Simple Preparation and Optical Properties of Colloidal Amorphous Array

具有抗褪色性能的有色颜料在工业上有许多应用。开发一种低成本、大批量生产的抗褪色颜料的方法，具有低毒性和最小的环境影响，可以支持其广泛使用。为了实现这一目标，我们需要使用丰富且环保的化合物来制备颜料。我们证明了细小的、亚微米级的二氧化硅球形颗粒聚集在一起会产生各种颜色。由于这种聚集体的微观结构是各向同性的，并且在与光学波长相当的长度尺度上具有短程有序，因此表现出由波长特异性构造反射引起的不依赖于角度的结构色。通过加入少量传统的黑色颗粒，可以增加这种聚合体的颜色饱和度。将不同尺寸的细亚微米二氧化硅球形颗粒与黑色颗粒结合，可以制备出彩色的绿色颜料。

There are many industrial applications for coloured pigments that have anti-fading properties. Developing a low-cost, high-volume production method for anti-fading pigments that have low toxicity and minimal environmental impact may support their widespread use. To accomplish this goal, we need to prepare pigments using abundant and environmentally friendly chemical compounds. We demonstrated that the aggregation of fine, submicron silica spherical particles produces various colours. Because the microstructure of this aggregation is isotropic and has short-range order on a length scale comparable to optical wavelengths, angle-independent structural colour caused by wavelength-specific constructive reflection is exhibited. The saturation of colour from this aggregation can be increased by adding a small amount of a conventional black particle. Colourful green pigments can be prepared by combining different sizes of fine submicron silica spherical particles with black particle.