Positron Annihilation Studies of Mesoporous Iron-Molybdenum Modified MCM-41 Silica

• Authors: Z. Surowiec , M. Wiertel , W. Gac , M. Budzyński
• Languages of publication: EN

Abstracts

EN

Iron-molybdenum modified MCM-41 mesoporous materials were obtained by the application of direct hydrothermal method. An incorporation of iron and molybdenum ions in the synthesis stage led to structural changes of the MCM-41 support. With an increasing metals content, cylindrical pores of silica are destroyed. X-ray diffraction investigations indicated that both iron and molybdenum ions were first embedded in the silica walls and then formed highly dispersed species in the pores. The porous structure of the studied samples was examined by means of N_2 adsorption/desorption and PALS methods. The longest-lived o-Ps lifetime component remains constant but its intensity monotonically decreases, except for the sample with the highest metals content. These results indicate that an effect of o-Ps formation inhibition occurs.

Keywords

EN

34.80.Lx; 78.67.Bf; 78.70.Bj; 62.23.Pq; 78.67.Sc

Discipline

• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 78.67.Bf: Nanocrystals, nanoparticles, and nanoclusters
• 62.23.Pq: Composites (nanosystems embedded in a larger structure)
• 78.67.Sc: Nanoaggregates; nanocomposites
• 34.80.Lx: Recombination, attachment, and positronium formation

• Journal: Acta Physica Polonica A
• Year: 2014
• Volume: 125
• Issue: 3
• Pages: 789-792

Dates

published

2014-03

Contributors

author

Z. Surowiec

• Institute of Physics, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

M. Wiertel

• Institute of Physics, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

W. Gac

• Faculty of Chemistry, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

M. Budzyński

• Institute of Physics, M. Curie-Skłodowska University, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

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Identifiers

DOI

10.12693/APhysPolA.125.789