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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Acknowledgments
The authors thank Dr. Sylvia M. Carneiro for the TEM images (Laboratório de Biologia Celular do Instituto Butantã) and for the fruitful discussions. Thanks are due to Mr. Marcelo Nakamura and Prof. Henrique E. Toma for the use of the AFM facility. We also acknowledge the financial support of the FAPESP and CAPES. This research was supported by the CNPq under the RHAE/EMBRACO innovation project agreement (50.5002/2004-3). Special acknowledgments are due to EMBRACO and the researchers Ms. Eng. Fabian Fagoti and Dr. Hannes Fischer.
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Maranhão, S.L.A., Cides da Silva, L.C., Michels, A.F. et al. Structure and Morphology of SBA-15 Thin Films on Different Substrates. Braz J Phys 44, 346–355 (2014). https://doi.org/10.1007/s13538-014-0236-4
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DOI: https://doi.org/10.1007/s13538-014-0236-4