Switchable mirrors of chiral liquid crystal gels
Switchable mirrors of chiral liquid crystal gels
复制标题
DOI：
10.1080/02678292.1999.11509448
复制
发表时间：
1999-11
期刊：
影响因子：
2.2
通讯作者：
R. Hikmet;H. Kemperman
中科院分区：
文献类型：
--
作者：
R. Hikmet;H. Kemperman
Chiral nematic liquid crystal compositions containing mono- and di-acrylates in mixtures with non-reactive liquid crystal molecules were produced. Defect-free planar macroscopic alignment of the molecules was induced between uniaxially rubbed substrates. Polymerization of the acrylate groups was initiated photochemically leading to the formation of a new class of chiral gels consisting of a lightly cross-linked network containing non-reactive molecules. In this way, the chiral pitch and, hence, the reflection colour became permanently fixed. Under the influence of an electric field the gels could be switched to the homeotropic state and reverted to the planar defect-free state upon removal of the electric field. Depending on the composition of the gel, either the position of the reflection band remained the same while its magnitude and/or width decreased, or its position shifted to smaller wavelengths with increasing electric field. Some of the gels showed sharp switching characteristics with a hysteresis...
