Chen Ting-Hui, Huang Shuan-Yu, Huang Syuan-Yi, Lin Jia-De, Huang Bing-Yau, Kuo Chie-Tong
Department of Physics, National Sun Yat-sen University, Kaohsiung 80424, Taiwan.
Department of Optometry, Chung Shan Medical University, Taichung 40201, Taiwan.
Polymers (Basel). 2021 Feb 25;13(5):692. doi: 10.3390/polym13050692.
In this paper, we propose a modified gravity method by introducing centrifugal force to promote the stacking of silica particles and the order of formed colloidal crystals. In this method, a monodispersed silica colloidal solution is filled into empty cells and placed onto rotation arms that are designed to apply an external centrifugal force to the filled silica solution. When sample fabrication is in progress, silica particles are forced toward the edges of the cells. The number of defects in the colloidal crystal decreases and the structural order increases during this process. The highest reflectivity and structural order of a sample was obtained when the external centrifugal force was 18 G. Compared to the samples prepared using the conventional stacking method, samples fabricated with centrifugal force possess higher reflectivity and structural order. The reflectivity increases from 68% to 90%, with an increase in centrifugal force from 0 to 18 G.
在本文中，我们提出了一种改进的重力方法，通过引入离心力来促进二氧化硅颗粒的堆积以及所形成胶体晶体的有序性。在该方法中，将单分散的二氧化硅胶体溶液填充到空的样品池中，并放置在旋转臂上，旋转臂旨在对填充的二氧化硅溶液施加外部离心力。在样品制备过程中，二氧化硅颗粒被推向样品池的边缘。在此过程中，胶体晶体中的缺陷数量减少，结构有序性增加。当外部离心力为18G时，获得了样品的最高反射率和结构有序性。与使用传统堆积方法制备的样品相比，用离心力制备的样品具有更高的反射率和结构有序性。随着离心力从0增加到18G，反射率从68%增加到90%。
