Liquid crystal photoalignment using new photoisomerisable Langmuir-Blodgett films
Liquid crystal photoalignment using new photoisomerisable Langmuir-Blodgett films
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DOI：
10.1080/10587250210555
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发表时间：
2002-01-01
影响因子：
0.7
通讯作者：
Ritcey, AM
中科院分区：
文献类型：
--
作者：
Dumont, D;Galstian, TV;Ritcey, AM
介绍了利用光致异构化的Langmuir-Blodgett(LB)取向层研究纯向列相液晶的光学取向。利用朗缪尔-布洛杰特沉积技术，在玻璃衬底上转移了对顺式异构体具有长寿命的偶氮苯分子的单分子膜。这种锚定产生了同向异性织构，并且这种锚定的强度随着单层数从1增加到7而增加。紫外光照射细胞，其光谱对应于反式构象中染料的吸收带，通过反式顺式光异构化过程和LCS对薄膜取向的调节，诱导LC分子强烈的重新排列。这种重定向主要发生在与激发的偏振面垂直的平面内。
We present optical alignment studies of pure nematic liquid crystals using photoisomerisable Langmuir-Blodgett (LB) alignment layer. Monolayers of azobenzene-containing molecules exhibiting long lifetime for cis isomer are transferred on glass substrates using the Langmuir-Blodgett deposition technique. The anchoring produces homeotropic texture and the strength of this anchoring is increasing with increasing number of monolayers from 1 to 7. The exposition of the cells with UV light the spectrum of which corresponds to the absorption band of the dye in the trans conformation induces strong realignment of the LC molecules via the trans-cis photoisomerization process and the regulation of the film orientation by LCs. Such reorientation occurs mainly in the plane perpendicular to the polarization plane of the excitation.