Effect of cetyltrimethylammonium bromide coatings on indium tin oxide surfaces in reverse mode polymer dispersed liquid crystal films
Effect of cetyltrimethylammonium bromide coatings on indium tin oxide surfaces in reverse mode polymer dispersed liquid crystal films
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DOI：
10.1080/02678292.2013.869626
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发表时间：
2014-03
期刊：
影响因子：
2.2
通讯作者：
J. Lee;Sungchul Baek;Joon-Ki Kim;S. Choi;F. Ahmad;M. Jamil;Y. Jeon
中科院分区：
文献类型：
--
作者：
J. Lee;Sungchul Baek;Joon-Ki Kim;S. Choi;F. Ahmad;M. Jamil;Y. Jeon
在十六烷基三甲基溴化铵（CTAB）涂覆的氧化铟锡（ITO）玻璃上的液晶（LC）的垂直取向是LC、CTAB和ITO表面之间的特定相互作用的结果。CTAB的浓度影响液晶取向，从而改变ITO的表面能。用Owens-Wendt方法研究了CTAB涂覆ITO玻璃表面能的变化。随着CTAB浓度的增加，ITO表面上的极性和色散成分能量都降低，并在0.002%CTAB附近达到饱和。CTAB层的存在减少了LC和ITO表面之间的物理化学相互作用，这诱导了具有正或负介电各向异性的LC的垂直取向。垂直对齐确认使用交叉偏振器和晶体旋转方法。所制备的反向模式聚合物分散液晶薄膜的电光特性显示：Ton：29.7%，Toff：85%，响应时间τon：33 ms，τoff：107 ms。
The vertical alignment of liquid crystals (LCs) on cetyltrimethylammonium bromide-coated (CTAB-coated)indium tin oxide (ITO) glass is the consequence of specific interactions between the LCs, CTAB and ITO surface. The CTAB concentration influences the LC orientation, which changes the ITO surface energy. Changes in the surface energy of CTAB-coated ITO glass are investigated by the Owens–Wendt method. Both polar- and dispersive-component energies on the ITO surface decrease as the CTAB concentration increases, and reach saturation around 0.002% CTAB. The physico-chemical interaction between the LCs and the ITO surface was diminished by the presence of the CTAB layer, which induced the vertical alignment of LCs having positive or negative dielectric anisotropy. Vertical alignment is confirmed using crossed polarisers and the crystal rotation method. The electro-optical properties of fabricated reverse mode polymer dispersed liquid crystal films display transmittance of Ton: 29.7%, Toff: 85% and a response time of τon: 33 ms, τoff: 107 ms.