热烈祝贺我组刘云博士生、马会茹老师与University of California Riverside的 Prof. Yadong Yin等合作撰写的研究论文 “Dual Responsive Photonic Liquid for Independent Modulation of Color Brightness and Hue”被英国皇家化会（RSC）旗下的顶尖材料学期刊Materials Horizons (IF: 12.319) 接收并在线发表（https://doi.org/10.1039/D1MH00556A）！

响应性变色材料在显示、防伪、伪装等领域有广泛需求和重要应用，但它们现有很难精细、独立调控其颜色的三要素，从而严重妨碍其应用范围。本文在双响应Fe₃O₄@ PVP@ PNIPAM 柔性磁性光子晶体纳米链的水分散液中实现了结构色亮度及色度的独立、连续、可逆调控。通过实验观察及理论模拟分析了柔性光子晶体纳米链的形态对随外界磁场刺激的响应行为，阐明了颜色亮度调控机制。当施加的外加磁场逐渐增强时，由于光子晶体纳米链的磁偶极相互作用逐渐克服其热运动，蠕虫状的柔性链沿磁场方向取向的链段长度逐渐增长直至整条链沿磁场方向完全伸展，宏观上表现为仅有亮度（衍射强度）逐渐增加。另外，由于PNIPAM具有温度响应的体积相变行为，分散液的色度（衍射频率）可以通过调节环境温度进行调控，从而可实现颜色亮度和色度的独立调控。本文结果可望引领新一代响应性变色材料的研制，加深颜色调控机理的理解。得到的响应性变色液体由于颜色调控灵活、简单并且易于成型，在全色显示及自适应伪装等领域具有重要潜在应用。

    原文摘要如下：Responsive chromic materials are highly desirable in the fields of displays, anti-counterfeitings, and camouflages but their advanced applications usually limit by the unrealized delicate and independent tunability in the three intrinsic attributes of color. This work achieves the separate, continuous, and reversible modulation of structural color brightness and hue by an aqueous suspension of dual-responsive Fe₃O₄@polyvinylpyrrolidone (PVP)@poly(N-isopropyl acrylamide) (PNIPAM) flexible photonic nanochains. The underlying modulation mechanism of color brightness has been experimentally and numerically deciphered by analyzing their morphological responses to stimuli. When an increasing magnetic field is applied, the random worm-like flexible photonic nanochains gradually orientate along the field direction due to the dominant magnetic dipole interaction over the thermal motion, lengthening the orientation segment length up to the whole nanochains. Consequently, the suspension displays increased color brightness (characterized by diffraction intensity). Meanwhile, its color hue (characterized by diffraction frequency) can be controlled by temperature due to the volume changes of the interparticle PNIPAM. The achieved diverse color modulation steps forward to the next-generation responsive chromic materials and enriches the basic understanding of color tuning mechanisms. With versatile and facile color tunability and shape patterning, the developed responsive chromic liquid promises attractive potentials in full-color displays and adaptive camouflages.