论文标题
基于纳米颗粒的二进制混合物中的结构颜色机理
Mechanism of Structural Colors in Binary Mixtures of Nanoparticle-based Supraballs
论文作者
论文摘要
受鸟类物种的结构颜色的启发，已经开发出了各种合成策略，以使用纳米颗粒组件产生非冰箱，饱和的颜色。粒子化学（或复杂折射率）和粒径变化的纳米颗粒的混合物具有影响产生颜色的其他新兴特性。对于如此复杂的多组分系统，对组装结构以及强大的光学建模工具的理解可以使科学家能够进行密集的结构颜色关系研究，并用量身定制的颜色制造设计师材料。在这里，我们演示了如何使用计算反向工程分析来从小角度散射测量中重建组装结构，以进行散射实验（Crease）方法，然后在有限差异时（FDTD）计算中使用重建的结构来预测颜色。我们成功地，定量预测了含有强烈吸收黑色素纳米颗粒的混合物中的实验观察到的颜色，并证明了单层分离的纳米颗粒对产生的颜色的影响。这项工作中介绍的多功能计算方法对于具有所需颜色的工程合成材料很有用，而无需费力的试验和错误实验。
Inspired by structural colors in avian species, various synthetic strategies have been developed to produce non-iridescent, saturated colors using nanoparticle assemblies. Mixtures of nanoparticles varying in particle chemistry (or complex refractive indices) and particle size have additional emergent properties that impact the color produced. For such complex multi-component systems, an understanding of assembled structure along with a robust optical modeling tool can empower scientists to perform intensive structure-color relationship studies and fabricate designer materials with tailored color. Here, we demonstrate how we can reconstruct the assembled structure from small-angle scattering measurements using the computational reverse-engineering analysis for scattering experiments (CREASE) method and then use the reconstructed structure in finite-difference time-domain (FDTD) calculations to predict color. We successfully, quantitatively predict experimentally observed color in mixtures containing strongly absorbing melanin nanoparticles and demonstrate the influence of a single layer of segregated nanoparticles on color produced. The versatile computational approach presented in this work is useful for engineering synthetic materials with desired colors without laborious trial and error experiments.
