Controlled Stratification and Assembly of Cellulose Nanocrystals in Polymeric Films Toward Optically Active Coatings

IF 4.3 3区 材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY
Farid Khelifa, Heike M. A. Ehmann, Abderrahman Lamaoui, Mathieu Surin, Jenifer Rubio-Magnieto, Philippe Dubois, Youssef Habibi
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Abstract

Nature's most brilliant hues arise from the interaction of light with multilayered- structures of aligned building blocks. Mimicking this hierarchical organization in highly-ordered thin films of liquid crystalline species has attracted increasing attention for potential applications in sensors and optical switching displays. Due to its intriguing ability to organize into optically active materials, cellulose nanocrystals (CNCs) are attracting a strong interest in the scientific community. This study demonstrates that the shear-driven convective assembly technique can be used to stratify in a controlled fashion highly ordered multilayers of rod-like CNC embedded in a protective hydrophobic polymer matrix leading to optically active thin films. The films remain fully transparent even after stratifying 50 layers. Atomic force microscopy analysis reveals that over 87% of the CNCs in the upper layer aligned within ±20° of the withdrawal direction. Notably, the stratification does not disrupt the organization of the underlying layers. The films exhibit strong selective reflections with uniform and intense colors, dependent on the number of stratified layers. This scalable appraoch enables precise control over the optical characteristics of CNC-polymer composite films, presenting opportunities for environmentally friendly applications in pigment-free coatings, security papers, and optical devices.

Abstract Image

纤维素纳米晶体在聚合物膜中的可控分层和组装,用于光学活性涂层
自然界最绚丽的色调源于光与由排列整齐的构件组成的多层结构的相互作用。在高度有序的液晶薄膜中模仿这种分层组织,在传感器和光学开关显示器中的潜在应用引起了越来越多的关注。由于纤维素纳米晶体(CNC)具有组织成光学活性材料的能力,因此引起了科学界的浓厚兴趣。这项研究表明,剪切力驱动的对流组装技术可用于以受控方式将嵌入疏水性聚合物保护基质中的棒状 CNC 高度有序多层分层,从而形成具有光学活性的薄膜。即使在分层 50 层后,薄膜仍能保持完全透明。原子力显微镜分析表明,上层中超过 87% 的 CNC 在抽取方向 ±20° 范围内排列。值得注意的是,分层并没有破坏下层的组织结构。薄膜表现出强烈的选择性反射,颜色均匀而强烈,这取决于分层的层数。这种可扩展的鉴定方法能够精确控制 CNC 聚合物复合薄膜的光学特性,为无颜料涂料、防伪纸张和光学设备中的环保应用提供了机会。
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来源期刊
Advanced Materials Interfaces
Advanced Materials Interfaces CHEMISTRY, MULTIDISCIPLINARY-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
8.40
自引率
5.60%
发文量
1174
审稿时长
1.3 months
期刊介绍: Advanced Materials Interfaces publishes top-level research on interface technologies and effects. Considering any interface formed between solids, liquids, and gases, the journal ensures an interdisciplinary blend of physics, chemistry, materials science, and life sciences. Advanced Materials Interfaces was launched in 2014 and received an Impact Factor of 4.834 in 2018. The scope of Advanced Materials Interfaces is dedicated to interfaces and surfaces that play an essential role in virtually all materials and devices. Physics, chemistry, materials science and life sciences blend to encourage new, cross-pollinating ideas, which will drive forward our understanding of the processes at the interface. Advanced Materials Interfaces covers all topics in interface-related research: Oil / water separation, Applications of nanostructured materials, 2D materials and heterostructures, Surfaces and interfaces in organic electronic devices, Catalysis and membranes, Self-assembly and nanopatterned surfaces, Composite and coating materials, Biointerfaces for technical and medical applications. Advanced Materials Interfaces provides a forum for topics on surface and interface science with a wide choice of formats: Reviews, Full Papers, and Communications, as well as Progress Reports and Research News.
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