A NEW DIRECTOR ALIGNMENT FOR DROPLETS OF NEMATIC LIQUID-CRYSTAL WITH LOW BEND-TO-SPLAY RATIO
A NEW DIRECTOR ALIGNMENT FOR DROPLETS OF NEMATIC LIQUID-CRYSTAL WITH LOW BEND-TO-SPLAY RATIO
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DOI：
10.1080/00268948808078738
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发表时间：
1988-01-01
影响因子：
0.7
通讯作者：
DRZAIC, P
中科院分区：
文献类型：
--
作者：
DRZAIC, P
报道了在向列型液滴中首次观察到的新定向。这个方向由向列指向场组成，向列指向场围绕一个穿过液滴中心的中心核心同心排列，向列指向场在液滴表面呈切向排列。结果表明，对于切向壁面排列，液滴是轴向排列还是双极排列与向列的k33/k11比值相关，且偏向轴向排列的比值较低。本文给出了这种偏好的定性论证。观察到，通过将轴向液滴放置在固体聚合物宿主中来扭曲液滴，也会扭曲液滴内的定向场和中心核心。在一个电场的作用下，聚合物薄膜中轴向排列的液滴可以被强迫进入双极排列。讨论了核心缺陷的性质，并提出了它是真正的线缺陷的论点。
The first observation of a new director orientation within nematic droplets is reported. This orientation consists of the nematic director field arranged concentrically around a central core running through the center of the droplet, with tangential alignment of the nematic at the droplet surface. It is shown that for tangential wall alignments, the observation whether a droplet adopts the axial alignment or the previously reported bipolar droplet alignment is correlated with thek33/k11ratio of the nematic, with a low ratio favoring the axial alignment. A qualitative argument for this preference is given. It is observed that distorting an axial droplet by placing it in a solid polymer host also distorts the director field and central core within the droplet. Droplets in the axial alignment in a polymer film can be forced into the bipolar alignment by the application of an electric field. The nature of the central core defect is discussed, with arguments made that it is a true line defect.