Drying-Induced Hierarchical Dimple Patterns on Partially Miscible Polymeric Films Under Ordered Convections
Drying-Induced Hierarchical Dimple Patterns on Partially Miscible Polymeric Films Under Ordered Convections
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DOI：
10.1080/07373937.2013.783591
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发表时间：
2013-08
影响因子：
3.3
通讯作者：
M. Yamamura;Shintaro Eikai;Y. Mawatari;H. Kage
中科院分区：
文献类型：
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作者：
M. Yamamura;Shintaro Eikai;Y. Mawatari;H. Kage
我们描述了由蒸发诱导的界面应力在聚合物亚层上形成的分层双凹坑图案。由于水蒸气冷凝在部分混溶的挥发性子层上，所产生的不稳定的湿对湿配置触发有序对流下的液滴组装，从而产生六边形痕迹的表面凹坑，其与高度有序的凹坑阵列共存。监测随时间变化的Marangoni数证明，界面应力起着至关重要的作用，在分级和均匀有序的凹坑图案之间的过渡。
We describe the formation of hierarchical dual dimple patterns on polymeric sublayers by evaporation-induced interfacial stress. As water vapor condenses on partially miscible volatile sublayers, the resulting unstable wet-on-wet configurations trigger droplet assembly under ordered convection, giving rise to hexagonal traces of surface dimples, which coexist with highly ordered dimple arrays. Monitoring the time-dependent Marangoni numbers proved that the interfacial stress plays a crucial role in the transition between hierarchically and uniformly ordered dimple patterns.