Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/3896
Título: | Surface modification tailors the characteristics of biomimetic coatings nucleated on starch-based polymers |
Autor(es): | Oliveira, A. L. Elvira, C. Vásquez, Blanca San Román, J. Reis, R. L. |
Data: | 1999 |
Editora: | Kluwer |
Revista: | Journal of Materials Science: Materials in Medicine |
Citação: | "Journal of Materials Science : Materials in Medicine". ISSN 0957-4530. 10:12 (Dec. 1999) 827-835. |
Resumo(s): | This work describes the influence of surface pretreatments over the nucleation and growth of an apatite layer, formed by a biomimetic process, on which a bioactive glass is used as a precursor of the calcium-phosphate (Ca-P) formation on the materials surface. SEVA-C, a corn starch-based biodegradable blend, was used as substrate. The surfaces were pretreated during various periods by: (i) physical methods, namely ultraviolet radiation (u.v.), and over exposure to ethylene oxide sterilization (EtO); and (ii) chemical methods, namely potassium hydroxide (KOH) and acetic anhydride (CH3CO)2 etchings. The surface modifications, performed before the production of the biomimetic coatings, resulted in a faster formation of Ca-P nuclei during the first stages of SBF immersion, particularly in the case of the KOH etching. In this case, it was possible to observe a decrease in the average surface roughness, as measured by laser profilometry, and an increase of the hydrophilicity of the material, which was evident from a clear increment in the water-uptake ability and quantified by contact angle measurements. With this treatment it was possible not only to reduce the induction period for the formation of a well defined and dense apatite-like layer, as observed by scanning electron microscopy (SEM), but also to improve the adhesion of the Ca-P layer to the substrate, as confirmed by the adhesion strength tests. For all the studied pre-treatments, the composition of the films, analyzed by energy dispersive spectroscopy (EDS) and identified by thin-film X-ray diffraction (TF-XRD), seems to be very similar to that of human bone apatites. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/3896 |
DOI: | 10.1023/A:1008900428325 |
ISSN: | 0957-4530 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | 3B’s - Artigos em revistas/Papers in scientific journals |