| Revista: | Brazilian journal of physics |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000379524 |
| ISSN: | 0103-9733 |
| Autores: | Maranhao, Silvanna L.A1 Silva, Luis C. Cides da2 Michels, Alexandre F3 Horowitz, Flavio3 Matos, Jivaldo R2 Fantini, Marcia C.A1 |
| Instituciones: | 1Universidade de Sao Paulo, Instituto de Fisica, Sao Paulo. Brasil 2Universidade de Sao Paulo, Instituto de Quimica, Sao Paulo. Brasil 3Universidade Federal do Rio Grande do Sul, Instituto de Fisica, Porto Alegre, Rio Grande do Sul. Brasil |
| Año: | 2014 |
| Periodo: | Ago |
| Volumen: | 44 |
| Número: | 4 |
| Paginación: | 346-355 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental, analítico |
| Resumen en inglés | Well-ordered hexagonal mesoporous silica thin films, SBA-15 type, were synthesized with Pluronic P123 and tetraethyl orthosilicate in a diluted ethanol-hydrochloric acid solution. Films deposited on a broad range of distinct substrates by a sol-gel dip-coating method resulted in transparent and adherent samples. Transmission electron microscopy images revealed, predominantly, well-ordered regions of hexagonal arrays of cylindrical mesopores parallel to the substrate. X-ray reflectivity showed similar lattice parameters for all analyzed films, with a (h00) preferred orientation. The films presented diverse shrinkage susceptibilities, which were tested after different polymer removal procedures. Calcined films have 342 m2 /g surface area, 0.130 cm3 /g pore volume, and 6.8 nm pore diameter. The wetting characteristics of the substrates in water and alcoholic solutions were evaluated. The films showed different structural properties, mostly related to the mean surface roughness of the substrates and to the drying process |
| Disciplinas: | Física y astronomía, Ingeniería |
| Palabras clave: | Física de materia condensada, Ingeniería de materiales, Películas delgadas, Tetraetil ortosilicato, Recubrimiento por inmersión, Sol-gel, Propiedades estructurales |
| Keyword: | Physics and astronomy, Engineering, Condensed matter physics, Materials engineering, Thin films, Tetraethyl orthosilicate, Dip coating, Sol-gel, Structural properties |
| Texto completo: | Texto completo (Ver PDF) |
