Dicholesteryl icosanedioate as a glass-forming cholesteric liquid crystal: properties, additive effects and application in color recording
Dicholesteryl icosanedioate as a glass-forming cholesteric liquid crystal: properties, additive effects and application in color recording
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DOI：
10.1039/c3tc32179g
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发表时间：
2014-01-01
影响因子：
6.4
通讯作者：
Tamaoki, Nobuyuki
中科院分区：
文献类型：
--
作者：
Kim, Yuna;Wada, Momoyo;Tamaoki, Nobuyuki
一种胆甾酯二聚体-二胆甾酯二十烷二酸酯-进行了彩色成像检查。介绍了胆固醇作为降低相变温度的重要掺杂剂之一。4,4′-二氧二偶氮苯和4,4′-二氧二联苯促进胆甾相的近晶结构域的形成，导致整个可见光区域的反射带位移扩大。特别是，光响应掺杂剂4,4′-二氧偶氮苯使我们能够通过光子和热模式实现胆甾膜的可逆RGB颜色调谐。反式光异构化导致胆甾酯节距变化，导致反射颜色变化，并记录光学图像在玻璃固体膜状态下稳定了8个月以上。
A cholesteric ester dimer - dicholesteryl icosanedioate - was examined for color imaging. Cholesterol was introduced as one of the dopants which performed an important role reducing phase transition temperatures. The other dopants, 4,4'-dialkoxyazobenzene and 4,4'-dialkoxybiphenyl promoted formation of smectic domains in cholesteric phases which resulted in the expansion of the reflective band shift over the whole visible region. In particular, the photo-responsive dopant 4,4'-dialkoxyazobenzene allowed us to realize reversible RGB color tuning of the cholesteric film by both photon and thermal modes. The trans-cis photoisomerization led to a cholesteric pitch change which resulted in reflective color change, and recorded optical images that have been stable for more than 8 months in a glassy solid film state.