| Автор | C R Safinva |
| Автор | E B Sirota |
| Автор | R Plano |
| Автор | R F Bruinsma |
| Дата выпуска | 1990-12-01 |
| dc.description | The authors report on synchrotron X-ray studies of the nematic (N) and the smectic-A (SMA) phases under nonequilibrium 'steady state' shear flow conditions. Under shear, the presence of SMA fluctuations leads to a novel flow-induced fluctuation force on the nematic director n which alters its equation of motion. This leads to rich behaviour where the nematic phase exhibits a sequence of regimes in which the orientational phase space (OPS) explored by n evolves as the N-SMA transition is approached. They directly observe the critical slowing down of the SMA order parameter fluctuations through the X-ray profiles which give the intensity map of the time- and space-averaged OPS traversed by n. The data are consistent with the classical Ericksen-Leslie-Parodi theory of nematodynamics away from the immediate vicinity of the N-SMA transition temperature. Closer in, however, fluctuation effects dominate and a model of critical nematodynamics has to be considered. The experiments demonstrate that synchrotron scattering techniques may be used as effective structural probes of dynamical systems. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | A nonequilibrium synchrotron X-ray study of a liquid crystal phase transition under shear flow |
| Тип | paper |
| DOI | 10.1088/0953-8984/2/S/057 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 2 |
| Первая страница | SA365 |
| Последняя страница | SA371 |
| Аффилиация | C R Safinva; Exxon Res. & Eng. Co., Annandale, NJ, USA |
| Аффилиация | E B Sirota; Exxon Res. & Eng. Co., Annandale, NJ, USA |
| Аффилиация | R Plano; Exxon Res. & Eng. Co., Annandale, NJ, USA |
| Аффилиация | R F Bruinsma; Exxon Res. & Eng. Co., Annandale, NJ, USA |
| Выпуск | S |
