Laser-induced concentric colour domains in a cholesteric liquid crystal mixture containing a nematic azobenzene dopant
Laser-induced concentric colour domains in a cholesteric liquid crystal mixture containing a nematic azobenzene dopant
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含有向列偶氮苯掺杂剂的胆甾型液晶混合物中激光诱导的同心色域
DOI：
10.1080/02678290110093778
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发表时间：
2002
期刊：
影响因子：
2.2
通讯作者：
N. Usova
中科院分区：
文献类型：
--
作者：
S. Serak;E. O. Arikainen;H. Gleeson;V. Grozhik;J. Guillou;N. Usova
在掺杂有10wt%的光致变色材料的光致变色混合物中已经观察到同心色域的等温形成。主体光致变色剂混合物包括Merck材料BL 131 a和BL 130，而光致变色掺杂剂是4-正丁基-4 ′-正烷氧基偶氮苯（BAAB）的混合物。如所预期的，在用纯反式构型的分子照射之前添加光致变色光致变色材料时，主体光致变色材料混合物的螺距增加。在低功率（0.6 mW）氩离子激光照射下，相互作用区域内形成顺式异构体，并出现同心色域。在400-560 nm的光谱范围内发生了来自颜色域的选择性反射。着色域持续照射后的时间段内，并扩展超出相互作用区域，因为扩散的顺式异构体。使用的扩散方程，已获得的表达式的平均浓度的顺式异构体中的每个有色域和反射波长的依赖关系后的浓度的顺式异构体已被确定。
The isothermal formation of concentric colour domains has been observed in a cholesteric mixture doped with 10 wt % of a photochromic nematic material. The host cholesteric mixture included the Merck materials BL131a and BL130, while the photochromic dopant was a mixture of 4-n-butyl-4′-n-alkoxyazobenzenes (BAAB). The helical pitch of the host cholesteric mixture was increased, as expected, on addition of the photochromic nematic material prior to irradiation with the molecules in the purely trans-configuration. On irradiation with low power (0.6 mW) argon ion laser light, cis-isomers formed within the interaction region and concentric colour domains appeared. Selective reflection from the colour domains occurred in the 400–560 nm spectral range. The coloured domains persisted in the time period following irradiation and extended beyond the interaction region because of diffusion of the cis-isomers. Using the diffusion equation, an expression has been obtained for the average concentration of cis-isomers in each of the coloured domains and the dependence of the reflection wavelength upon the concentration of cis-isomers has been determined.