用于显示和光电应用的碳纳米管混合向列液晶

B. Singh, S. Sikarwar, K. Pandey, R. Manohar, M. Depriester, D. Singh
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引用次数: 12

摘要

在本文中,我们研究了分散在小浓度多壁碳纳米管(MWCNTs)中的商用向列相液晶(LC)混合物E7。在均匀排列和垂直排列的LC电池中进行了介电和电光表征。加入MWCNTs后,LC分子的电光响应提高了60%,这是由于复合材料中的旋转粘度降低。MWCNTs起到阻隔离子杂质的作用,在0.05% wt%的分散极限内将离子杂质降低至~ 34.3%。E7 LC的向列-各向同性相变温度(TNI)也向更高的温度移动,导致更有序的向列相。LC-MWCNTs中双折射和取向序参数的增强是由于LC分子与MWCNTs之间的π-π电子叠加。LC-MWCNTs复合材料的优点证明了它们适用于超快向列基光电器件。
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Carbon Nanotubes Blended Nematic Liquid Crystal for Display and Electro-Optical Applications
In this paper, we investigate a commercial nematic liquid crystal (LC) mixture namely E7 dispersed with small concentrations of multi-walled carbon nanotubes (MWCNTs). The dielectric and electro-optical characterizations have been carried out in the homogeneously and vertically aligned LC cells. The electro-optical response of LC molecules has been enhanced by 60% after the addition of MWCNTs, which is attributed to the reduced rotational viscosity in the composites. MWCNTs act like barricades for ionic impurities by reducing them up to ∼34.3% within the dispersion limit of 0.05 wt%. The nematic–isotropic phase transition temperature (TNI) of the E7 LC has also been shifted towards the higher temperature, resulting in a more ordered nematic phase. The enhanced birefringence and orientational order parameter in the LC-MWCNTs are attributed to π-π electron stacking between the LC molecules and the MWCNTs. The outlined merits of the LC-MWCNTs composites evince their suitability for ultrafast nematic-based electro-optical devices.
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