Wettability and surface charge of Si3N4-bioglass composites in contact with simulated physiological liquids

• Tipo: Artigo em Revista Científica Internacional
• Data: 2002

Autores

M. Amaral (Autor) Outra; Maria Ascensão Lopes (Autor) FEUP; José D. Santos (Autor) FEUP; R. F. Silva (Autor) Outra

Revista

Título: Biomaterials

Vol. 23 Nº 24

Páginas: 4123-4129

ISSN: 0142-9612

Editora: Elsevier

Indexação

ISI Web of Knowledge - 39 Citações

ISI Web of Science

Scopus - 43 Citações

COMPENDEX

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Biotecnologia ambiental

Outras Informações

ID Authenticus: P-000-MRX

DOI: 10.1016/s0142-9612(02)00155-2

Abstract (EN): Wettability and surface charge studies were performed on a novel Si3N4-30 wt% bioglass biocomposite. Contact angle and surface tension variation with time were determined at 25 degreesC, respectively, by the sessile and pendant drop techniques, for distinct testing liquids: water, diiodomethane, simulated body fluid (SBF) and bovine serum albumin (BSA) dissolved in SBF solution. This biocomposite revealed a hydrophilic character (theta = 26.6 +/- 2.0degrees) and a surface tension value (66.6 mJ m(-2)) comparatively higher than those of the most common bioceramics. An important characteristic is the high work of adhesion towards SBF+BSA (96.4+/-0.2 mJ m(-2)) that was measured. The Si3N4-bioglass material is negatively surface charged above the pH(IEP)=2.5 in aqueous SBF+BSA solution, as a result of the presence at the surface of unsaturated Si-O bonds and Si-OH groups. The very high negative zeta potential at pHsimilar to7 (-58.6+/-5.5mV) influenced albumin adsorption and mechanisms are discussed in terms of entropy and enthalpy gains from conformational unfolding and cations coadsorption.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7