Abstract

Structural colors generated by colloidal crystals offer a promising method to create large-scale nanostructures due to their stability in comparison with dyes and pigments. However, the low durability and the low efficiency of colloidal crystals limit their practical applications. In this work, a rapid coating technology was applied in fabricating colloidal crystals on paper substrates with silicon dioxide microspheres in order to develop a fast and efficient method to produce structural colors. It was confirmed that the silicon dioxide colloidal microspheres could form a uniform photonic crystal film on papers in the end of the assembly process, and the formation mechanism of photonic crystal on papers were proposed. The optical properties of structural colors on papers were investigated and the position of photonic band gap was characterized. The results showed that the varied structural colors across the visible region confirmed by reflectance spectra could be adjusted by controlling the sizes of the microspheres and viewing angles, and this was consistent with the law of the Bragg diffraction. The CIE1976L*a*b* values of the structural colors were in agreement with their reflectance spectra. The rapid coating technology producing colloidal crystals is efficient with low cost and high adhesion, which can be used in the design and application of green printing and packaging industries.

摘要

与染料和颜料相比，由胶体晶体产生的结构颜色提供了一种有前途的方法来创建大规模纳米结构，因为它们具有稳定性。然而，胶体晶体的低耐久性和低效率限制了它们的实际应用。在这项工作中，应用快速涂层技术在具有二氧化硅微球的纸基材上制造胶体晶体，以开发一种快速有效的方法来产生结构色。证实了二氧化硅胶体微球在组装过程结束时可以在纸上形成均匀的光子晶体薄膜，并提出了光子晶体在纸上的形成机制。研究了纸上结构色的光学性质并表征了光子带隙的位置。结果表明，可以通过控制微球的大小和视角来调整反射光谱确定的可见光区结构颜色的变化，这与布拉格衍射定律是一致的。结构色的 CIE1976L*a*b* 值与其反射光谱一致。生产胶体晶体的快速涂布技术效率高、成本低、附着力高，可用于绿色印刷包装行业的设计和应用。结构色的 CIE1976L*a*b* 值与其反射光谱一致。生产胶体晶体的快速涂布技术效率高、成本低、附着力高，可用于绿色印刷包装行业的设计和应用。结构色的 CIE1976L*a*b* 值与其反射光谱一致。生产胶体晶体的快速涂布技术效率高、成本低、附着力高，可用于绿色印刷包装行业的设计和应用。