کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5373299 | 1504208 | 2015 | 6 صفحه PDF | دانلود رایگان |
- Rotator phase in even alkanes CnH2n+2 with n ⩽ 20 appears in mixed samples only.
- Interlamellar gap width is the same for shorter chain alkane concentration x and 1 â x.
- Excess electron trapping diminishes with broadening of alkane chain distribution În.
Binary mixtures of even-numbered normal alkanes CnH2n+2 and Cn+2H2n+6 with n ⩽ 18 were investigated by positron annihilation spectroscopy. Formation of the rotator phase was observed in mixed structures, while no such a phase in neat alkanes in this range of n was found. Phase diagrams for n = 18 and n = 16 are very similar to the diagrams for binary mixtures of odd-numbered alkanes. The effect of positronium formation with trapped excess electrons weakens with decreasing n, at low n values the time constant of Ps rise contains the component much shorter than 1 h.
Journal: Chemical Physics - Volume 458, 8 September 2015, Pages 62-67