steel using a magnetron sputtering system. The biocompatibility of the films was evaluated by adhesion and viability/proliferation assays using human cells, showing non-toxic response. The electrochemical response of the films was evaluated by poteontiodynamic polarization and electrochemical impedance spectroscopy (EIS) as a function of time, up to 500 hrs, using three different simulated body fluids; the NaCl solution and Hartman (Ringer's + Lactate) and Gey's (Ringer's + Phosphates + Glucose) solution. The results indicated that the chemical composition of the solution was very important since different electrochemical behavior was observed for each case. For example, NbOx showed a better resistance than the TiOx films in the Hartman's solution but it failed when Gey's solution was used. Meanwhile TiOx showed a well passivated response for both NaCl and Gey's solution.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1244: Symposium 9 – Biomaterials , 2009 , 4
Copyright
Copyright © Materials Research Society 2009

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