Author/Authors :
Zaleski، نويسنده , , R and Borَwka، نويسنده , , A and Wawryszczuk، نويسنده , , J and Goworek، نويسنده , , J and Goworek، نويسنده , , T، نويسنده ,
Abstract :
The properties of positronium annihilating in the micellar template in MCM-41 materials were investigated. For alkyltrimethylammonium bromide surfactants (Cn=14,16,18) the template interior is liquid-like; the bubble model of positronium, elaborated for bulk liquids, can be applied. The equivalent surface tension is linearly dependent on temperature, like in classic liquids. A very long-lived component in o-Ps lifetime spectrum (≈20 ns) can be ascribed to o-Ps in cracks in the elongated template structure.
