Highly porous silica networks derived from gelatin/siloxane hybrids prepared starting from sodium metasilicate
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Highly porous silica networks derived from gelatin/siloxane hybrids prepared starting from sodium metasilicate
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| Id. |
38184145 |
| Idioma |
inglés
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| Titulo |
Highly porous silica networks derived from gelatin/siloxane hybrids prepared starting from sodium metasilicate |
| Autor(es) |
Retuert de la Torre, Jaime
Martínez, Y.
Quijada, R.
Yazdani-Pedram, M.
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| Localización |
JOURNAL OF NON-CRYSTALLINE SOLIDS 347(1-3):273-278
0022-3093
http://hdl.handle.net/2250/5282
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| Versión |
1.0 |
| Estado |
Final
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| Descripción |
The formation of polymeric hybrid materials of siloxanes with gelatin (GE) starting from sodium metasilicate as the silica source, and their transformation into silica under different conditions have been studied. Gelatin/silicate hybrid nanocomposites were obtained by acid precipitation of mixed gelatin and sodium silicate solutions. Porous xerogels with large BET areas (452 m(2)/g) constituted by closed packed microspheres (1 mum diameter) containing residual gelatin in microporous domains were obtained after thorough extraction of gelatin with water from the nanocomposites. By calcination at 550 degreesC the residual gelatin occluded in the micropores was eliminated and a highly microporous silica (BET area 834 m(2)/g) with microspherical morphology was produced. Blanks were prepared in order to establish the role of GE in the process. Silica samples obtained under the same conditions but without gelatin also have large BET areas but they are mesoporous (40-100 Angstrom), presenting an irregular morphology on a micron scale. The morphological and textural differences between both silica types demonstrate the nanocomposite structure of the hybrids, making evident the templating role of gelatin in the formation of the silica network.
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| Palabras clave |
Metasilicate
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| Tipo de recurso |
Article
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| Tipo de Interactividad |
Expositivo
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| Nivel de Interactividad |
muy bajo
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| Audiencia |
Estudiante
Profesor
Autor
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| Estructura |
Atomic |
| Coste |
no
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| Copyright |
sí
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| Requerimientos técnicos |
Browser: Any
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| Fecha de contribución |
14-nov-2008 |
| Contacto |
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