Ortho-positronium migration in mesopores of MCM-41, MSF and SBA-3

• Autorzy: Zaleski R. , Błażewicz A. , Kierys A.
• Konferencja: Proceedings of the 40th Polish Seminar on Positron Annihilation PSPA'2012, 13-14 June 2012, Kazimierz Dolny, Poland
• Języki publikacji: EN

Abstrakty

EN

Three materials: MCM-41, MSF and SBA-3 with a very similar pore diameter but different lengths of cylindrical pores were investigated using the nitrogen sorption method and positron annihilation lifetime spectroscopy. The size of primary pores and interparticle spaces obtained by both methods is similar. However, volume ratios between the discussed kinds of pores found by the above-mentioned methods differ significantly. Such discrepancy is the result of both ortho-positronium migration and the inaccessibility of the pores for nitrogen. Comparing the results of nitrogen sorption and positron annihilation lifetime spectroscopy allows us to estimate that connectivity between the primary pores and the interparticle spaces is the highest in MCM-41 and lowest in SBA-3.

Słowa kluczowe

EN

nitrogen adsorption/desorption; porous materials; positron annihilation lifetime spectroscopy (PALS); positronium migration

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2013
• Tom: Vol. 58, No. 1
• Strony: 235--240
• Opis fizyczny: BIbliogr. 30 poz., rys.

Twórcy

autor

Zaleski R.

autor

Błażewicz A.

autor

Kierys A.

• Maria Curie-Skłodowska University, Institute of Physics, Department of Nuclear Methods, 1 M. Curie-Skłodowskiej Sq., 20-031 Lublin, Poland, Tel.: [phone], Fax: [phone],

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