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| Preparation and Properties of Iridescent Films with Cellulose Nanocrystals and Deep Eutectic Solvents |
| Received:July 16, 2025 Revised:July 30, 2025 |
| DOI：10.11980/j.issn.0254-508X.2025.10.014 |
| Key Words:cellulose nanocrystals structure color deep eutectic solvents iridescent films |
| Fund Project:中国博士后科学基金资助项目（2024M760380）；2024年度浙江省博士后科研项目（ZJ2024113）；2023年度浙江省教育厅一般科研项目（Y202351793）；浙江科技学院青年科学基金项目（2023QN052）；浙江科技大学环境与资源学院青年教师创新研究项目（HZQY202408）。 |
| Author Name | Affiliation | Postcode | | MENG Yahui* | College of Materials Science and Engineering, Northeast Forestry University, Harbin, Heilongjiang Province,150006
School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023
Zhejiang Jingxing Paper Industry Co., Ltd., Jiaxing, Zhejiang Province, 314214 | 314214 | | XU Qingliang | Zhejiang Jingxing Paper Industry Co., Ltd., Jiaxing, Zhejiang Province, 314214 | 314214 | | ZHAO Huifang | School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023 | 310023 | | SHA Lizheng | School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023 | 310023 | | HE Zhiyang | School of Environmental and Nature Resources, Zhejiang University of Science and Technology, Hangzhou, Zhejiang Province, 310023 | 310023 |
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| Abstract:This study successfully fabricated flexible cellulose nanocrystal (CNC) structurally colored films by integrating a deep eutectic solvent (DES) into the CNC system through evaporation-induced self-assembly method and vacuum-assisted self-assembly method. The interaction mechanism between DES and CNC， along with the effects of both assembly techniques on the film’s microstructure， structural color， mechanical properties， and humidity-responsive behavior， were systematically investigated. The results showed that both methods enhanced the flexibility of CNC films. The vacuum-assisted assembly approach endowed the CNC-V and CNC/DES-V films with uniform structural colors (pearl-blue and cyan-blue)， smaller polydomain structures and pitches (132 and 160 nm)， higher tensile strengths ((58.4±2.1) MPa and (27.9±1.7） MPa)， and a narrower humidity-responsive color range (from blue to light yellow). In contrast， the evaporation-induced self-assembly method provided the CNC-E and CNC/DES-E films with brighter structural colors (blue and cyan)， larger pitches (136 and 175 nm)， and a broader humidity-induced color-shifting range (from cyan to orange). |
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