Evaluation of wettability and surface energy of native Nitinol surfaces in relation to hemocompatibility

TitleEvaluation of wettability and surface energy of native Nitinol surfaces in relation to hemocompatibility
Publication TypeJournal Article
Year of Publication2013
AuthorsShabalovskaya SA, Siegismund D, Heurich E, Rettenmayr M
Journal TitleMaterials Science & Engineering C-Materials for Biological Applications
Date Published01
Type of ArticleArticle
ISBN Number0928-4931
Accession NumberWOS:000313155500019
Keywordsactivation, alloys, biocompatibility, Contact angle, contact-angle, medical applications, nickel, nitinol, protein adsorption, SHAPE-MEMORY, surface energy, titanium, Wettability, WIRES

In the present study the dependence of Nitinol contact angles and surface energy on surface treatment is explored in order to better understand the material hemocompatibility that was evaluated in our previous studies. It is found that in the group of surfaces: (1) mechanically polished, (2) additionally heat treated, (3) chemically etched, and (4) additionally boiled in water, and (5) further heat treated, the contact angle could vary in the 50 degrees-80 degrees hydrophobic range and the total surface free energy in the 34-53 mN/m range. The polar surface energy, varying from 5 to 29 mN/m, constitutes a decisive contribution to the total energy change, and it seems to be a direct function of the Nitinol surface chemistry. Based on the complex analysis of surface energy together with the earlier results on electrochemistry and hemocompatibility it is concluded that the alteration of the polar component of surface energy and thrombogenicity is due to changes of the electron-acceptor/electron-donor character of native Nitinol surfaces during surface treatments. (c) 2012 Elsevier By. All rights reserved.

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