| Título: | HIERARCHICALLY POROUS Fe2O3 AND Fe2O3/SiO2 COMPOSITES PREPARED BY CYPRESS TISSUE TEMPLATE WITH ASSISTANCE OF SUPERCRITICAL CO2 |
| Autores: |
Ni, Wei Xu, Qun Jiao, Jian-Xia Liu, Xiaofang Ren, Chenxing |
| Fecha: | 2008-04-30 |
| Publicador: | Bioresources |
| Fuente: |
 |
| Tipo: |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| Tema: | Supercritical carbon dioxide; Wood template; Iron oxide; Silica; Composite; Porous; Hierarchical |
| Descripción: | Hierarchically porous α-Fe2O3 and silica-based Fe2O3 composites (I & II) ranging from nanopores to micrometer-sized pores have been prepared by a nanoscale casting process using cypress wood tissue template in supercritical carbon dioxide (scCO2). These wood-templated Fe2O3 and its SiO2-based composites with special hierarchical but continuous pore size from 9 nm up to 20 μm, were prepared from solution with scCO2’ precursor(s). Different characterization techniques such as SEM, XRD, and N2 adsorption-desorption were used to investigate the morphology and structure of Fe2O3 and its composites in different length scales. The Fe2O3 porous material showed a specific characteristic of being accumulated by Fe2O3 granules in the size range ca. 100–200 nm. The SiO2-based Fe2O3 composites exhibited a BET area of 99–104 m2/g, which was much higher than that of pure Fe2O3; this implies that the silica probably exists in the form of a gel skeleton. |
| Idioma: | Inglés |