Stable amorphous blue phase of bent-core nematic liquid crystals doped with a chiral material
Stable amorphous blue phase of bent-core nematic liquid crystals doped with a chiral material
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DOI：
10.1039/c0jm00690d
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发表时间：
2010-01-01
影响因子：
--
通讯作者：
Jakli, Antal
中科院分区：
文献类型：
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作者：
Taushanoff, Stefanie;Van Le, Khoa;Jakli, Antal
我们报告了在掺杂高扭力手性材料的向列非手性弯核液晶中在相对较低和较宽（超过 20 摄氏度）的温度范围内诱导蓝相 III (BPIII)。随着手性掺杂比例的增加，节距减小，并且容易达到紫外波长，从而在正交偏光镜下获得完全暗的纹理。电光切换在几到几十毫秒的时间范围内实现。我们建议，为了稳定 BPIII，宽温度范围的近晶纳米团簇抑制双扭曲螺旋结构的长程有序，并且还抑制手性掺杂剂从混合物中可能分离。
We report an induction of the blue phase III (BPIII) at a relatively low and wide ( over 20 degrees C) temperature range in nematogenic achiral bent-core liquid crystals doped with a high twisting power chiral material. The pitch decreases with increasing chiral dopant ratio, and easily reaches the ultraviolet wavelength, so that completely dark texture is obtained under crossed polarizers. Electrooptical switching was achieved in a time range of a few to a few tens of milliseconds. We propose for the stabilization of BPIII that broad-temperature range smectic nano-clusters inhibit the long-range order of the double twisted helical structures, and also inhibit possible separation of chiral dopants from the mixture.