- Tytuł:
- Controlled Porosity of MCM-41 Obtained by Partial Blocking of Pores by Silicon Oil
- Autorzy:
-
Gorgol, M.
Krasucka, P.
Goworek, J.
Zaleski, R. - Powiązania:
- https://bibliotekanauki.pl/articles/1033928.pdf
- Data publikacji:
- 2017-11
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
78.70.Bj
36.10.Dr
61.43.Gt
68.43.-h - Opis:
- Partial blocking of mesopores in the ordered MCM-41 silica by DC550 silicon oil was proposed as a preparation method of the material with controlled porosity and fixed pore size. The porosity of the samples with various content of DC550 was examined with the use of low temperature nitrogen sorption and positron annihilation lifetime spectroscopy. It was shown that the oil blocks the primary pores by forming the plugs near its entrances, but also partially locates in the interparticle spaces. The comparison of the results obtained from both investigation techniques was used to make the first attempt to obtain the calibration of ortho-positronium intensity, depending on pore volume. This is necessary to improve the utility of positron annihilation lifetime spectroscopy as a porosimetric technique. The need to take the migration of positronium to larger free volume into account is discussed.
- Źródło:
-
Acta Physica Polonica A; 2017, 132, 5; 1559-1563
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł