| Автор | H E King Jr |
| Автор | E B Sirota |
| Автор | H Shao |
| Автор | D M Singer |
| Дата выпуска | 1993-08-14 |
| dc.description | The authors present results of an X-ray scattering study on the rotator phases of normal alkanes: CH<sub>3</sub>-(CH<sub>2</sub>)<sub>n-2</sub>-CH<sub>3</sub> (20<or=n<or=33). These are layered plastic-crystal phases in which the long axes of the molecules are all parallel and can be either parallel to or tilted from the layer normal. They have characterized a new tilted rotator phase and measured the distortion, area per molecule and tilt parameters in all five rotator phases. There is no strong even-odd chain effect within the rotator phases, but there is a significant change in phase sequence in the C<sub>26</sub>-C<sub>27</sub> carbon number region. A typical phase sequence for the shorter chains is L-R<sub>II</sub>-R<sub>I</sub>-R<sub>V</sub>-crystal. For longer chains the sequence is L-R<sub>IV</sub>-R<sub>III</sub>-crystal. In the R<sub>V</sub>, R<sub>IV</sub> and R<sub>III</sub> phases the molecules are tilted. There is a general trend towards decreasing distortion and increasing magnitude of tilt with increasing carbon number. An unusual decrease in area per molecule with increasing temperature for the high-carbon-number phases suggests that defects may play a role in the R<sub>IV</sub> phases. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | A synchrotron X-ray scattering study of the rotator phases of the normal alkanes |
| Тип | paper |
| DOI | 10.1088/0022-3727/26/8B/021 |
| Electronic ISSN | 1361-6463 |
| Print ISSN | 0022-3727 |
| Журнал | Journal of Physics D: Applied Physics |
| Том | 26 |
| Первая страница | B133 |
| Последняя страница | B136 |
| Аффилиация | H E King Jr; Corporate Res. Sci. Labs., Exxon Res. & Eng. Co., Annandale, NJ, USA |
| Аффилиация | E B Sirota; Corporate Res. Sci. Labs., Exxon Res. & Eng. Co., Annandale, NJ, USA |
| Аффилиация | H Shao; Corporate Res. Sci. Labs., Exxon Res. & Eng. Co., Annandale, NJ, USA |
| Аффилиация | D M Singer; Corporate Res. Sci. Labs., Exxon Res. & Eng. Co., Annandale, NJ, USA |
| Выпуск | 8B |
