- Tytuł:
- Thermal Expansion of Free-Volume in Hexadecane Confined in the Silica Gel Nanopores
- Autorzy:
-
Šauša, O.
Majerník, V.
Illeková, E.
Macová, E.
Berek, D. - Powiązania:
- https://bibliotekanauki.pl/articles/1196177.pdf
- Data publikacji:
- 2014-03
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
68.60.-p
78.67.Rb
78.70.Bj - Opis:
- Temperature dependence of the free-volume of voids in hexadecane (HXD) confined in the 3 nm silica gel pores (Develosil-30) was measured by positron annihilation lifetime spectroscopy. Different amount of HXD was filled into the pores of matrix. The anomalous thermal expansion was observed in the partially filled pores with extremely low filling. The thermal expansion coefficient of free-volume voids in this solidified HXD layer has a negative sign at temperatures below 180 K compared to high- or full-filled pores of silica gel. At these temperatures, the positron annihilation lifetime spectroscopy measurements demonstrate the appearance of a new type of the free volume within HXD which has been interpreted as the cracks in the HXD layer on the inner walls of matrix cavities. The differential scanning calorimetry method confirmed that the processes were enacted within pores and not on the outer surfaces of silica gel grains. In the sample with the extremely low filling, only the one HXD solidification/melting effect connected with confined states is manifested.
- Źródło:
-
Acta Physica Polonica A; 2014, 125, 3; 798-800
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł