Shear-induced orientational effects in discotic-liquid-crystal micelles.
Shear-induced orientational effects in discotic-liquid-crystal micelles.
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盘状液晶胶束中剪切诱导的取向效应。
DOI：
10.1103/physreve.51.6282
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发表时间：
1995
期刊：
影响因子：
--
通讯作者：
Kumar
中科院分区：
文献类型：
--
作者：
Hammouda;Mang;Kumar
利用小角中子散射研究了全氟辛酸铯（CsPFO）溶致混合物在简单库埃特剪切和振荡剪切作用下的取向有序性。发现盘状液体晶体胶束的取向大多平行于移动的剪切细胞壁（即，垂直）。在近晶相中观察到取向的部分“翻转”，由此可见层状晶体水平取向。振荡剪切产生的取向效应，以及剪切引起的相变边界的移位。还观察到有趣的竞争性“体积”和“壁”效应。
Small angle neutron scattering was used to investigate the orientational ordering of a lyotropic mixture of cesium-perfluoro-octanoate (CsPFO) in water under simple Couette and oscillatory shear. The discotic-liquid-crytstal micelles were found to orient mostly parallel to the moving shear cell walls (ie, vertically). A partial ‘‘flipping’’of the orientation was observed in the smectic phase, whereby lamellae were seen to orient horizontally. Oscillatory shear produced orientational effects as well as shear-induced shifts of the phase transition boundaries. Interesting competing ‘‘bulk’’and ‘‘wall’’effects were also observed.