



@article {2532,
	title = {Electrochemical and microstructural studies of tantalum and its oxide films for biomedical applications in endovascular surgery},
	journal = {Journal of Materials Science: Materials in MedicineJ. Mater. Sci. Mater. Med.},
	volume = {13},
	year = {2002},
	note = {Cited By (since 1996): 17Export Date: 21 November 2012Source: ScopusCODEN: JSMMEdoi: 10.1023/A:1014779008598Language of Original Document: EnglishCorrespondence Address: Silva, R.A.; CIEA/ISEP, Rua S. Tom{\'e}, 4200 Porto, PortugalReferences: Sigwart, U., Puel, J., Mirkovitch, V., Joffre, F., Kappenberger, L., (1987) New Engl. J. Med., 316 (12), pp. 701-706;Serruys, P.W., De Jaegere, P., Kiemeneij, F., Macaya, C., Heindrickx, W., (1994) New Engl. J. Med., 331 (8), pp. 489-495; 
Fischman, D.L., Leon, M.B., Baim, D.S., Schatz, R.A., Savage, M.P., Penn, I., (1994) New Engl. J. Med., 331 (8), pp. 496-501; 
Serruys, P.W., Emanuelsson, H., Van Der Giessen, W., Lunn, A.C., Kiemeney, F., Macaya, C., (1996) Circulation, 93 (3), pp. 412-422; 
Cohen, D.J., Breall, J.A., Ho, K.K., Kuntz, R.E., Goldman, L., Baim, D.S., (1995) New Engl. J. Med., 92, pp. 1859-1874; 
Cohen, D.J., Breall, J.A., Ho, K.K., Weintraub, R.M., Kuntz, R.E., Weistein, M.C., (1993) J. Amer. Coll. Cardiology, 22 (4), pp. 1052-1059; 
Cohen, D.J., Krumholz, H.M., Sukin, C.A., Ho, K.K., Siegrist, R.B., Cleman, M., (1995) Circulation, 92, pp. 2480-2487; 
Colombo, A., Hall, P., Nakamura, S., Almagor, Y., Maiello, L., Martini, O., (1995) Circulation, 91 (6), pp. 1676-1688; 
Goy, J.J., Eeckhout, E., Stauffer, J.C., Vogt, P., Kappenberger, L., (1995) Catheter. Cardiov. Diag., 34, pp. 128-132; 
Hamasaki, N., Nosaka, H., Nobuyoshi, M., (1995) J. Amer. Coll. Cardiol., 239 A (SPEC. ISSUE); 
Hamm, C.W., Beythien, C., Sievert, H., Langer, A., (1995) Amer. Heart J., 129 (3), pp. 423-429; 
Kiemeneij, F., Hofland, J., Laarman, G.J., Hupkens Van der Elst, D., Van der Lubbe, H., (1995) Catheter. Cardiov. Diag., 35, pp. 301-308; 
Mehan, V.K., Kaufmann, U., Urban, P., Chatelain, P., Meier, B., (1995) Catheter. Cardiov. Diag., 34, pp. 122-127; 
Robinson, N.M., Thomas, M.R., Jewitt, D.E., Wainwright, R.J., (1995) Cardiology, 7 (6), pp. 156-164; 
Stauffer, J.C., Eeckhout, E., Goy, J.J., Nacht, C.A., Vogt, P., Kappenberger, C., (1995) J. Invas. Cardiol., 7 (8), pp. 221-227; 
Webb, J., Stertzer, S., Ahmad, T., Carere, R., Mercier, B., Dodek, A., (1996) Catheter. Cardiov. Diag., 37, pp. 120-124; 
Sch{\"o}neberger, A.A., Schmidt, K., (1996) New Engl. J. Med., 335 (15), p. 1160; 
Priestley, K.A., Clague, J.R., Buller, N.P., Sigwart, U., (1996) Europ. Heart J., 17 (3), pp. 438-444; 
Silva, R.A., Marques, M.A., Silveira, A., Walls, M., Rondot, B., Guidoin, R., (1998) Proceedings of the 14th European Conference on Biomaterials, p. 37. , The Hague, September, edited by the Dutch Society for Biomaterials; 
Pypen, C.M.J.M., Plenk H., Jr., Ebel, M.F., Svagera, R., Verenisch, J., (1997) J. Mater. Sci. Mater. Med., 8, pp. 781-784; 
Park, J.B., (1984) Biomaterials Science and Engineering, p. 217. , New York, Plenum Press; 
Jonhson, P.F., Bernstein, J.J., Hunter, G., Dawson, W.W., Hench, L.L., (1977) J. Biomed. Mater. Res., 11, pp. 637-656; 
Black, J., (1994) Clin. Mater., 16, pp. 167-173; 
Stackpool, G.J., Kay, A.B., Morton, P., Harvey, E.J., Tanzer, M., Bone, J.D., (1995) Proceedings of Combined Orthopaedic Research Societies Meeting, p. 45. , edited by Orthopaedic Research Society (Rider Dickerson Inc., Chicago); 
Macagno, V.A., Schultze, J.W., (1984) J. Electroanal. Chem., 180, pp. 157-170; 
Schultze, J.W., Macagno, V.A., (1986) Electrochim. Acta, 31, pp. 355-363; 
Kerrec, O., Devilliers, D., Groult, H., Chemla, M., (1995) Electrochim. Acta, 40, pp. 719-724; 
Degryse, R., Gomes, W.P., Cardon, F., Vennik, J., (1975) J. Electrochem. Soc., 122, p. 711; 
Gartner, W.W., (1959) Phys. Rev., 116, p. 84; 
Butler, M.A., (1977) J. Appl. Phys., 48, p. 1914; 
Ginley, D.S., Butler, M.A., (1977) J. Appl. Phys., 48, p. 2019; 
Clechet, P., Martin, J.-R., Olier, R., Vallouy, C., (1976) C. R. Acad. Sci. Paris, 282, pp. 887-890; 
Lohrengel, M.M., (1994) Electrochim. Acta, 39, pp. 1265-1271
},
	month = {2002///},
	pages = {495 - 500},
	abstract = {The most popular coronary stents are made of 316L stainless steel and self-expandable Nitinol. Nevertheless, Ta has already been used to make stents for endovascular surgery and may constitute a good alternative to the other materials because of its higher corrosion resistance and radio-opacity property, which may facilitate the follow-up of stent catheterization. The characterization of Ta and its natural passive oxide films has been performed in a 0.15M NaCl solution (simulated body fluid - SBF) using anodic polarizations, electrochemical impedance spectroscopy and photoelectrochemical techniques. Changes in microstructure have been observed by atomic force microscopy (AFM). Polarization curves show the existence of a current density increase between 1.40 and 1.80V. Bode complex plots show that some perturbation of the film occurred in this potential interval which may be associated with a decrease in polarization resistance, Rp, indicating that the film may be less resistant to corrosive attack. Mott-Schottky capacity measurements show that the density of donors, Nd, varies with polarization. The optical band gap, E                        g, which is equal to 4.1 eV did not show variations in our experiments. The localized formation on the electrode surface, in the above potential interval of a Ta compound (possibly an oxide-hydroxide) was observed by AFM, and this may explain the appearance of the current density peak and capacity behavior at those potentials. {\textcopyright} 2002 Kluwer Academic Publishers.
},
	keywords = {article, Atomic force microscopy, body fluid, coronary stent, Corrosion, Corrosion resistance, Current density, Electric Potential, electrochemical analysis, Electrochemical impedance spectroscopy, electrochemistry, electrode, endovascular surgery, Energy gap, film, heart catheterization, hydroxide, Materials science, metal oxide, Metallic films, Microstructure, nitinol, optical density, Oxide films, Polarization, priority journal, simulation, sodium chloride, Stainless steel, structure analysis, Surgery, Tantalum, Tantalum compounds, tantalum oxide, unclassified drug},
	isbn = {09574530 (ISSN)},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-0036242480\&partnerID=40\&md5=bef47948fb9a8f09f8ea9f6c56db672e},
	author = {Silva, R.A. and Walls, M. and Rondot, B. and Da Cunha Belo, M. and Guidoin, R.}
}
