PL EN


Preferences help
enabled [disable] Abstract
Number of results
2008 | 113 | 5 | 1517-1522
Article title

Nanopores in Silica Aerogels

Content
Title variants
Languages of publication
EN
Abstracts
EN
The size of nanopores in thermally treated samples of silica aerogels was determined by ortho-positronium lifetime measurements at room temperature. The annealing of samples in the temperature region of 300-800°C does not make substantial changes in pore size felt by positronium. The annealing at higher temperatures from an interval of 800-1050°C causes shrinkage of the samples reducing the pore size to 1-15 nm. The macropores vanish at temperature treatment at 1000°C and the positron annihilation is not affected by oxygen from air.
Keywords
EN
Contributors
author
  • Institute of Physics of SAS, Dúbravská cesta 9, 854 11 Bratislava, Slovakia
author
  • Institute of Physics of SAS, Dúbravská cesta 9, 854 11 Bratislava, Slovakia
author
  • Institute of Physics of SAS, Dúbravská cesta 9, 854 11 Bratislava, Slovakia
author
  • Institute of Physics of SAS, Dúbravská cesta 9, 854 11 Bratislava, Slovakia
author
  • Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina CH-2, 842 15 Bratislava, Slovakia
author
  • Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská Dolina CH-2, 842 15 Bratislava, Slovakia
References
  • 1. S.J. Tao, J. Chem. Phys. 56, 5499 (1972)
  • 2. M. Eldrup, D. Lightbody, J.N. Sherwood, Chem. Phys. 63, 51 (1981)
  • 3. H. Nakanishi, Y.C. Jean, Positron and Positronium Chemistry, Elsevier, Amsterdam 1988
  • 4. K. Ito, H. Nakanishi, Y. Ujihira, J. Phys. Chem. B 103, 4555 (1999)
  • 5. T.L. Dull, W.E. Frieze, D.W. Gidley, J.N. Sun, A.F. Yee, J. Phys. Chem. B 105, 4657 (2001)
  • 6. D.W. Gidley, K.A. Marko, A. Rich, Phys. Rev. Lett. 36, 395 (1976)
  • 7. T. Goworek, K. Ciesielski, B. Jasinska, J. Wawryszczuk, Chem. Phys. Lett. 272, 91 (1997)
  • 8. D.W. Gidley, W.E. Frieze, T.L. Dull, A.F. Yee, E.T. Ryan, H.M. Ho, Phys. Rev. B 60, R5157 (1999)
  • 9. Y.C. Jean, H. Shi, J. Non-Cryst. Solids 172-174, 806 (1994)
  • 10. G. Consolati, J. Chem. Phys. 117, 7279 (2002)
  • 11. M.V. Félix, R.A. Rodríguez-Rojas, J. Castaneda-Contreras, R. Morones, V.M. Castano, Opt. Mater. 27, 1291 (2005)
  • 12. R. Zaleski, Positronium Lifetime vs. Temperature and Free Volume Size Tables. Pick-Off Model Calculations, Institute of Physics, Maria Curie-Skłodowska University, Lublin 2002
  • 13. I.R. Boyko, M.A. Ignatenko, K. Esenak, L. Kuchta, J. Ružička, V. Fainor, Nucl. Instrum. Methods Phys. Res. A 363, 568 (1995)
  • 14. J. Kansy, Nucl. Instr. Methods Phys. Res. A 374, 235 (1996)
  • 15. K. Cieselski, A.L. Dawidowicz, T. Goworek, B. Jasinska, J. Wawryszczuk, Chem. Phys. Lett. 289, 41 (1998)
  • 16. C. Hugenschmidt, U. Holzwarth, M. Jansen, S. Kohn, K. Maier, J. Non-Cryst. Solids 217, 72 (1997)
  • 17. B. Himmel, Th. Gerber, H. Burger, G. Holzhutter, A. Olbertz, J. Non-Cryst. Solids 186, 149 (1995)
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv113n533kz
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.