具有双重光学特征的SiO2/CNC复合薄膜的制备与表征  

Fabrication and Characterization of SiO2/CNC Composite Film with Dual Optical Properties

作　　者：迟聪聪 线佳荣 屈盼盼 许馨 张丹洁 白飞飞 任蒋雪 周雨楠 徐星根 CHI Congcong;XIAN Jiarong;QU Panpan;XU Xin;ZHANG Danjie;BAI Feifei;REN Jiangxue;ZHOU Yunan;XU Xinggen(College of Bioresources Chemical and Materials Engineering,Shaanxi University of Science&Technology,Xi'an 710021,China;Wuhan China Star Optoelectronics Technology Co.Ltd,Wuhan 330006,China)

机构地区：[1]陕西科技大学轻工科学与工程学院,西安710021 [2]武汉华星光电半导体显示技术有限公司,武汉330006

出　　处：《光子学报》2023年第9期273-282,共10页Acta Photonica Sinica

基　　金：制浆造纸科学与技术教育部重点实验室开放基金(No.KF202108);省级大学生创新训练计划项目(No.S202210708112);陕西科技大学国际化教育教学改革研究项目(No.GJ22ZD01);国家自然科学基金(No.31600476)。

摘　　要：共混纤维素纳米晶和粒径呈多分散分布的二氧化硅,采用浇注自组装法制备复合薄膜,探究了分散剂聚乙烯吡咯烷酮和成膜剂聚乙烯醇对复合薄膜结构色的影响。研究发现,聚乙烯吡咯烷酮和聚乙烯醇均使纤维素纳米晶结构色红移,使二氧化硅虹彩色更加绚丽,且聚乙烯醇用量的增加有助于改进成膜性,但薄膜柔韧性随聚乙烯吡咯烷酮用量的增加而变差。当0.3%(w/w)二氧化硅分散液与2%(w/w)纤维素纳米晶分散液二者质量比为1∶4,聚乙烯吡咯烷酮用量为1.2%,聚乙烯醇用量为20%时,薄膜成膜性能较好且呈现双重光学特性。本文制备的薄膜同时具备纤维素纳米晶手性向列相结构和二氧化硅光子晶体结构,实现结构色相互叠加,拓宽了其在光学防伪、光学加密等领域的应用。Structural color can be created when the ordered microstructure of an object interacts with incident light.Compared to the traditional pigment colors,it is bright,long-lasting,and environmentally friendly.As a result,it is of great significance for further research and development.Cellulose Nanocrystals(CNC)and silica are representatives of organic and inorganic particles that can be self-assembled to form structural color.Cellulose nanocrystals,originating from natural cellulose through sulfuric acid hydrolysis,can be stabilized in water through electrostatic repulsion owing to the sulfonic ester groups on their surface.At certain concentrations,colloidal solutions of these particles will self-assemble into cholesteric structures and retain them in dry films,resulting in structural colors caused by their optical activity.The periodic photonic crystal formed by the self-assembly of silica produces iridescent color attributed to the shielding effect of photonic band gap under incident light.At present,cellulose nanocrystals and silica are mainly combined with other materials respectively to form composites,but there are some shortages,such as the high cost of techniques or the complex appearance of optical properties.In order to solve the above problems,here we propose to fabricate the composite film with dual optical properties by self-assembly of the suspension of cellulose nanocrystals and polydisperse silica.Different optical performance was exhibited under natural light or point light source.In this study,the seed solution method of adding silica source step by step to control the hydrolysis-condensation rate of silica microspheres was used,resulting in the formation of polydisperse silica.The silica diameter ranges from 450 nm to 650 nm,which is distributed symmetrically around the mean diameter of 600 nm.Under a point light source,the photonic crystals formed by vertical self-assembly display iridescent color.Furthermore,the water dispersion of silica was blended with commercial nanocellulose solution,then

关 键 词：二氧化硅 纳米纤维素 自组装 光子晶体 结构色 双重光学特征 

分 类 号：TB332[一般工业技术—材料科学与工程]