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http://acervodigital.unesp.br/handle/11449/33618
- Title:
- Study of structural surface modified tin oxide membrane prepared by sol-gel route sintered at 400 degrees C
- Universidade Estadual Paulista (UNESP)
- Univ Paris 11
- CNRS
- 0928-0707
- This work describes the chemical modification by Tiron(R) molecules of the surface of SnO2 nanoparticles used to prepare nanoporous membranes. Samples prepared with Tiron(R) content between 1 and 20 wt% and fired at 400 C were characterised by X-Ray Powder Diffraction (XRPD), Extended X-ray Absorption Fine Structure (EXAFS), N-2 adsorption isotherms analysis and permeation experiments. XRPD and EXAFS results show a continuous reduction of crystallite size by increasing the Tiron(R) contents until 7.5 wt%. The control exercised by Tiron(R) modifying agent in crystallite growth allows the fine tuning of the average pore size that can be screened from 0.4 to 4 nm as the amount of grafted molecules decreases from 10 to 0 wt%. In consequence, the membrane cut-off can be screened from 1500 to 3500 g.mol(-1).
- 1-Jan-2003
- Journal of Sol-gel Science and Technology. Dordrecht: Kluwer Academic Publ, v. 26, n. 1-3, p. 171-175, 2003.
- 171-175
- Kluwer Academic Publ
- ceramic membranes
- surface modification
- ultrafiltration
- porosity
- http://dx.doi.org/10.1023/A:1020778411051
- Acesso restrito
- outro
- http://repositorio.unesp.br/handle/11449/33618
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