摘要
纤维素是丰富的可再生聚合物资源,通过强酸水解可得到结晶度较高的纤维素纳米晶(CNCs)。在合适的浓度下,CNCs悬浮液能够进行蒸发自组装,干燥后形成CNCs胆甾相液晶薄膜。CNCs手性液晶膜具有优异的圆偏振光性能,因此在光电子技术等领域十分重要。本文概述了CNCs的液晶性质和制备方法;着重探讨了CNCs手性液晶膜的结构色特性,以及通过物理和化学手段对CNCs膜的螺距进行调控的方法。同时,综述CNCs手性液晶膜的圆偏振光性能,对其圆偏振光反射性能和圆偏振荧光发射性能的研究进展和应用技术进行了总结和展望。CNCs手性液晶膜左旋和右旋圆偏振光性能的差异,使其在液晶显示器、光学防伪、传感器件等领域具有广阔的应用前景。此外,通过多种方法(添加荧光分子或金属等)制备的具有圆偏振荧光性能的CNCs膜材料,可作为检测激发态的手性探针,在一系列光学应用中具有潜在的应用价值和发展空间。
Cellulose is an abundant renewable polymer resource.Cellulose nanocrystals(CNCs)with high crystallinity can be obtained by hydrolysis with strong acid.After evaporation at a suitable concentration,the suspension of CNCs is dried and self-assembled to form cholesteric liquid crystal film of CNCs.CNCs chiral liquid crystal film exhibits excellent circularly polarized light properties,and is of grant importance in the field of optoelectronic technology.In this review,the liquid crystal behaviors and preparation methods of CNCs are summarized.The structural color properties as well as the pitch regulation of CNCs film by physical and chemical methods are emphatically discussed.At the same time,the circularly polarized light properties of CNCs chiral liquid crystal film are comprehensively introduced.The research progress and application technology of circularly polarized light reflectance properties and circularly polarized luminescence emission performance are summarized and prospected.The difference between the left-handed and right-handed circularly polarized light properties of CNCs chiral liquid crystal film makes it have broad application prospects in liquid crystal displays,optical anti-counterfeiting,sensor devices and other fields.In addition,CNCs film materials with circularly polarized luminescent performance that could be prepared by a variety of methods(such as adding luminescent molecules or metals)can be used as chiral probes to detect excited states,which has potential application values and development space in a series of optical applications.
作者
唐瑞琪
逯孟丽
段然
赵东宇
TANG Rui-qi;LU Meng-li;DUAN Ran;ZHAO Dong-yu(School of Chemistry,Beihang University,Beijing 100191,China)
出处
《液晶与显示》
CAS
CSCD
北大核心
2022年第10期1263-1277,共15页
Chinese Journal of Liquid Crystals and Displays
基金
科技部国家重点研发计划(No.2018YFB0703703)
国家自然科学基金(No.51973007,No.51673008)
北京市自然科学基金(No.2192030)。
关键词
纤维素纳米晶
结构色
螺距
圆偏振光
cellulose nanocrystals
structural color
pitch
circularly polarized light
