通过二元和三元胶体的独特结晶实现微胶囊中的结构颜色混合,Advanced Materials

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通过二元和三元胶体的独特结晶实现微胶囊中的结构颜色混合
Advanced Materials ( IF 27.4 ) Pub Date : 2023-06-15 , DOI: 10.1002/adma.202302750
Sehee Yang ₁ , Young Geon Kim ₁ , Sanghyuk Park ₁ , Shin-Hyun Kim ₁

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胶体晶体被设计为适用于各种应用的光子微粒。然而，传统的微粒通常仅具有来自单个晶格常数的一个阻带，这限制了可用的颜色和光学代码的范围。在这里，创建的光子微胶囊包含两种或三种不同的晶粒，从而产生双阻带或三阻带，通过结构颜色混合提供更广泛的颜色。为了从二元或三元胶体混合物中产生不同的胶体微晶，使用双乳液液滴中的耗尽力来操纵颗粒间相互作用。最内层液滴中的二元或三元胶体混合物的水分散体在存在消耗剂和盐的情况下通过施加高渗条件被温和地浓缩。不同尺寸的颗粒结晶成各自的晶体，而不是形成随机的玻璃态合金，以最大限度地减少自由能。晶粒的平均尺寸可以通过渗透压来调节，不同晶粒的相对比例可以通过颗粒的混合比来控制。所得的具有小颗粒和高表面覆盖率的微胶囊几乎是光学各向同性的，并表现出高度饱和的混合结构颜色和多个反射峰。混合颜色和反射光谱可通过选择颗粒尺寸和混合比例来控制。

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Structural Color Mixing in Microcapsules through Exclusive Crystallization of Binary and Ternary Colloids

Colloidal crystals are designed as photonic microparticles for various applications. However, conventional microparticles generally have only one stopband from a single lattice constant, which restricts the range of colors and optical codes available. Here, photonic microcapsules are created that contain two or three distinct crystalline grains, resulting in dual or triple stopbands that offer a wider range of colors through structural color mixing. To produce distinct colloidal crystallites from binary or ternary colloidal mixtures, the interparticle interaction is manipulated using depletion forces in double-emulsion droplets. Aqueous dispersions of binary or ternary colloidal mixtures in the innermost droplet are gently concentrated in the presence of a depletant and salt by imposing hypertonic conditions. Different-sized particles crystallize into their own crystals rather than forming random glassy alloys to minimize free energy. The average size of the crystalline grains can be adjusted with osmotic pressure, and the relative ratio of distinct grains can be controlled with the mixing ratio of particles. The resulting microcapsules with small grains and high surface coverage are almost optically isotropic and exhibit highly-saturated mixed structural colors and multiple reflectance peaks. The mixed color and reflectance spectrum are controllable with the selection of particle sizes and mixing ratios.

更新日期：2023-06-15

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