Sunlight-driven smart windows with polymer/liquid crystal composites for autonomous control of optical properties
Sunlight-driven smart windows with polymer/liquid crystal composites for autonomous control of optical properties
复制标题
采用聚合物/液晶复合材料的阳光驱动智能窗，可自主控制光学特性
DOI：
10.1039/d2tc02754b
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发表时间：
2022
影响因子：
6.4
通讯作者：
Ikeda Tomiki
中科院分区：
文献类型：
--
作者：
Ube Toru;Imai Jumpei;Yoshida Marie;Fujisawa Toru;Hasebe Hiroshi;Takatsu Haruyoshi;Ikeda Tomiki
我们开发了由太阳光驱动的光学可切换智能窗，其使用含有偶氮苯衍生物的聚合物/液晶（LC）复合材料，该衍生物在太阳光下高效地进行反式-顺式异构化。复合材料在初始状态下表现出高的透明度，由于垂直排列的液晶，这是稳定的聚合物网络。光开关从透明态到光散射态的诱导等温暴露于阳光下，由于近晶A（SmA）的手性（N*）相变的LC，引发的反-顺式光异构化的偶氮苯。初始透明状态恢复在没有阳光的情况下，导致从N* 到SmA相变诱导的热顺反异构化的偶氮苯。这些仅利用阳光的自主智能窗户可以无处不在地安装，而无需额外的人工能源。
We developed optically switchable smart windows driven by sunlight with polymer/liquid crystal (LC) composites containing azobenzene derivatives, which undergo trans–cis isomerization with high efficiency under sunlight. The composites exhibited high transparency in the initial state owing to homeotropic alignment of LCs, which was stabilized by polymer networks. Optical switching from the tranparent state to a light-scattering state was induced isothermally upon exposure to sunlight due to smectic A (SmA) to chiral nematic (N*) phase transition of LCs, triggered by trans–cis photoisomerization of the azobenzenes. The initial transparent state was restored in the absence of sunlight, resulting from N* to SmA phase transition induced by thermal cis–trans back isomerization of the azobenzenes. These autonomic smart windows utilizing only sunlight can be ubiquitously installed without additional artificial sources of energy.