Indication of ferroelectricity in columnar mesophases of pyramidic molecules
Indication of ferroelectricity in columnar mesophases of pyramidic molecules
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DOI：
10.1080/026782997209379
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发表时间：
1997-03-01
期刊：
影响因子：
2.2
通讯作者：
Chen, XH
中科院分区：
文献类型：
--
作者：
Jakli, A;Saupe, A;Chen, XH
我们合成并研究了带有六个手性侧链的三苯并环壬烯。它们是具有柱状中间相的半固态分子。研究了该手性化合物的光学和电光效应。通过在直流电场存在下冷却十八烷基三乙氧基硅烷处理的板之间的膜来实现柱状相的垂面排列。在电场反转时，观察到这些薄膜的瞬态光学效应。同时，在流过样品的电流的时间依赖性中存在峰值。观察表明，柱状相是铁电体，极化方向平行于光轴。在清亮点以下几度，极化反转的时间在秒的范围内，极化的幅度为10 mCm（-2）。电诊所的效果，观察与风扇纹理的电影。
We have synthesized and studied trisbenzocyclononenes carrying six chiral side chains. They are pyramidic shaped molecules exhibiting columnar mesophases. The optical and electro-optical effects of this chiral pyramidic compound have been studied. A homeotropic alignment of the columnar phase was achieved by cooling the film between plates treated with octadecyltriethoxysilane in the presence of a d.c. field. A transient optical effect was observed with these films on electric field reversal. Simultaneously there was a peak in the time dependence of the electric current flowing through the sample. The observations indicate that the columnar phase is ferroelectric with the polarization parallel to the optical axis. A few degrees below the clearing point, the time for polarization reversal is in the range of seconds and the magnitude of the polarization is 10 mC m(-2). An electroclinic effect was observed for films with fan textures.