热烈祝贺我团队刘云、罗巍、马会茹等与美国加州大学河滨分校殷亚东教授团队以及香港中文大学龙祎教授合作撰写的研究论文“Polyphenol-Mediated Synthesis of Superparamagnetic Magnetite Nanoclusters for Highly Stable Magnetically Responsive Photonic Crystals”被材料学科著名学术期刊Advanced Functional Materials（2022年IF:19.924，中科院1区Top期刊）接收！

    提升磁响应性光子晶体（MRPCs）在复杂介质环境中的光学性能和稳定性对其实际应用至关重要，但目前依然是一个重大挑战。本文发展了一种多酚辅助溶剂热策略制备了尺寸可控的超顺磁四氧化三铁（Fe₃O₄）胶体纳米晶簇。该胶体纳米晶簇在多种极性溶剂中具有良好的分散性及稳定性，在外磁场作用下，显现靓丽的结构色。得益于单宁酸（TA）的桥连作用，聚乙烯吡咯烷酮（PVP）聚合物链可牢固地连接在Fe₃O₄纳米晶表面，避免其在存储过程中的脱落，在长达四年的存储时间里，所得的MRPCs保持几乎恒定的衍射波长及高反射率。TA与Fe³⁺之间强的络合作用，能够抑制Fe₃O₄初级纳米晶的生长，使初级纳米晶尺寸仅有几纳米，保证了所得Fe₃O₄@TA-PVP胶体纳米晶簇的超顺磁性。TA的部分氧化可减弱其与Fe³⁺之间的络合作用，促进Fe₃O₄纳米晶的成核与生长，快的成核速率使最终产物尺寸减小。控制TA氧化程度或用量，可有效调节Fe₃O₄@TA-PVP胶体纳米晶簇的尺寸。同时，提升反应物溶解的均一性，有利于得到单分散胶体纳米晶簇。以具有高稳定性及单分散性的胶体纳米晶簇为组装基元，所制备的磁响应性光子晶体稳定性高、颜色亮丽，在显示、传感、防伪、伪装等领域的实际应用具有重要价值。此外，所得Fe₃O₄@TA-PVP胶体纳米晶簇的高稳定性及易于功能化的表面，使其在磁共振成像、靶向载药、可回收催化剂、磁性纳米马达等领域具有重要潜在应用。

    原文摘要如下：High stability of magnetically responsive photonic crystals (MRPCs) with superior optical properties in complex environments is important for practical applications but still remains a challenge. This work demonstrates a polyphenol-mediated strategy for synthesizing size-controllable superparamagnetic magnetite (Fe₃O₄) colloid nanocrystal clusters (CNCs) that can be stably dispersed in various polar solvents to form MRPCs with brilliant structural colors for a long term. As tannic acid (TA) functions as a linker to robustly bind polyvinylpyrrolidone (PVP) chains to Fe₃O₄ surfaces, the MRPCs could maintain nearly constant diffraction wavelength and high reflectance for up to four years. The strong coordination between TA and Fe³⁺ inhibits crystal growth, ensuring the small primary crystal size and superparamagnetism of Fe₃O₄@TA-PVP CNCs. Partial oxidation of TA accelerates the crystal nucleation and growth, reducing the overall CNC particle size, which can be utilized for controlling the particle size. Additionally, enhancing the dissolution of PVP before the solvothermal reaction improves the size monodispersity of the products, making the as-constructed MRPCs ideal for practical applications in color display, sensors, anti-counterfeiting, and camouflage. The Fe₃O₄@TA-PVP CNCs with high stability and versatility for surface-functionalization are also promising for magnetic resonance imaging, targeting drug delivery, recyclable catalysis, and magnetic nanomotors.