Aerogel IC3120 Under High Pressure Exerted Mechanically and by Nitrogen

• Authors: M. Gorgol , B. Zgardzińska
• Languages of publication: EN

Abstracts

EN

Highly porous IC3120 silica aerogel was subjected to the high pressure up to 450 MPa while the positron annihilation lifetime spectra were collected. The pressure was delivered to the investigated samples in two ways: by pistons and by gas (nitrogen) penetrating the aerogel. The evolution of all PALS parameters was discussed. With the increase of the pressure, shortening of ortho-positronium lifetimes (different, depending on the pressure method introduced) was observed. Similarity between the dependence of the longest-lived o-Ps component lifetime on the pressure, for the sample affected with nitrogen molecules and pure nitrogen was observed. It suggests, that the nitrogen fills the largest free volumes of the aerogel. The pressure exerted mechanically causes much smaller decrease of free volume available for positronium. The comparison of PALS results with the electron microscopy images, obtained after removing the pressure, confirmed that more intense and lasting changes were caused by affecting the aerogel with the pistons.

Keywords

EN

78.70.Bj; 36.10.Dr; 61.43.Gt; 74.62.Fj

Discipline

• 74.62.Fj: Effects of pressure
• 61.43.Gt: Powders, porous materials
• 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)
• 36.10.Dr: Positronium(see also 82.30.Gg Positronium chemistry)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 132
• Issue: 5
• Pages: 1531-1534

Dates

published

2017-11

Contributors

author

M. Gorgol

• Maria Curie-Sklodowska University, Institute of Physics, Department of Nuclear Methods, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

author

B. Zgardzińska

• Maria Curie-Sklodowska University, Institute of Physics, Department of Nuclear Methods, pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland

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Identifiers

DOI

10.12693/APhysPolA.132.1531