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Structure and Morphology of SBA-15 Thin Films on Different Substrates |
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| Authors: | Silvanna L A Maranhão Luis C Cides da Silva Alexandre F Michels Flavio Horowitz Jivaldo R Matos Márcia C A Fantini |
| Institution: | 1. Instituto de Física da, Universidade de S?o Paulo, CP 66318, S?o Paulo, SP, 05315-970, Brazil 2. Instituto de Química da, Universidade de S?o Paulo, CP 26077, S?o Paulo, SP, 05599-970, Brazil 3. Instituto de Fisica, UFRGS, Campus do Vale, CP 15051, Porto Alegre, RS, 91501-970, Brazil |
| Abstract: | 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. |
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