Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, China.
Phys Chem Chem Phys. 2010 Mar 20;12(11):2632-8. doi: 10.1039/b918884c. Epub 2010 Jan 27.
A chiral nematic liquid crystal (N*-LC)/chiral ionic liquid (CIL) composite with unique electro-optical characteristics was prepared and filled into a planar treated cell. When an electric field was applied to the cell, the anions and the cations of CIL moved towards the anode and the cathode of the power supply, respectively, thus forming a density gradient of the chiral groups, which resulted in wideband reflection. By adjusting the intensity of the electric field, the reflection bandwidth can be controlled accurately and reversibly. Moreover, the electric field-induced states can be memorized after the applied electric field is turned off. The reflective properties of the composite are investigated in the visible and near-infrared region, respectively. Additionally, the changes of the reflection bandwidths with the intensity and the applied time of the electric field were also investigated. From scanning electron microscopy (SEM) investigations, the mechanism of the electrically controllable reflection was demonstrated. Potential applications of the composite are related to reflective, color electronic paper (E-paper) and smart reflective windows for the solar light management.
一种具有独特电光特性的手性向列相液晶（N*-LC）/手性离子液体（CIL）复合材料被制备并填充到一个平面处理的单元中。当向该单元施加电场时，CIL 的阴离子和阳离子分别向电源的阳极和阴极移动，从而形成手性基团的密度梯度，导致宽带反射。通过调节电场的强度，可以精确且可逆地控制反射带宽。此外，在施加的电场关闭后，可以记住电场诱导的状态。在可见和近红外区域分别研究了该复合材料的反射特性。此外，还研究了反射带宽随电场强度和施加时间的变化。通过扫描电子显微镜（SEM）研究，证明了电可控反射的机制。该复合材料的潜在应用涉及反射式、彩色电子纸（E-paper）和用于太阳能管理的智能反射窗。
