Characterization of silica nanocomposites obtained by sol-gel process using positron annihilation spectroscopy

Journal of Physics and Chemistry of Solids

Volumn 60, Issue 2, 1999, Pages 211-221

  De Sousa, Edésia Martins Barros ^a   De Magalhães, Welington F ^b   Mohallem, Nelcy D S ^b  

^a CENTRO DE DESENVOLVIMENTO DA TECNOLOGIA NUCLEAR   (Brazil)

^b LEAP   (Brazil)

Author keywords

B. Sol gel growth; C. Positron annihilation spectroscopy

Indexed keywords

CATALYSTS; COPPER; DENSIFICATION; DOPING (ADDITIVES); DRYING; ETHANOL; GAS ADSORPTION; HEAT TREATMENT; NANOSTRUCTURED MATERIALS; SILANES; SOL-GELS; SPECTROSCOPIC ANALYSIS;

POSITRON ANNIHILATION SPECTROSCOPY; TETRAETHOXYSILANE;

SILICA GEL;

EID: 0001259723     PISSN: 00223697     EISSN: None     Source Type: Journal    
DOI: 10.1016/s0022-3697(98)00263-7     Document Type: Article

References (17)

1. L.L. Hench, J.K. West, The sol-gel process, Chem. Rev. 9 (1990) 33.
2. C.J. Brinker, G.W. Scherer, Sol-Gel Science. Academic Press, San Diego, CA, 1990, p. 908.
3. M. Toki, S. Miyashita, T. Takeuchi, S. Kanbe, A. Kochi, A large-size silica glass produced by a new sol-gel process, J. Non-Crystalline Solids 100 (1988) 482.
4. J.L. Nogues, W.V. Moreshead, Porous gel-silica, a matrix for optically active components, J. Non-Crystalline Solids 121 (1990) 142.
5. W.W. Adams, S. Kumar, Structure processing of advanced materials, in: D.R. Ulhmann, D.R. Ulrich (Eds.), Conventional and Molecular Composites - Past, Present, and Future, 1st ed., Wiley-Interscience, New York, 1992.
6. 2 catalysts, Appl. Catalysts A: General 117 (1994) 149.
7. A.K. Neyestanaki, N. Kumar, L.E. Lindfors, Catalytic combustion of propane and natural gas over Cu and Pd modified ZSM zeolite catalysts, Appl. Catalysts B: Environmental 7 (1995) 111.
8. F.Th. van de Scheur, et al., Structure-activity relation and ethane formation in the hydrogenolysis of methyl acetate on silica supported copper catalysts, Appl. Catalysts A: General 111 (1994) 77.
9. E. Duval, et al., Magnetic properties of Cu-doped porous silica gels study by magnetic resonances, J. Non-Crystalline Solids 189 (1995) 101.
10. M. Nogami, Y.Q. Zhu, Y. Tohyama, K. Nagaska, Preparation and nonlinear optical properties of quantum-sized CuCl-doped silica glass by the sol-gel process, J. Am. Ceram. Soc. 74 (1991) 240.
11. 2 thin films, J. Am. Ceram. Soc. 77 (1994) 1112.
12. Y.C. Jean, Microchem. J. 42 (1990) 72.
13. R.G. Sousa, R.F.S. Freitas, W.F. Magalhães, Structural characterization of poly(N-isopopylacrylamide) gels and some of their copolymers with acrylamide through positron annihilation lifetime spectroscopy. Polymer, 39 (1998) 3815.
14. D.M. Scharader, Y.C. Jean, Positron and positronium chemistry, in: Studies in Physical and Theoretical Chemistry. Elsevier, Oxford, 1988, p. 57.
15. J.C. Machado, et al., Positronium formation and inhibition in binary solid solutions on Al(III) and Co(III) tris(acetylacetonates), Chem. Phys. 170 (1993) 263.
16. P. Kirkegaard, et al., J. Comp. Comm. 23 (1981) 307.
17. E.M.B. Sousa, Preparação e caracterização de nanocompósitos de sílica dopados com cobre e titânio preparados pelo método sol-gel. Doctorate Thesis. EEUFMG, BeLo Horizonte, Brazil, 1997.