Bidisperse Nanospheres Jammed on a Liquid Surface
Bidisperse Nanospheres Jammed on a Liquid Surface
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DOI：
10.1021/acsnano.0c04682
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发表时间：
2020-08-25
期刊：
影响因子：
17.1
通讯作者：
Russell, Thomas P.
中科院分区：
文献类型：
--
作者：
Gao, Yige;Kim, Paul Y.;Russell, Thomas P.
在非挥发性液体表面上组装双分散纳米球的堵塞填料，并通过使用原位扫描电子显微镜方法可视化到单颗粒尺度。聚乙二醇化的二氧化硅纳米球，以不同的数量分数和尺寸比混合，具有足够大的面内迁移率之前，堵塞，以形成均匀的单层重现。从收集到的纳米分辨率图像，局部秩序和混合程度进行了评估标准度量。对于等摩尔的混合物，一个大到小的尺寸比约13最小化的相关度量的局部取向和位置的顺序，如先前预测的模拟bidisperse磁盘干扰。尽管单层均匀性，结构和耗尽的相互作用导致类似大小的球体簇，一个功能明显的尺寸比2以上。在许多液体界面技术中寻求高度堆积无序的均匀纳米颗粒单层，这些实验概述了关键的设计原则，支持了关于该主题的广泛的理论/模拟文献。
Jammed packings of bidisperse nanospheres were assembled on a nonvolatile liquid surface and visualized to the single-particle scale by using an in situ scanning electron microscopy method. The PEGylated silica nanospheres, mixed at different number fractions and size ratios, had large enough in-plane mobilities prior to jamming to form uniform monolayers reproducibly. From the collected nanometer-resolution images, local order and degree of mixing were assessed by standard metrics. For equimolar mixtures, a large-to-small size ratio of about 13 minimized correlated metrics for local orientational and positional order, as previously predicted in simulations of bidisperse disk jamming. Despite monolayer uniformity, structural and depletion interactions caused spheres of a similar size to cluster, a feature evident at size ratios above 2. Uniform nanoparticle monolayers of high packing disorder are sought in many liquid interface technologies, and these experiments outlined key design principles, buttressing extensive theory/simulation literature on the topic.