Wang Junwei, Liu Yang, Bleyer Gudrun, Goerlitzer Eric S A, Englisch Silvan, Przybilla Thomas, Mbah Chrameh Fru, Engel Michael, Spiecker Erdmann, Imaz Inhar, Maspoch Daniel, Vogel Nicolas
Institute of Particle Technology, Friedrich-Alexander Universität Erlangen-Nürnberg, 91058, Erlangen, Germany.
Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC & The Barcelona Institute of Science and Technology, Bellaterra, 08193, Barcelona, Spain.
Angew Chem Int Ed Engl. 2022 Apr 11;61(16):e202117455. doi: 10.1002/anie.202117455. Epub 2022 Feb 23.
Supraparticles are spherical colloidal crystals prepared by confined self-assembly processes. A particularly appealing property of these microscale structures is the structural color arising from interference of light with their building blocks. Here, we assemble supraparticles with high structural order that exhibit coloration from uniform, polyhedral metal-organic framework (MOF) particles. We analyse the structural coloration as a function of the size of these anisotropic building blocks and their internal structure. We attribute the angle-dependent coloration of the MOF supraparticles to the presence of ordered, onion-like layers at the outermost regions. Surprisingly, even though different shapes of the MOF particles have different propensities to form these onion layers, all supraparticle dispersions show well-visible macroscopic coloration, indicating that local ordering is sufficient to generate interference effects.
超粒子是通过受限自组装过程制备的球形胶体晶体。这些微观结构的一个特别吸引人的特性是由光与其构建块的干涉产生的结构色。在这里，我们组装了具有高结构有序性的超粒子，这些超粒子由均匀的多面体金属有机框架（MOF）颗粒呈现出颜色。我们分析了结构色作为这些各向异性构建块的尺寸及其内部结构的函数。我们将MOF超粒子的角度依赖性颜色归因于最外层区域存在有序的洋葱状层。令人惊讶的是，尽管MOF颗粒的不同形状形成这些洋葱层的倾向不同，但所有超粒子分散体都显示出清晰可见的宏观颜色，这表明局部有序性足以产生干涉效应。
