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Lateral Size Scaling Effect during Discontinuous Dewetting
Advanced Materials Interfaces ( IF 4.3 ) Pub Date : 2018-07-04 , DOI: 10.1002/admi.201800729
Yinyin Lin 1 , Zhongsheng Wu 1 , Mengying Zhang 2 , Jinbo Wu 1 , Weijia Wen 3
Affiliation  

Discontinuous dewetting on a prepatterned surface with regions of different dewettability is an attractive way to assemble a material into 2D microstructures with a predefined lateral size and spatial distribution on a surface. However, few studies have examined the aspect ratio or contact angles of the microstructures. In this Communication, it is found that the static contact angle changes with the lateral size of droplets and variation relationship between them shows two phases: an exponential decrease phase when lateral size is <80 µm, and a minimum plateau phase when lateral size is >80 µm, which is defined as lateral size scaling effect. After dynamically studying the droplet generation, it is proposed that liquid retraction after liquid thin film ruptures is responsible for the lateral size scaling effect. The effect of liquid viscosity and sliding speed on the lateral size scaling effect is also assessed and the lateral size scaling effect in droplet evaporation models is investigated. Finally, differently oriented single metal‐organic framework crystal arrays based on the lateral size scaling effect are successfully fabricated. This work demonstrates a novel 2.5D top‐down strategy to guide bottom‐up assembly.

中文翻译:

间断去湿过程中的横向尺寸缩放效应

在具有不同润湿性区域的预图案化表面上进行不连续润湿是将材料组装为二维微结构的一种有吸引力的方式,该二维结构具有预定的横向尺寸和表面上的空间分布。但是,很少有研究检查微结构的纵横比或接触角。在本交流中,发现静态接触角随液滴的横向尺寸而变化,并且液滴之间的变化关系显示出两个阶段:横向尺寸<80 µm时呈指数减小阶段,横向尺寸>>时为最小平稳阶段。 80 µm,定义为横向尺寸缩放效果。在动态研究液滴产生之后,提出在液体薄膜破裂后液体回缩是造成侧向尺寸缩放效应的原因。还评估了液体粘度和滑动速度对横向尺寸缩放效果的影响,并研究了液滴蒸发模型中的横向尺寸缩放效果。最后,成功地制造了基于横向尺寸缩放效应的不同取向的单金属有机骨架晶体阵列。这项工作演示了一种新颖的2.5D自上而下的策略来指导自下而上的组装。
更新日期:2018-07-04
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