材料科学
超顺磁性
聚乙烯吡咯烷酮
纳米技术
磁铁矿
成核
化学工程
纳米团簇
晶体生长
纳米颗粒
粒径
胶体晶体
胶体
有机化学
结晶学
高分子化学
磁化
化学
量子力学
磁场
物理
工程类
冶金
作者
Yun Liu,Wei Luo,Qingsong Fan,Huiru Ma,Yadong Yin,Yi Long,Jianguo Guan
标识
DOI:10.1002/adfm.202303470
摘要
Abstract Achieving high stability and excellent optical performance in complex environments is crucial for practical applications of magnetically responsive photonic crystals (MRPCs). It, however, remains a great challenge. This study demonstrates a polyphenol‐mediated strategy for synthesizing size‐controllable superparamagnetic magnetite (Fe 3 O 4 ) 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 Fe 3 O 4 surfaces, the MRPCs can maintain nearly constant diffraction wavelength and high reflectance for up to 4 years. The strong coordination between TA and Fe 3+ inhibits crystal growth, ensuring the small primary crystal size and superparamagnetism of Fe 3 O 4 @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 Fe 3 O 4 @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.
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