Departments of Chemistry, Biochemistry and Molecular Biology, and Physics, The Pennsylvania State University , University Park, Pennsylvania 16802, United States.
Langmuir. 2017 Oct 3;33(39):10366-10373. doi: 10.1021/acs.langmuir.7b02553. Epub 2017 Sep 19.
Despite intensive research efforts in the synthesis of binary colloidal crystals, the production of well ordered binary colloidal crystal films over large areas continues to be synthetically challenging. In this paper, we investigate the phase behavior of binary mixtures of l-arginine-stabilized 36 and 22 nm silica nanoparticles deposited as centimeter-scale thin films onto a vertical substrate via evaporative assembly. By adjusting the temperature and relative colloid composition under high humidity conditions, we controlled the order of the resultant colloidal crystal films. The domain size of the AB binary crystalline phase increased with an excess of small (B) particles and a very slow evaporation rate below 45 °C, with the best results obtained at 30° and 35 °C.
尽管在二元胶体晶体的合成方面进行了深入的研究，但在大面积上制备具有良好有序性的二元胶体晶体薄膜仍然具有挑战性。在本文中，我们研究了通过蒸发组装将 l-精氨酸稳定的 36nm 和 22nm 二氧化硅纳米粒子以厘米级薄膜的形式沉积到垂直基底上的二元混合物的相行为。通过在高湿度条件下调节温度和相对胶体组成，我们控制了所得胶体晶体薄膜的有序性。AB 二元晶相的畴尺寸随小（B）粒子的过量和低于 45°C 的非常缓慢的蒸发速率而增加，在 30°C 和 35°C 时得到的结果最佳。
