Kanai Toshimitsu, Nakagawa Sato, Takeshima Hikaru, Hirano Yuna
Yokohama National University, 79-5, Tokiwadai, Hodogaya, Yokohama, Kanagawa 240-8501, Japan.
Yokohama National University, 79-5, Tokiwadai, Hodogaya, Yokohama, Kanagawa 240-8501, Japan.
J Colloid Interface Sci. 2023 Jan;629(Pt A):225-232. doi: 10.1016/j.jcis.2022.08.162. Epub 2022 Aug 28.
Structural colors derived from the scattering or reflection of light by submicron-sized ordered structures are interesting due to their non-fading and tunable colors. Herein we show a colored angle-independent amorphous phase of monodisperse colloids between the crystalline and random phases in a charged colloidal system. The amorphous photonic structures with low packing density display uniform color over large areas; this is easily altered by adjusting the particle volume fraction. The transmission spectra of amorphous phases display an intersection point at the Bragg wavelength, allowing design of the transmission color. We demonstrate that the aqueous suspended colloidal amorphous structures can be immobilized in hydrogel films, while preserving their spectral properties. The sensitivity of the gel to ethanol allows the color to be tuned by changing the ethanol concentration. This angle-independent uniform color with easy tunability has great potential for application in advanced color materials and sensors.
由亚微米级有序结构对光的散射或反射产生的结构色，因其不褪色和颜色可调而备受关注。在此，我们展示了一种在带电胶体系统中，介于晶体相和无序相之间的单分散胶体的与角度无关的彩色非晶相。具有低堆积密度的非晶光子结构在大面积上显示出均匀的颜色；通过调节颗粒体积分数可以很容易地改变这种颜色。非晶相的透射光谱在布拉格波长处显示出一个交点，从而可以设计透射颜色。我们证明，水性悬浮的胶体非晶结构可以固定在水凝胶薄膜中，同时保留其光谱特性。凝胶对乙醇的敏感性使得可以通过改变乙醇浓度来调节颜色。这种与角度无关的均匀颜色且易于调节，在先进的颜色材料和传感器应用中具有巨大潜力。
