Song Dong-Po, Zhao Tianheng H, Guidetti Giulia, Vignolini Silvia, Parker Richard M
Tianjin Key Laboratory of Composite and Functional Materials, School of Materials Science and Engineering , Tianjin University , Tianjin 300350 , People's Republic of China.
Department of Chemistry , University of Cambridge , Lensfield Road , Cambridge CB2 1EW , U.K.
ACS Nano. 2019 Feb 26;13(2):1764-1771. doi: 10.1021/acsnano.8b07845. Epub 2019 Jan 28.
Hierarchical, structurally colored materials offer a wide variety of visual effects that cannot be achieved with standard pigments or dyes. However, their fabrication requires simultaneous control over multiple length-scales. Here we introduce a robust strategy for the fabrication of hierarchical photonic pigments via the confined self-assembly of bottlebrush block copolymers within emulsified microdroplets. The bottlebrush block copolymer self-assembles into highly ordered concentric lamellae, giving rise to a near perfect photonic multilayer in the solid state, with reflectivity up to 100%. The reflected color can be readily tuned across the whole visible spectrum by either altering the molecular weight or by blending the bottlebrush block copolymers. Furthermore, the developed photonic pigments are responsive, with a selective and reversible color change observed upon swelling in different solvents. Our system is particularly suited for the scalable production of photonic pigments, arising from their rapid self-assembly mechanism and size-independent color.
具有层次结构的结构色材料提供了多种用标准颜料或染料无法实现的视觉效果。然而，它们的制造需要同时控制多个长度尺度。在这里，我们介绍一种通过在乳化微滴中瓶刷状嵌段共聚物的受限自组装来制造分层光子颜料的稳健策略。瓶刷状嵌段共聚物自组装成高度有序的同心层状结构，在固态下形成近乎完美的光子多层结构，反射率高达100%。通过改变分子量或混合瓶刷状嵌段共聚物，可以很容易地在整个可见光谱范围内调节反射颜色。此外，所开发的光子颜料具有响应性，在不同溶剂中溶胀时会观察到选择性和可逆的颜色变化。我们的系统特别适合于光子颜料的可扩展生产，这源于它们快速的自组装机制和与尺寸无关的颜色。
