State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science, Fudan University, Shanghai 200433, P. R. China.
Mater Horiz. 2021 Jul 1;8(7):2079-2087. doi: 10.1039/d1mh00577d. Epub 2021 Jun 8.
In this paper, we report a facile strategy to combine magneto-responsive photonic crystal (MRPC) ink with 3D printing technology. The building blocks of MRPC are based on FeO magnetic nanoparticle clusters (MNCs) with uniform and tunable size. The MNC dispersion is able to change its photonic band gap from red to blue as the external magnetic field strength is increased. The magneto-responsive photonic crystal ink can be readily obtained by taking advantage of an ethylene glycol (EG)-in-oil emulsion with a reinforced silicone rubber prepolymer as the outer phase. Using the well-designed formula, the MNC dispersion can be well-preserved inside the emulsion droplets of the ink, maintaining its original contactless magnetic field response. As a proof of concept, custom quick response code and butterfly patterns were successfully printed and showed vivid and tunable color as a function of the external magnetic field strength with good repeatability.
在本文中，我们报告了一种将磁光导光子晶体（MRPC）墨水与 3D 打印技术相结合的简便策略。MRPC 的构建基块基于具有均匀和可调尺寸的 FeO 磁性纳米颗粒簇（MNC）。随着外加磁场强度的增加，MNC 分散体能够将其光子带隙从红色变为蓝色。通过利用具有增强型硅橡胶预聚物的乙二醇（EG）-油乳液，可以很容易地获得磁光导光子晶体墨水。利用精心设计的配方，可以将 MNC 分散体很好地保存在墨水的乳液液滴内，保持其原始的无接触磁场响应。作为概念验证，成功打印了定制的快速响应码和蝴蝶图案，并显示出作为外加磁场强度函数的生动且可调的颜色，具有良好的可重复性。
