祝贺李刚、罗巍和马会茹等撰写的研究论文“Lipophilic magnetic photonic nanochains for practical anti-counterfeiting”被Wiley旗下著名的材料TOP期刊Small (2021年期刊的影响因子IF：13.281) 接收（https://doi.org/10.1002/smll.202200662）！
由磁性胶体纳米簇作为组装基元的一维磁性光子晶体具有吸引人的磁取向、高折射率、灵活的图案可设计性和丰富的角度依赖性结构色，在防伪领域具有巨大的应用前景。但目前基于全固态磁性光子晶体的防伪标签耐环境性能和机械性能较差，而且制备工艺与现有的高通量丝网印刷技术不兼容，妨碍了它们的实际应用。为此，我们首次提出在二甲亚砜-水二元微观异相溶剂中，制备了高饱和度（半峰宽低于30nm）的亲脂性磁性光子纳米链（PNCs）。该PNCs可直接用做颜料分散在无溶剂的脂环族环氧树脂中配置成磁性光子晶体墨水，并通过磁场辅助的丝网印刷技术印刷得到防伪标签。得益于PNCs的磁各向异性以及与灵活多变的磁感线密切相关的空间分布和结构色，这种防伪标签具有独特的光变效果，易于肉眼识别，但难以模仿和复制，同时具有优异的耐环境性能和机械性能。这说明这种亲脂性光子纳米链有望在钱币和高档商品的防伪领域得到实际的应用；同时，我们在文中还阐明了亲脂性PNCs的聚合机理，并通过数值模拟对其进行了解释。本工作除了为构建有机-无机杂化纳米结构提供了一种有效的方法外，还为磁性PNCs在防伪等领域的实际应用提供了先进的结构颜料。
原文摘要如下：Magnetic photonic crystals (PCs) possess attractive magnetic orientation, flexible pattern designability and abundant angle-dependent colors, providing immense potential in anti-counterfeiting field. However, all-solid magnetic PCs-based labels generally suffer from incompatibility with screen printing techniques, and inferior environmental endurance and mechanical properties. Herein, by developing a selective concentration polymerization method under magnetic field (H) in microheterogeneous dimethyl sulfoxide-water binary solvents, we have fabricated individual tens-of-micrometer-length lipophilic magnetic photonic nanochains (PNCs) of full width at half maxima below 30 nm, which, after simply dispersed in solvent-free cycloaliphatic epoxy resin, can be formulated as photonic inks to print robust anti-counterfeiting labels through an H-assisted screen-printing technology. The as-printed labels possess vivid optically variable effects (OVEs) associated with the spatial distribution of H directionality, which are easy to identify by naked eyes but difficult to imitate and duplicate, while they show excellent environmental resistance and mechanical properties, promising the practical applications in banknotes and high-grade commodities. The polymerization mechanism of the lipophilic PNCs is elucidated, and the OVEs are deciphered in numerical simulation. Besides an efficient way to build organic-inorganic hybrid nanostructures, the work provides advanced structural color pigments to achieve the practical application of magnetic PCs in such as anti-counterfeiting field.
