تقرير
Phase-separation of miscible liquids in a centrifuge
| العنوان: | Phase-separation of miscible liquids in a centrifuge |
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| المؤلفون: | Tsori, Yoav, Leibler, Ludwik |
| المصدر: | Comptes Rendus Physique, vol 8, 955 (2007) |
| سنة النشر: | 2007 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Soft Condensed Matter, Condensed Matter - Statistical Mechanics |
| الوصف: | We show that a liquid mixture in the thermodynamically stable homogeneous phase can undergo a phase-separation transition when rotated at sufficiently high frequency $\omega$. This phase-transition is different from the usual case where two liquids are immiscible or where the slow sedimentation process of one component (e.g. a polymer) is accelerated due to centrifugation. For a binary mixture, the main coupling is due to a term $\propto \Delta\rho(\omega r)^2$, where $\Delta\rho$ is the difference between the two liquid densities and $r$ the distance from the rotation axis. Below the critical temperature there is a critical rotation frequency $\omega_c$, below which smooth density gradients occur. When $\omega>\omega_c$, we find a sharp interface between the low density liquid close to the center of the centrifuge and a high density liquid far from the center. These findings may be relevant to various separation processes and to the control of chemical reactions, in particular their kinetics. Comment: 6 pages, 3 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.crhy.2007.09.017 |
| URL الوصول: | http://arxiv.org/abs/0707.2266 |
| رقم الأكسشن: | edsarx.0707.2266 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.crhy.2007.09.017 |
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