1) La descarga del recurso depende de la página de origen
2) Para poder descargar el recurso, es necesario ser usuario registrado en Universia

Opción 1: Descargar recurso

Detalles del recurso


The focus of this work is to show the influence of surface charge on the bioactivity of modified collagen fiber surface. Because silica plays an important role on bone mineralization process, silica obtained by a sol-gel process was used as a surface modification agent. Zeta potential (xi) of silica-coated and non-coated samples was measured as a function of pH. It was observed a shift in xi vs. pH. The isoelectric point for silica-coated collagen was 6.8, while that of non-treated sample it was near 10. Pure silica has isoelectric point near 2, and the shift observed indicates that at least part of the silica was incorporated onto the surface during the treatment. The ability of samples exposed to biological simulated fluids (SBF) to form a hydroxyapatite layer has been used to recognize bioactive materials. The pH of these biological solutions is about 7.3. It means that treated samples acquire negative charge when in contact with the biological solution and attract ions like Ca2+, HPO4(2-), and OH- to form HA coatings. Micrographs of chemically treated samples corroborate this assumption. For treated samples, the formation of a coating layer is clear after 5-day immersion in SBF, while pure collagen remains practically unaltered. Fourier Transform Infrared Spectroscopic (FTIR) analyses confirmed that the coating layer has P-O vibration bands near 1060 cm-1 and 600 cm-1 characteristic of hydroxyapatite (HA).

Pertenece a

SciELO Brasil - Scientific Electronic Library Online  


Andrade,Ângela Leão -  Ferreira,José Maria Fontes -  Domingues,Rosana Zacarias - 

Id.: 899652

Idioma: inglés  - 

Versión: 1.0

Estado: Final

Tipo:  text/html - 

Palabras clavecollagen - 

Tipo de recurso: journal article  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

Formatos:  text/html - 

Requerimientos técnicos:  Browser: Any - 

Fecha de contribución: 23-may-2005



Otros recursos del mismo autor(es)

  1. In vitro bioactivity and cytotoxicity of chemically treated glass fibers Samples of a commercial glass fiber FM® (Fiber Max) were used to test the efficacy of a chemical sol...
  2. Mechanical characterisation of porous glass reinforced hydroxyapatite ceramics: Bonelike® In the present study, mechanical properties of porous glass reinforced hydroxyapatite bioceramics we...

Otros recursos de la mismacolección

  1. Erratum (v. 7, n. 4, 2004)
  2. TEM study of a hot-pressed Al2O3-NbC composite material Alumina-based composites have been developed in order to improve the mechanical properties of the mo...
  3. Electrostatic deposition of nanofibers for sensor application This work addresses the formation of nanofibers (with hundred of nanometers) by using electrospinnin...
  4. Mathematical model predicts the elastic behavior of composite materials Several studies have found that the non-uniform distribution of reinforcing elements in a composite ...
  5. Evaluation of mechanical properties of four different carbon/epoxy composites used in aeronautical field Four families of carbon fiber reinforced composites (CFRC) used in aeronautical industry were evalua...

Aviso de cookies: Usamos cookies propias y de terceros para mejorar nuestros servicios, para análisis estadístico y para mostrarle publicidad. Si continua navegando consideramos que acepta su uso en los términos establecidos en la Política de cookies.