Self-assembly of biaxial ordering and molecular tilt angle of chiral smectic liquid crystals in homeotropically aligned cells investigated using infrared spectroscopy.
Self-assembly of biaxial ordering and molecular tilt angle of chiral smectic liquid crystals in homeotropically aligned cells investigated using infrared spectroscopy.
复制标题
使用红外光谱研究垂直排列单元中手性近晶液晶的双轴排序和分子倾斜角的自组装。
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
J. Goodby
中科院分区：
文献类型：
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作者：
R. Korlacki;A. Fukuda;J. Vij;A. Kocot;V. Görtz;M. Hird;J. Goodby
测量了四种手性液晶样品在同向异性晶胞结构中红外吸收的温度依赖关系。结果表明，用这种方法得到的取向序参数值与X射线衍射法测得的近晶层间距有很大的相似之处，从而得到了准确的分子倾斜角。这对现有的X射线数据解释有重要影响。在许多情况下，建议的方法可以被认为是x射线衍射的一种有价值的替代方法，它提供了关于分子碎片的取向和有序性的额外的、重要的信息。研究发现，如果实验得到的序参数很低，那么分子的双轴性就会非常大。平均苯环平面位于分子倾斜面附近。
Temperature dependences of the infrared absorbance have been measured for the four chiral liquid crystal samples in the homeotropic cell configuration. It is shown that the values of the orientational order parameter obtained using this method exhibit a remarkable similarity to the x-ray diffraction results of the smectic layer spacing and lead to accurate values of the molecular tilt angle. This has important consequences for the existing interpretation of the x-ray data. The proposed method, in many cases, may be considered as a valuable alternative to the x-ray diffraction, giving additional, important information about the orientations and the ordering of the molecular fragments. It is found that if the experimentally obtained order parameter is low, then the molecular biaxiality is exceptionally large. The average phenyl ring plane is found to lie close to the molecular tilt plane.
DOI：
10.1002/9783527671403
发表时间：
1998
期刊：
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影响因子：
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作者：
S. Chandrasekhar
通讯作者：
S. Chandrasekhar