Bidisperse Nanospheres Jammed on a Liquid Surface

被引:10
|
作者
Gao, Yige [1 ]
Kim, Paul Y. [2 ]
Hoagland, David A. [1 ]
Russell, Thomas P. [1 ,2 ,3 ,4 ]
机构
[1] Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA
[2] Lawrence Berkeley Natl Lab, Mat Sci Div, Berkeley, CA 94720 USA
[3] Beijing Univ Chem Technol, Beijing Adv Innovat Ctr Soft Matter Sci & Engn, Beijing 100029, Peoples R China
[4] Tohoku Univ, Adv Inst Mat Res, WPI AIMR, Sendai, Miyagi 9808577, Japan
基金
美国国家科学基金会;
关键词
electron microscopy; condensed matter; interfacial jamming; nanoparticles; ionic liquid; PHASE-SEPARATION; HARD; PACKINGS; DYNAMICS; SPHERES;
D O I
10.1021/acsnano.0c04682
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页码:10589 / 10599
页数:11
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