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Light- and Humidity-Responsive Chiral Nematic Photonic Crystal Films Based on Cellulose Nanocrystals.
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-05-04 , DOI: 10.1021/acsami.0c05139
Huanghuang Chen 1 , Aiqin Hou 1, 2 , Changwu Zheng 1 , Jing Tang 2 , Kongliang Xie 2 , Aiqin Gao 1, 2
Affiliation  

Light- and humidity-responsive chiral nematic photonic crystal (PC) films containing cellulose nanocrystals (CNCs) were fabricated. A photoactive polymer with hydrophilic groups, poly-(3,3'-benzophenone-4,4'-dicarboxylic acid dicarboxylate polyethylene glycol) ester, was coassembled with CNCs to form flexible iridescent films with a tunable chiral nematic order. In the coassembly process, the intermolecular hydrogen bonds of CNCs were weakened, which facilitated the fine regulation of the chiral PC nanostructure. The PC films displayed sensitive responses to both light and humidity. With increasing humidity from 30 to 100%, the chiral nematic helix pitch increased from 328 to 422 nm. The color of the PC films changed from blue to green, yellow, orange, and dark red with increasing relative humidity. Over 15 min of light irradiation, the absorption intensity of the films increased gradually. The light and humidity responses of the films were reversible. The films maintained their variable cholesteric liquid crystal texture and helical lamellar structure after light irradiation at different humidities. These PC films are expected to be useful in intelligent coatings and 3D printing.

中文翻译:

基于纤维素纳米晶体的光和湿响应手性向列型光子晶体薄膜。

制作了包含纤维素纳米晶体(CNC)的光响应和湿度响应的手性向列型光子晶体(PC)膜。具有亲水性基团的光敏聚合物,聚-(3,3'-二苯甲酮-4,4'-二羧酸二羧酸酯聚乙二醇)酯,与CNCs共组装,形成具有可调手性向列序的柔性虹彩膜。在共组装过程中,CNCs的分子间氢键被削弱,这有利于手性PC纳米结构的精细调节。PC膜对光和湿度都显示出敏感的响应。随着湿度从30%增加到100%,手性向列螺旋螺距从328 nm增加到422 nm。随着相对湿度的增加,PC膜的颜色从蓝色变为绿色,黄色,橙色和深红色。在15分钟的光照射下,薄膜的吸收强度逐渐增加。薄膜的光和湿响应是可逆的。薄膜在不同湿度下照射后仍保持其可变的胆甾型液晶质地和螺旋层状结构。这些PC膜有望用于智能涂料和3D打印。
更新日期:2020-05-04
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